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Tomoki Nakamura

Section

Graduate School of Science

Job title

Professor

Degree

博士（理学）（東京大学）
理学修士（東京大学）

researchmap

https://researchmap.jp/tomokinakamura1966

J-GLOBAL ID

201101002539455701

Education 2

The University of Tokyo

- 1991
The University of Tokyo　Graduate School, Division of Science

- 1991

Committee Memberships 18

日本惑星科学会　運営委員

2017/01 - Present
宇宙航空研究開発機構キュレーション設備　運営委員

2010/04 - Present
国際隕石学会　学会員

1995/04 - Present
日本地球化学会　学会員

1995/04 - Present
日本惑星科学会　学会員

1995/04 - Present
日本鉱物学会　学会員

1995/04 - Present
国際隕石学会　学会員

1995/04 - Present
日本地球化学会　学会員

1995/04 - Present
日本惑星科学会　学会員

1995/04 - Present
日本鉱物学会　学会員

1995/04 - Present
アメリカ地球化学会　理事

2014/01 - 2016/12
Geochemical Society　Director

2014/01 - 2015/12
質量分析学会　同位体比部会世話人

2005/04 - 2015/03
質量分析学会　同位体比部会世話人

2005/04 - 2015/03
惑星科学会「きたる１０年」　第２段審査委員

2010/04 - 2014/03
惑星科学会「きたる１０年」　第２段審査委員

2010/04 - 2014/03
日本惑星科学会　運営委員

2006/04 - 2009/03
日本惑星科学会　運営委員

2006/04 - 2009/03

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Professional Memberships 4

日本地球化学会
日本鉱物学会
国際隕石学会(The meteoritical Society)
日本惑星科学会

Research Interests 4

solar system exploration
interplanetary dust particles
primitive meteorites
Early solar systen evolution

Research Areas 1

Natural sciences / Space and planetary science /

Awards 2

Excellent Reviewers for 2014

2015/03　Earth, Planets and Space
奨励賞

2000　日本地球化学会

Papers 234

Methylene‐to‐methyl ratio variability in Ryugu samples: Clues to a heterogeneous aqueous alteration

Zélia Dionnet, Zahia Djouadi, Lukas Delaye, Lucas Caron, Rosario Brunetto, Alice Aléon‐Toppani, Cateline Lantz, Stefano Rubino, Donia Baklouti, Tomoki Nakamura, Ferenc Borondics, Christophe Sandt, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Seiichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　60　(2)　273-285　2024/12/24
Publisher: Wiley
DOI： 10.1111/maps.14304 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract Understanding the processes of aqueous alteration within primitive bodies is crucial for unraveling the complex history of early planetesimals. To better identify the signs of this process and its consequences, we have studied the heterogeneity at a micrometric scale of the structure of the aliphatic organic compounds and its relationship to its mineralogical environment. Here, we report an analysis performed on two micrometric grains of Ryugu (C0002‐FC027 and C0002‐FC028). The samples were crushed in a diamond compression cell and analyzed using high‐spatial resolution Fourier Transform InfraRed (FT‐IR) hyperspectral imaging measurements conducted in transmission mode. We showed here the spatial distributions of the main components and the structural heterogeneity of the aliphatic organic matter highlighting a micrometer‐scale variability in the methylene‐to‐methyl ratio. Moreover, we connected this heterogeneity to the one of the phyllosilicate band positions. Our findings indicate that the organic matter within Ryugu's micrometric grains underwent varying degrees of aqueous alteration in distinct microenvironments resulting in an elongation of the length of their aliphatic chains, and/or a reduction in their branching and/or cross‐linking.
Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu

Toshihiro Yoshimura, Daisuke Araoka, Hiroshi Naraoka, Saburo Sakai, Nanako O. Ogawa, Hisayoshi Yurimoto, Mayu Morita, Morihiko Onose, Tetsuya Yokoyama, Martin Bizzarro, Satoru Tanaka, Naohiko Ohkouchi, Toshiki Koga, Jason P. Dworkin, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana, Yoshinori Takano

Nature Communications　15　(1)　2024/09/05
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-024-50814-y 　

eISSN： 2041-1723

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Abstract Returned samples from the carbonaceous asteroid (162173) Ryugu provide pristine information on the original aqueous alteration history of the Solar System. Secondary precipitates, such as carbonates and phyllosilicates, reveal elemental partitioning of the major component ions linked to the primordial brine composition of the asteroid. Here, we report on the elemental partitioning and Mg isotopic composition (²⁵Mg/²⁴Mg) of breunnerite [(Mg, Fe, Mn)CO₃] from the Ryugu C0002 sample and the A0106 and C0107 aggregates by sequential leaching extraction of salts, exchangeable ions, carbonates, and silicates. Breunnerite was the sample most enriched in light Mg isotopes, and the ²⁵Mg/²⁴Mg value of the fluid had shifted lower by ~0.38‰ than the initial value (set to 0‰) before dolomite precipitation. As a simple model, the Mg²⁺ first precipitated in phyllosilicates, followed by dolomite precipitation, at which time ~76−87% of Mg²⁺ had been removed from the primordial brine. A minor amount of phyllosilicate precipitation continued after dolomite precipitation. The element composition profiles of the latest solution that interacted with the cation exchange pool of Ryugu were predominantly Na-rich. Na⁺ acts as a bulk electrolyte and contributes to the stabilization of the negative surface charge of phyllosilicates and organic matter on Ryugu.
Chondrule-like objects and a Ca-Al-rich inclusion from comets or comet-like icy bodies

Takaaki Noguchi, Daisuke Nakashima, Takayuki Ushikubo, Wataru Fujiya, Noriaki Ohashi, John P. Bradley, Tomoki Nakamura, Noriko T. Kita, Peter Hoppe, Hidemi Ishibashi, Makoto Kimura, Naoya Imae

Geochimica et Cosmochimica Acta　381　131-155　2024/09
Publisher: Elsevier BV
DOI： 10.1016/j.gca.2024.07.038 　

ISSN： 0016-7037
Primordial aqueous alteration recorded in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu

Yoshinori Takano, Hiroshi Naraoka, Jason P. Dworkin, Toshiki Koga, Kazunori Sasaki, Hajime Sato, Yasuhiro Oba, Nanako O. Ogawa, Toshihiro Yoshimura, Kenji Hamase, Naohiko Ohkouchi, Eric T. Parker, José C. Aponte, Daniel P. Glavin, Yoshihiro Furukawa, Junken Aoki, Kuniyuki Kano, Shin Ichiro M. Nomura, Francois Regis Orthous-Daunay, Philippe Schmitt-Kopplin, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei Ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana

Nature communications　15　(1)　5708　2024/07/10

DOI： 10.1038/s41467-024-49237-6 　

eISSN： 2041-1723
Raman spectroscopy of Ryugu particles and their extracted residues: Fluorescence background characteristics and similarities to CI chondrites

Mutsumi Komatsu, Hikaru Yabuta, Yoko Kebukawa, Lydie Bonal, Eric Quirico, Timothy J. Fagan, George D. Cody, Jens Barosch, Laure Bejach, Emmanuel Dartois, Alexandre Dazzi, Bradley De Gregorio, Ariane Deniset‐Besseau, Jean Duprat, Cecile Engrand, Minako Hashiguchi, Zita Martins, Jérémie Mathurin, Gilles Montagnac, Smail Mostefaoui, Larry R. Nittler, Takuji Ohigashi, Taiga Okumura, Laurent Rémusat, Scott Sandford, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier‐Paoletti, Shohei Yamashita, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tomohiro Usui, Masanao Abe, Tatsuaki Okada, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　2024/07/04

DOI： 10.1111/maps.14234 　
Three-dimensional textures of Ryugu samples and their implications for the evolution of aqueous alteration in the Ryugu parent body

Akira Tsuchiyama, Megumi Matsumoto, Junya Matsuno, Masahiro Yasutake, Tomoki Nakamura, Takaaki Noguchi, Akira Miyake, Kentaro Uesugi, Akihisa Takeuchi, Shota Okumura, Yuri Fujioka, Mingqi Sun, Aki Takigawa, Toru Matsumoto, Satomi Enju, Itaru Mitsukawa, Yuma Enokido, Tatsuhiko Kawamoto, Takeshi Mikouchi, Tatsuhiro Michikami, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Stefano Rubino, Zelia Dionnet, Alice Aléon-Toppani, Rosario Brunetto, Michael E. Zolensky, Tsukasa Nakano, Naoto Nakano, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Fuyuto Terui, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

Geochimica et Cosmochimica Acta　375　146-172　2024/06
Publisher: Elsevier BV
DOI： 10.1016/j.gca.2024.03.032 　

ISSN： 0016-7037
A comprehensive study of apatite grains in Ryugu rock fragments

B. J. Tkalcec, P. Tack, E. De Pauw, B. Bazi, B. Vekemans, M. Lindner, L. Vincze, M. Di Michiel, J. Garrevoet, G. Falkenberg, T. Nakamura, T. Morita, K. Amano, D. Nakashima, F. Langenhorst, K. Pollok, H. Yurimoto, T. Noguchi, R. Okazaki, H. Yabuta, H. Naraoka, K. Sakamoto, S. Tachibana, T. Yada, M. Nishimura, A. Nakato, A. Miyazaki, K. Yogata, M. Abe, T. Okada, T. Usui, M. Yoshikawa, T. Saiki, S. Tanaka, F. Terui, S. Nakazawa, S. Watanabe, Y. Tsuda, F. E. Brenker

Meteoritics & Planetary Science　59　(8)　2149-2165　2024/05/11
Publisher: Wiley
DOI： 10.1111/maps.14177 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract Apatite is present as an accessory phase in many meteorites and is often formed as a secondary product of aqueous alteration. Its propensity to incorporate rare earth elements (REE) results in apatite usually being the main REE‐bearing phase in hydrously altered meteorites. Asteroid Ryugu is thought to have experienced pervasive aqueous alteration and material collected from the surface of Ryugu is expected to provide insight into asteroidal aqueous alteration processes without influence by terrestrial weathering. Morphologies and mineral associations of apatite grains from five rock fragments collected from the asteroid Ryugu by the Hayabusa2 spacecraft were examined and their REE concentrations were measured by synchrotron X‐ray fluorescence (SXRF) spectroscopy. The main minerals associated with apatite are dolomite, magnetite, and pyrrhotite. Grain boundary corrosion of the interfaces between apatite assemblages and the surrounding matrix suggest that paragenetic formation on the asteroid was followed by a later episode of hydrous alteration. Light REE (LREE) concentration levels recorded at 20–150 times those of bulk CI levels together with a steady increase from LREE toward enrichment of medium REE (MREE, up to Er) at 50–400 times bulk CI levels may suggest postgenetic removal of LREE from Ryugu apatite grains by late‐stage circulation of a hydrothermal fluid.
The Earth atmosphere‐like bulk nitrogen isotope composition obtained by stepwise combustion analyses of Ryugu return samples

Ko Hashizume, Akizumi Ishida, Ayano Chiba, Ryuji Okazaki, Kasumi Yogata, Toru Yada, Fumio Kitajima, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Yoshinori Takano, Kanako Sakamoto, Shogo Tachibana, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Satoshi Tanaka, Satoru Nakazawa, Sei‐ichiro Watanabe, Yuichi Tsuda, Michael W. Broadley, Henner Busemann

Meteoritics & Planetary Science　2024/04/30
Publisher: Wiley
DOI： 10.1111/maps.14175 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract The nitrogen isotope compositions of two samples returned from the asteroid Ryugu were determined using a stepwise combustion method, along with Ivuna (CI) and Y‐980115, a CI‐like Antarctic meteorite, as references. The two Ryugu samples A0105‐07 and C0106‐07 showed bulk δ¹⁵N values of +1.7 ± 0.5‰ and +0.2 ± 0.6‰, respectively, significantly lower than Ivuna with +36.4 ± 0.4‰, but close to Y‐980115 with +4.0 ± 0.3‰. The Ryugu samples are further characterized by C/N and ³⁶Ar/N ratios up to 3.4× and 4.9× the value of Ivuna, respectively. Among all Ryugu samples and CI chondrites, a positive correlation was observed between nitrogen concentrations and δ¹⁵N values, with samples with lower nitrogen concentrations exhibiting lower δ¹⁵N. This trend is explained by a two‐component mixing model. One component is present at a constant abundance among all CI‐related samples, with a δ¹⁵N value around 0‰ or lower. The other varies in abundance between different samples, and exhibits a δ¹⁵N value of +56 ± 4‰. The first ¹⁵N‐poor endmember is seemingly tightly incorporated into a carbonaceous host phase, whereas the ¹⁵N‐rich endmember can be mobilized and decoupled from carbon, potentially because it is in the form of ammonia. Asteroid materials with volatile compositions that are similar to those reported here for the Ryugu samples are attractive candidates for the volatile sources among Earth's building blocks.
Coevolution of phyllosilicate, carbon, sulfide, and apatite in Ryugu's parent body

Zack Gainsforth, Gerardo Dominguez, Kana Amano, Megumi Matsumoto, Yuri Fujioka, Eiichi Kagawa, Tomoki Nakamura, Shogo Tachibana, Tomoyo Morita, Mizuha Kikuiri, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masano Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei‐ichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　59　(8)　2073-2096　2024/04/15
Publisher: Wiley
DOI： 10.1111/maps.14161 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract We analyzed an asteroid Ryugu sample returned to Earth by JAXA's Hayabusa2 mission using nanoIR, SEM, and TEM microscopy. We identified multiple distinct carbon reservoirs within the phyllosilicate matrix and demonstrate infrared spectral affinities for some of the carbon to insoluble organic matter (IOM). TEM studies of Ryugu samples have allowed us to better understand the interrelationship between the crystallographic orientations of phyllosilicates and the secondary minerals such as carbonate, sulfide, and apatite. Transport of elements provides a unifying theme for understanding these interrelationships.
Correlated IR-SEM-TEM studies of three different grains from Ryugu: From the initial material to post-accretional processes

Alice Aléon-Toppani, Rosario Brunetto, Zélia Dionnet, Stefano Rubino, Donia Baklouti, François Brisset, Maxime Vallet, Eva Heripre, Tomoki Nakamura, Cateline Lantz, Zahia Djouadi, Ferenc Borondics, Christophe Sandt, David Troadec, Obadias Mivumbi, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohira Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Geochimica et Cosmochimica Acta　371　1-30　2024/04
Publisher: Elsevier BV
DOI： 10.1016/j.gca.2024.02.006 　

ISSN： 0016-7037
Flyby of asteroid Phaethon: the Sun’s son and the Geminids' mother! (1) - Overview and science of DESTINY PLUS -

Arai T., Kobayashi M., Ishibashi K., Yoshida F., Kimura H., Hirai T., Okamoto T., Hong P. K., Yamada M., Wada K., Senshu H., Akitaya H., Srama R., Krüger H., Marshall S., Sasaki S., Yabuta H., Ishiguro M., Nakamura T., Ohtsuka K., Watanabe J., Ito T., Ootsubo T., Abe S., Sekiguchi T., Urakawa S., Hiroi T., Beniyama J., Morota T., Tachibana S., Mikouchi T., Matsuura S., Ito M., Yamaguchi A., Noguchi T., Nakamura-Messenger K., Komatsu M., Komatsu G., Demura H., Hirata N., Kaneda H., Yanagisawa T., Kurosaki H., Tatsumi E., Yano H., Yoshikawa M., Ozaki N., Yamamoto T., Mochihara Y., Tokudome S., Toyota H., Nishiyama K., Imamura H., Takashima T.

Planetary People - The Japanese Society for Planetary Sciences　33　(1)　34-50　2024/03/25
Publisher: The Japanese Society for Planetary Sciences
DOI： 10.14909/yuseijin.33.1_34 　

ISSN： 0918-273X

eISSN： 2423-897X
Electron microscopy observations of the diversity of Ryugu organic matter and its relationship to minerals at the micro‐ to nano‐scale

Rhonda M. Stroud, Jens Barosch, Lydie Bonal, Katherine Burgess, George D. Cody, Bradley T. De Gregorio, Luke Daly, Emmanuel Dartois, Elena Dobrică, Jean Duprat, Cecile Engrand, Dennis Harries, Minako Hashiguchi, Hope Ishii, Yoko Kebukawa, A. David Kilcoyne, Falko Langenhorst, Martin R. Lee, Larry R. Nittler, Eric Quirico, Taiga Okumura, Laurent Remusat, Scott Sandford, Hikaru Yabuta, Masanao Abe, Neyda M. Abreu, Paul A. J. Bagot, Pierre Beck, Laure Bejach, Phil A. Bland, John C. Bridges, Brittany A. Cymes, Alexandre Dazzi, Francisco de la Peña, Ariane Deniset‐Besseau, Satomi Enju, Yuma Enokido, David R. Frank, Jennifer Gray, Mitsutaka Haruta, Satoshi Hata, Leon Hicks, Yohei Igami, Damien Jacob, Kanami Kamide, Mutsumi Komatsu, Sylvain Laforet, Hugues Leroux, Corentin Le Guillou, Zita Martins, Maya Marinova, James Martinez, Jérémie Mathurin, Megumi Matsumoto, Toru Matsumoto, Junya Matsuno, Samuel McFadzean, Tatsuhiro Michikami, Itaru Mitsukawa, Akira Miyake, Masaaki Miyahara, Akiko Miyazaki, Gilles Montagnac, Smail Mostefaoui, Tomoki Nakamura, Aiko Nakato, Hiroshi Naraoka, Yusuke Nakauchi, Satoru Nakazawa, Masahiro Nishimura, Takaaki Noguchi, Kenta Ohtaki, Takuji Ohigashi, Tatsuaki Okada, Shota Okumura, Ryuji Okazaki, Thi H. V. Phan, Rolando Rebois, Kanako Sakamoto, Takanao Saiki, Hikaru Saito, Yusuke Seto, Miho Shigenaka, William Smith, Hiroki Suga, Mingqi Sun, Shogo Tachibana, Yoshio Takahashi, Yasuo Takeichi, Akihisa Takeuchi, Aki Takigawa, Yusuke Tamenori, Satoshi Tanaka, Fuyuto Terui, Michelle S. Thompson, Naotaka Tomioka, Akira Tsuchiyama, Yuichi Tsuda, Kentaro Uesugi, Masayuki Uesugi, Tomohiro Usui, Maximilien Verdier‐Paoletti, Daisuke Wakabayashi, Sei‐ichiro Watanabe, Toru Yada, Shohei Yamashita, Masahiro Yasutake, Kasumi Yogata, Makoto Yoshikawa, Hisayoshi Yurimoto, Pierre‐M. Zanetta, Thomas Zega, Michael E. Zolensky

Meteoritics & Planetary Science　2024/01/25
Publisher: Wiley
DOI： 10.1111/maps.14128 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract Transmission electron microscopy analyses of Hayabusa2 samples show that Ryugu organic matter exhibits a range of morphologies, elemental compositions, and carbon functional chemistries consistent with those of carbonaceous chondrites that have experienced low‐temperature aqueous alteration. Both nanoglobules and diffuse organic matter are abundant. Non‐globular organic particles are also present, and including some that contain nanodiamond clusters. Diffuse organic matter is finely distributed in and around phyllosilicates, forms coatings on other minerals, and is also preserved in vesicles in secondary minerals such as carbonate and pyrrhotite. The average elemental compositions determined by energy‐dispersive spectroscopy of extracted, demineralized insoluble organic matter samples A0107 and C0106 are C₁₀₀N₃O₉S₁ and C₁₀₀N₃O₇S₁, respectively, with the difference in O/C slightly outside the difference in the standard error of the mean. The functional chemistry of the nanoglobules varies from mostly aromatic C=C to mixtures of aromatic C=C, ketone C=O, aliphatic (CH_n), and carboxyl (COOH) groups. Diffuse organic matter associated with phyllosilicates has variable aromatic C, ketone and carboxyl groups, and some localized aliphatics, but is dominated by molecular carbonate (CO₃) absorption, comparable to prior observations of clay‐bound organic matter in CI meteorites.
Microstructural and chemical features of impact melts on Ryugu particle surfaces: Records of interplanetary dust hit on asteroid Ryugu

Megumi Matsumoto, Junya Matsuno, Akira Tsuchiyama, Tomoki Nakamura, Yuma Enokido, Mizuha Kikuiri, Aiko Nakato, Masahiro Yasutake, Kentaro Uesugi, Akihisa Takeuchi, Satomi Enju, Shota Okumura, Itaru Mitsukawa, Mingqi Sun, Akira Miyake, Mitsutaka Haruta, Yohei Igami, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Michael Zolensky, Toru Yada, Masahiro Nishimura, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Science Advances　10　(3)　2024/01/19
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/sciadv.adi7203 　

eISSN： 2375-2548

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The Hayabusa2 spacecraft delivered samples of the carbonaceous asteroid Ryugu to Earth. Some of the sample particles show evidence of micrometeoroid impacts, which occurred on the asteroid surface. Among those, particles A0067 and A0094 have flat surfaces on which a large number of microcraters and impact melt splashes are observed. Two impact melt splashes and one microcrater were analyzed to unveil the nature of the objects that impacted the asteroid surface. The melt splashes consist mainly of Mg-Fe–rich glassy silicates and Fe-Ni sulfides. The microcrater trapped an impact melt consisting mainly of Mg-Fe–rich glassy silicate, Fe-Ni sulfides, and minor silica-rich glass. These impact melts show a single compositional trend indicating mixing of Ryugu surface materials and impactors having chondritic chemical compositions. The relict impactor in one of the melt splashes shows mineralogical similarity with anhydrous chondritic interplanetary dust particles having a probable cometary origin. The chondritic micrometeoroids probably impacted the Ryugu surface during its residence in a near-Earth orbit.
In situ investigation of an organic micro‐globule and its mineralogical context within a Ryugu “sand” grain

Van T. H. Phan, Pierre Beck, Rolando Rebois, Eric Quirico, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Dennis Harries, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre‐M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Jérémie Mathurin, Alexandre Dazzi, Emmanuel Dartois, Cécile Engrand, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tomohiro Usui, Toru Yada, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamotoa, Peter Hoppe, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　2024/01/08
Publisher: Wiley
DOI： 10.1111/maps.14122 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract The Hayabusa2 mission from the Japan Aerospace Exploration Agency (JAXA) returned to the Earth samples of carbonaceous asteroid (162173) Ryugu. This mission offers a unique opportunity to investigate in the laboratory samples from a C‐type asteroid, without physical or chemical alteration by the terrestrial atmosphere. Here, we report on an investigation of the mineralogy and the organo‐chemistry of Hayabusa2 samples using a combination of micro‐ and nano‐infrared spectroscopy. Particles investigated with conventional FTIR spectroscopy have spectra dominated by phyllosilicate‐related absorption, as observed for samples of CI‐chondrites, selected ungrouped carbonaceous chondrites, and selected hydrated micrometeorites. Ryugu samples show smaller sulfate‐related absorption than CI‐chondrites. Our samples that were only briefly exposed to the Earth atmosphere show absorptions related to molecular water, revealing fast terrestrial contamination of the spectral signature at 3 μm. Overall, our FTIR data are in agreement with other work done on Ryugu samples, revealing a low degree of mineralogical variability across Ryugu samples. AFM‐IR mapping of the grains shows the presence of a micrometer‐sized organic globule in one of our analyzed grains. The AFM‐IR spectra obtained on this globule are similar to IR spectra obtained on IOM suggesting that it is constituted of refractory organic matter. This globule may host silicate in its interior, with a different mineralogy than bulk Ryugu phyllosilicate. The shape, presence of peculiar silicate, and the nature of organic constituting the globule point toward a pre‐accretionary origin of this globule and that at least part of Ryugu organics were inherited from the protosolar nebulae or the interstellar media. Altogether, our results show the similarities between Ryugu samples and CI chondrites.
Four‐dimensional‐STEM analysis of the phyllosilicate‐rich matrix of Ryugu samples

Bahae‐eddine Mouloud, Damien Jacob, Francisco de la Peña, Maya Marinova, Corentin Le Guillou, Jean‐Christophe Viennet, Sylvain Laforet, Hugues Leroux, Adrien Teurtrie, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrica, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre‐M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tomohiro Usui, Toru Yada, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamotoa, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　2024/01/05
Publisher: Wiley
DOI： 10.1111/maps.14124 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract Ryugu asteroid grains brought back to the Earth by the Hayabusa2 space mission are pristine samples containing hydrated minerals and organic compounds. Here, we investigate the mineralogy of their phyllosilicate‐rich matrix with four‐dimensional scanning transmission electron microscopy (4D‐STEM). We have identified and mapped the mineral phases at the nanometer scale (serpentine, smectite, pyrrhotite), observed the presence of Ni‐bearing pyrrhotite, and identified the serpentine polymorph as lizardite, in agreement with the reported aqueous alteration history of Ryugu. Furthermore, we have mapped the d‐spacings of smectite and observed a broad distribution of values, ranging from 1 to 2 nm, with an average d‐spacing of 1.24 nm, indicating significant heterogeneity within the sample. Such d‐spacing variability could be the result of either the presence of organic matter trapped in the interlayers or the influence of various geochemical conditions at the submicrometer scale, suggestive of a range of organic compounds and/or changes in smectite crystal chemistry.
Incipient space weathering on asteroid 162173 Ryugu recorded by pyrrhotite

Dennis Harries, Toru Matsumoto, Falko Langenhorst, Takaaki Noguchi, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hikaru Saito, Satoshi Hata, Aki Takigawa, Yusuke Nakauchi, Shogo Tachibana, Tomoki Nakamura, Megumi Matsumoto, Hope A. Ishii, John P. Bradley, Kenta Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Bahae eddine Mouloud, Maya Marinova, Pierre Beck, Van T.H. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Tatsuhiro Michikami, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei ichiro Watanabe, Yuichi Tsuda

Meteoritics and Planetary Science　2024

DOI： 10.1111/maps.14176 　

ISSN： 1086-9379
Quantification of bulk elemental composition for C-type asteroid Ryugu samples with nondestructive elemental analysis using muon beam

Kazuhiko Ninomiya, Takahito Osawa, Kentaro Terada, Taiga Wada, Shunsaku Nagasawa, I. Haun Chiu, Tomoki Nakamura, Tadayuki Takahashi, Yasuhiro Miyake, M. Kenya Kubo, Soshi Takeshita, Akihiro Taniguchi, Izumi Umegaki, Shin Watanabe, Toshiyuki Azuma, Miho Katsuragawa, Takahiro Minami, Kazumi Mizumoto, Koichiro Shimomura, Shin'ichiro Takeda, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Yoshihiro Furukawa, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei ichiro Watanabe, Yuichi Tsuda

Meteoritics and Planetary Science　2024

DOI： 10.1111/maps.14135 　

ISSN： 1086-9379
Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium

Sarah S. Zeichner, José C. Aponte, Surjyendu Bhattacharjee, Guannan Dong, Amy E. Hofmann, Jason P. Dworkin, Daniel P. Glavin, Jamie E. Elsila, Heather V. Graham, Hiroshi Naraoka, Yoshinori Takano, Shogo Tachibana, Allison T. Karp, Kliti Grice, Alex I. Holman, Katherine H. Freeman, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Kenji Hamase, Kazuhiko Fukushima, Dan Aoki, Minako Hashiguchi, Hajime Mita, Yoshito Chikaraishi, Naohiko Ohkouchi, Nanako O. Ogawa, Saburo Sakai, Eric T. Parker, Hannah L. McLain, Francois-Regis Orthous-Daunay, Véronique Vuitton, Cédric Wolters, Philippe Schmitt-Kopplin, Norbert Hertkorn, Roland Thissen, Alexander Ruf, Junko Isa, Yasuhiro Oba, Toshiki Koga, Toshihiro Yoshimura, Daisuke Araoka, Haruna Sugahara, Aogu Furusho, Yoshihiro Furukawa, Junken Aoki, Kuniyuki Kano, Shin-ichiro M. Nomura, Kazunori Sasaki, Hajime Sato, Takaaki Yoshikawa, Satoru Tanaka, Mayu Morita, Morihiko Onose, Fumie Kabashima, Kosuke Fujishima, Tomoya Yamazaki, Yuki Kimura, John M. Eiler

Science　382　(6677)　1411-1416　2023/12/22
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/science.adg6304 　

ISSN： 0036-8075

eISSN： 1095-9203

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Polycyclic aromatic hydrocarbons (PAHs) contain ≲20% of the carbon in the interstellar medium. They are potentially produced in circumstellar environments (at temperatures ≳1000 kelvin), by (~10 kelvin) interstellar clouds, or by processing of carbon-rich dust grains. We report isotopic properties of PAHs extracted from samples of the asteroid Ryugu and the meteorite Murchison. The doubly- ¹³ C substituted compositions (Δ2× ¹³ C values) of the PAHs naphthalene, fluoranthene, and pyrene are 9 to 51‰ higher than values expected for a stochastic distribution of isotopes. The Δ2× ¹³ C values are higher than expected if the PAHs formed in a circumstellar environment, but consistent with formation in the interstellar medium. By contrast, the PAHs phenanthrene and anthracene in Ryugu samples have Δ2× ¹³ C values consistent with formation by higher-temperature reactions.
Reassigning CI chondrite parent bodies based on reflectance spectroscopy of samples from carbonaceous asteroid Ryugu and meteorites

Kana Amano, Moe Matsuoka, Tomoki Nakamura, Eiichi Kagawa, Yuri Fujioka, Sandra M. Potin, Takahiro Hiroi, Eri Tatsumi, Ralph E. Milliken, Eric Quirico, Pierre Beck, Rosario Brunetto, Masayuki Uesugi, Yoshio Takahashi, Takahiro Kawai, Shohei Yamashita, Yuma Enokido, Taiga Wada, Yoshihiro Furukawa, Michael E. Zolensky, Driss Takir, Deborah L. Domingue, Camilo Jaramillo-Correa, Faith Vilas, Amanda R. Hendrix, Mizuha Kikuiri, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Science Advances　9　(49)　2023/12/08
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/sciadv.adi3789 　

eISSN： 2375-2548

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The carbonaceous asteroid Ryugu has been explored by the Hayabusa2 spacecraft to elucidate the actual nature of hydrous asteroids. Laboratory analyses revealed that the samples from Ryugu are comparable to unheated CI carbonaceous chondrites; however, reflectance spectra of Ryugu samples and CIs do not coincide. Here, we demonstrate that Ryugu sample spectra are reproduced by heating Orgueil CI chondrite at 300°C under reducing conditions, which caused dehydration of terrestrial weathering products and reduction of iron in phyllosilicates. Terrestrial weathering of CIs accounts for the spectral differences between Ryugu sample and CIs, which is more severe than space weathering that likely explains those between asteroid Ryugu and the collected samples. Previous assignments of CI chondrite parent bodies, i.e., chemically most primitive objects in the solar system, are based on the spectra of CI chondrites. This study indicates that actual spectra of CI parent bodies are much darker and flatter at ultraviolet to visible wavelengths than the spectra of CI chondrites.
Evidence of global space weathering by solar wind on asteroid 162173 Ryugu

T. Hiroi, R.E. Milliken, K.M. Robertson, C.D. Schultz, K. Amano, T. Nakamura, H. Yurimoto, T. Noguchi, R. Okazaki, H. Naraoka, H. Yabuta, K. Sakamoto, T. Yada, M. Nishimura, A. Nakato, A. Miyazaki, K. Yogata, M. Abe, T. Okada, T. Usui, M. Yoshikawa, T. Saiki, S. Tanaka, S. Nakazawa, Y. Yokota, E. Tatsumi, Y. Tsuda, S. Tachibana, T. Fuyuto, S. Watanabe, S. Sasaki, H. Kaiden, K. Kitazato, M. Matsuoka

Icarus　406　115755-115755　2023/12
Publisher: Elsevier BV
DOI： 10.1016/j.icarus.2023.115755 　

ISSN： 0019-1035
PAHs, hydrocarbons, and dimethylsulfides in Asteroid Ryugu samples A0106 and C0107 and the Orgueil (CI1) meteorite Peer-reviewed

José C. Aponte, Jason P. Dworkin, Daniel P. Glavin, Jamie E. Elsila, Eric T. Parker, Hannah L. McLain, Hiroshi Naraoka, Ryuji Okazaki, Yoshinori Takano, Shogo Tachibana, Guannan Dong, Sarah S. Zeichner, John M. Eiler, Hisayoshi Yurimoto, Tomoki Nakamura, Hikaru Yabuta, Fuyuto Terui, Takaaki Noguchi, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Yuichi Tsuda, Sei ichiro Watanabe

Earth, Planets and Space　75　(1)　2023/12

DOI： 10.1186/s40623-022-01758-4 　

ISSN： 1343-8832

eISSN： 1880-5981
Influx of nitrogen-rich material from the outer Solar System indicated by iron nitride in Ryugu samples

Toru Matsumoto, Takaaki Noguchi, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hikaru Saito, Satoshi Hata, Dennis Harries, Aki Takigawa, Yusuke Nakauchi, Shogo Tachibana, Tomoki Nakamura, Megumi Matsumoto, Hope A. Ishii, John P. Bradley, Kenta Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Pierre Beck, Thi H. V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre-M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Tatsuhiro Michikami, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Nature Astronomy　2023/11/30
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41550-023-02137-z 　

eISSN： 2397-3366

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Abstract Large amounts of nitrogen compounds, such as ammonium salts, may be stored in icy bodies and comets, but the transport of these nitrogen-bearing solids into the near-Earth region is not well understood. Here, we report the discovery of iron nitride on magnetite grains from the surface of the near-Earth C-type carbonaceous asteroid Ryugu, suggesting inorganic nitrogen fixation. Micrometeoroid impacts and solar wind irradiation may have caused the selective loss of volatile species from major iron-bearing minerals to form the metallic iron. Iron nitride is a product of nitridation of the iron metal by impacts of micrometeoroids that have higher nitrogen contents than the CI chondrites. The impactors are probably primitive materials with origins in the nitrogen-rich reservoirs in the outer Solar System. Our observation implies that the amount of nitrogen available for planetary formation and prebiotic reactions in the inner Solar System is greater than previously recognized.
Mineralogy and petrology of fine‐grained samples recovered from the asteroid (162173) Ryugu

Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Bahae‐Eddine Mouloud, Maya Marinova, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre‐M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, William A. Smith, Sam McFadzean, Pierre‐Etienne Martin, Paul A. J. Bagot, Dennis Fougerouse, David W. Saxey, Steven Reddy, William D. A. Rickard, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tomohiro Usui, Toru Yada, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamotoa, Peter Hoppe, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　2023/11/22
Publisher: Wiley
DOI： 10.1111/maps.14093 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract Samples returned from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 mission revealed that Ryugu is composed of materials consistent with CI chondrites and some types of space weathering. We report detailed mineralogy of the fine‐grained Ryugu samples allocated to our “Sand” team and report additional space weathering features found on the grains. The dominant mineralogy is composed of a fine‐grained mixture of Mg‐rich saponite and serpentine, magnetite, pyrrhotite, pentlandite, dolomite, and Fe‐bearing magnesite. These grains have mineralogy comparable to that of CI chondrites, showing severe aqueous alteration but lacking ferrihydrite and sulfate. These results are similar to previous works on large Ryugu grains. In addition to the major minerals, we also find many minerals that are rare or have not been reported among CI chondrites. Accessory minerals identified are hydroxyapatite, Mg‐Na phosphate, olivine, low‐Ca pyroxene, Mg‐Al spinel, chromite, manganochromite, eskolaite, ilmenite, cubanite, polydymite, transjordanite, schreibersite, calcite, moissanite, and poorly crystalline phyllosilicate. We also show scanning transmission electron microscope and scanning electron microscope compositional maps and images of some space‐weathered grains and severely heated and melted grains. Although our mineralogical results are consistent with that of millimeter‐sized grains, the fine‐grained fraction is best suited to investigate impact‐induced space weathering.
The iron oxidation state of Ryugu samples

Mathieu Roskosz, Pierre Beck, Jean‐Christophe Viennet, Tomoki Nakamura, Barbara Lavina, Michael Y. Hu, Jiyong Zhao, Esen E. Alp, Yoshio Takahashi, Tomoyo Morita, Kana Amano, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei‐Ichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　2023/11/20
Publisher: Wiley
DOI： 10.1111/maps.14098 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract The Hayabusa2 mission sampled Ryugu, an asteroid that did not suffer extensive thermal metamorphism, and returned rocks to the Earth with no significant air exposure. It therefore offers a unique opportunity to study the redox state of carbonaceous Cb‐type asteroids and evaluate the overall redox state of the most primitive rocks of the solar system. An analytical framework was developed to investigate the iron mineralogy and valence state in extraterrestrial material at the micron scale by combining x‐ray diffraction, conventional Mössbauer (MS), and nuclear forward scattering (NFS) spectroscopies. An array of standard minerals was analyzed and cross‐calibrated between MS and NFS. Then, MS and NFS spectra on three Ryugu grains were collected at the bulk and the micron scales. In Ryugu samples, iron is essentially accommodated in magnetite, clay minerals (serpentine–smectite), and sulfides. Only a single set of Mössbauer parameters was necessary to account for the entire variability observed in MS and NFS spectra, at all spatial scales investigated. These parameters therefore make up a fully consistent iron mineralogical model for the Ryugu samples. As far as MS and NFS spectroscopies are concerned, Ryugu grains are overall similar to each other and share most of their mineralogical features with CI‐type chondrites. In detail however, no ferrihydrite is found in Ryugu particles even at the very sensitive scale of Mössbauer spectroscopy. The typical Fe³⁺/Fe_tot of clay minerals is much lower than typical redox ratios measured in CI chondrites (Fe³⁺/Fe_tot = 85%–90%). Furthermore, magnetite from Ryugu is stoichiometric with no significant maghemite component, whereas up to 12% of maghemite was previously identified in the Orgueil's so‐called magnetite. These differences suggest that most CI meteorites suffered terrestrial alteration and that the preterrestrial composition of these carbon‐rich samples was less oxidized than previously measured. However, it is not clear yet whether or not the parent bodies of CI chondrites were as reduced as Ryugu. Finally, the high spatial resolution of NFS allows to disentangle the redox state and the crystal chemistry of iron accommodated in serpentine and smectite. The most likely polytype of serpentine is lizardite, containing <35% of Fe³⁺, a fraction of which being tetrahedrally coordinated. Smectite is more oxidized (Fe³⁺/Fe_tot > 65%) and mainly contains octahedral ferric iron. This finding implies that these clays formed from highly alkaline fluids and the spatial variability highlighted here may suggest a temporal evolution or a spatial variability of the nature of this fluid.
Phyllosilicates with embedded Fe‐based nanophases in Ryugu and Orgueil

Hugues Leroux, Corentin Le Guillou, Maya Marinova, Sylvain Laforet, Jean‐Christophe Viennet, Bahae‐Eddine Mouloud, Adrien Teurtrie, Francisco de la Peña, Damien Jacob, Daniel Hallatt, Mario Pelaez Fernandez, David Troadec, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrică, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre‐M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tomohiro Usui, Toru Yada, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamotoa, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei‐Ichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　2023/11/14
Publisher: Wiley
DOI： 10.1111/maps.14101 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract Samples were recently collected from the carbonaceous asteroid (162173) Ryugu, by the Japan Aerospace Exploration Agency (JAXA) Hayabusa2 mission. They resemble CI chondrites material, thus showing clear evidence of extensive aqueous alteration attested by the widespread presence of a mixture of serpentine and saponite. We present here a scanning transmission electron microscopy study of the Ryugu dominant lithology of the phyllosilicate matrix at the nanometer scale, which we compare with that of the Orgueil CI chondrite. In both objects, the phyllosilicates are of comparable nature and texture, consisting of a mixture of small‐sized crystallites of serpentine and saponite. At the micrometer scale or less, the texture is an alternation of fine and coarse domains. The fine‐grained regions are dominated by saponite. In Ryugu, they enclose numerous Fe,Ni nanosulfides, whereas in Orgueil, S‐ and Ni‐rich ferrihydrite is abundant. The coarse‐grained regions contain more serpentine and no or little Fe,Ni sulfides or ferrihydrite. Scanning transmission x‐ray microscopy at the Fe‐L₃ edge also reveals that iron valency of phyllosilicates is higher and more homogeneous in Orgueil (~70% Fe³⁺) than in Ryugu (<50% Fe³⁺). We interpret the observed textures as being mostly a consequence of aqueous alteration, likely resulting from the replacement by phyllosilicates of submicrometric components, initially agglomerated by a primary accretion. The fine‐grained domains may result from the replacement of GEMS (GEMS—glass with embedded metal and sulfides) objects or from other types of nanometric assemblages of silicate and Fe‐based nanophases. On the other hand, the coarse‐grained regions may correspond to the replacement of anhydrous crystalline silicates of the olivine and pyroxene type. The major difference is the presence of Fe,Ni sulfides in Ryugu and of ferrihydrite and higher iron valency of phyllosilicates in Orgueil. This might be due to long‐term terrestrial weathering that would have destabilized the nanosulfides. We also explore an alternative scenario involving more oxidizing hydrothermal conditions on the Orgueil parent body.
Compositional heterogeneity of insoluble organic matter extracted from asteroid Ryugu samples

Eric Quirico, Lydie Bonal, Yoko Kebukawa, Kana Amano, Hikaru Yabuta, Van T. H. Phan, Pierre Beck, Laurent Rémusat, Emmanuel Dartois, Cecile Engrand, Zita Martins, Laure Bejach, Alexandre Dazzi, Ariane Deniset‐Besseau, Jean Duprat, Jérémie Mathurin, Gilles Montagnac, Jens Barosch, George D. Cody, Bradley De Gregorio, Yuma Enokido, Minako Hashiguchi, Kanami Kamide, David Kilcoyne, Mutsumi Komatsu, Megumi Matsumoto, Smail Mostefaoui, Larry Nittler, Takuji Ohigashi, Taiga Okumura, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier‐Paoletti, Daisuke Wakabayashi, Shohei Yamashita, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Hisayoshi Yurimoto, Kanako Sakamoto, Shogo Tachibana, Sei‐Ichiro Watanabe, Yuichi Tsuda, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohitro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa

Meteoritics & Planetary Science　2023/11/13
Publisher: Wiley
DOI： 10.1111/maps.14097 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract We report a Fourier transform infrared analysis of functional groups in insoluble organic matter (IOM) extracted from a series of 100–500 μm Ryugu grains collected during the two touchdowns of February 22 and July 11, 2019. IOM extracted from most of the samples is very similar to IOM in primitive CI, CM, and CR chondrites, and shows that the extent of thermal metamorphism in Ryugu regolith was, at best, very limited. One sample displays chemical signatures consistent with a very mild heating, likely due to asteroidal collision impacts. We also report a lower carbonyl abundance in Ryugu IOM samples compared to primitive chondrites, which could reflect the accretion of a less oxygenated precursor by Ryugu. The possible effects of hydrothermal alteration and terrestrial weathering are also discussed. Last, no firm conclusions could be drawn on the origin of the soluble outlier phases, observed along with IOM in this study and in the preliminary analysis of Ryugu samples. However, it is clear that the HF/HCl residues presented in this publication are a mix between IOM and the nitrogen‐rich outlier phase.
Soluble organic matter Molecular atlas of Ryugu reveals cold hydrothermalism on C-type asteroid parent body

Philippe Schmitt-Kopplin, Norbert Hertkorn, Mourad Harir, Franco Moritz, Marianna Lucio, Lydie Bonal, Eric Quirico, Yoshinori Takano, Jason P. Dworkin, Hiroshi Naraoka, Shogo Tachibana, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hisayoshi Yurimoto, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tatsuaki Okada, Sei-ichiro Watanabe, Yuichi Tsuda, Kenji Hamase, Aogu Furusho, Minako Hashiguchi, Kazuhiko Fukushima, Dan Aoki, José C. Aponte, Eric T. Parker, Daniel P. Glavin, Hannah L. McLain, Jamie E. Elsila, Heather V. Graham, John M. Eiler, Alexander Ruf, Francois-Regis Orthous-Daunay, Junko Isa, Véronique Vuitton, Roland Thissen, Nanako O. Ogawa, Saburo Sakai, Toshihiro Yoshimura, Toshiki Koga, Haruna Sugahara, Naohiko Ohkouchi, Hajime Mita, Yoshihiro Furukawa, Yasuhiro Oba

Nature Communications　14　(1)　2023/10/16
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-023-42075-y 　

eISSN： 2041-1723

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Abstract The sample from the near-Earth carbonaceous asteroid (162173) Ryugu is analyzed in the context of carbonaceous meteorites soluble organic matter. The analysis of soluble molecules of samples collected by the Hayabusa2 spacecraft shines light on an extremely high molecular diversity on the C-type asteroid. Sequential solvent extracts of increasing polarity of Ryugu samples are analyzed using mass spectrometry with complementary ionization methods and structural information confirmed by nuclear magnetic resonance spectroscopy. Here we show a continuum in the molecular size and polarity, and no organomagnesium molecules are detected, reflecting a low temperature and water-rich environment on the parent body approving earlier mineralogical and chemical data. High abundance of sulfidic and nitrogen rich compounds as well as high abundance of ammonium ions confirm the water processing. Polycyclic aromatic hydrocarbons are also detected in a structural continuum of carbon saturations and oxidations, implying multiple origins of the observed organic complexity, thus involving generic processes such as earlier carbonization and serpentinization with successive low temperature aqueous alteration.
The thermal history of Ryugu based on Raman characterization of Hayabusa2 samples Peer-reviewed

Lydie Bonal, Eric Quirico, Gilles Montagnac, Mutsumi Komatsu, Yoko Kebukawa, Hikaru Yabuta, Kana Amano, Jens Barosch, Laure Bejach, George D. Cody, Emmanuel Dartois, Alexandre Dazzi, Bradley De Gregorio, Ariane Deniset-Besseau, Jean Duprat, Cécile Engrand, Minako Hashiguchi, Kanami Kamide, David Kilcoyne, Zita Martins, Jérémie Mathurin, Smail Mostefaoui, Larry Nittler, Takuji Ohigashi, Taiga Okumura, Laurent Remusat, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Shohei Yamashita, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Hisayoshi Yurimoto, Shogo Tachibana, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Kanako Sakamoto, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makota Yoshikawa

Icarus　408　115826-115826　2023/10
Publisher: Elsevier BV
DOI： 10.1016/j.icarus.2023.115826 　

ISSN： 0019-1035
Space weathering acts strongly on the uppermost surface of Ryugu

Moe Matsuoka, Ei-ichi Kagawa, Kana Amano, Tomoki Nakamura, Eri Tatsumi, Takahito Osawa, Takahiro Hiroi, Ralph Milliken, Deborah Domingue, Driss Takir, Rosario Brunetto, Antonella Barucci, Kohei Kitazato, Seiji Sugita, Yuri Fujioka, Osamu Sasaki, Shiho Kobayashi, Takahiro Iwata, Tomokatsu Morota, Yasuhiro Yokota, Toru Kouyama, Rie Honda, Shingo Kameda, Yuichiro Cho, Kazuo Yoshioka, Hirotaka Sawada, Masahiko Hayakawa, Naoya Sakatani, Manabu Yamada, Hidehiko Suzuki, Chikatoshi Honda, Kazunori Ogawa, Kei Shirai, Cateline Lantz, Stefano Rubino, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Communications Earth & Environment　4　(1)　2023/09/27
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s43247-023-00991-3 　

eISSN： 2662-4435

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Abstract Returned samples from Cb-type asteroid (162173) Ryugu exhibit very dark spectra in visible and near-infrared ranges, generally consistent with the Hayabusa2 observations. A critical difference is that a structural water absorption of hydrous silicates is around twice as deep in the returned samples compared with those of Ryugu’s surface, suggesting Ryugu surface is more dehydrated. Here we use laboratory experiments data to indicate the spectral differences between returned samples and asteroid surface are best explained if Ryugu surface has (1) higher porosity, (2) larger particle size, and (3) more space-weathered condition, with the last being the most effective. On Ryugu, space weathering by micrometeoroid bombardments promoting dehydration seem to be more effective than that by solar-wind implantation. Extremely homogeneous spectra of the Ryugu’s global surface is in contrast with the heterogeneous S-type asteroid (25143) Itokawa’s spectra, which suggests space weathering has proceeded more rapidly on Cb-type asteroids than S-type asteroids.
Phoenix "Hayabusa": A tale of the future (30) - Scientific results from the Ryugu "Stone" analysis team -

Nakamura T., Amano K., Matsuoka M., Kurosawa K., Ninomiya K., Osawa T., Kimura Y., Genda H., Tanaka S., Initial analysis Stone team

Planetary People - The Japanese Society for Planetary Sciences　32　(3)　226-235　2023/09/25
Publisher: The Japanese Society for Planetary Sciences
DOI： 10.14909/yuseijin.32.3_226 　

ISSN： 0918-273X

eISSN： 2423-897X
<scp>Three‐dimensional</scp> multiscale assembly of phyllosilicates, organics, and carbonates in small Ryugu fragments

Zelia Dionnet, Stefano Rubino, Alice Aléon‐Toppani, Rosario Brunetto, Akira Tsuchiyama, Cateline Lantz, Zahia Djouadi, Donia Baklouti, Tomoki Nakamura, Ferenc Borondics, Christophe Sandt, Eva Heripre, David Troadec, Obadias Mivumbi, Jérome Aléon, Theo Ternier, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Seiichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　2023/09/02
Publisher: Wiley
DOI： 10.1111/maps.14068 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract We report μm‐scale nondestructive infrared (IR) hyperspectral results (IR computed tomography, IR‐CT) in 3‐D and IR surface imaging, IR‐S) in 2‐D, at SOLEIL) combined with X‐ray nano‐computed tomography analyses (at SPring‐8) performed on eight small Ryugu fragments extracted from mm‐sized grains coming both from touchdown first and second sites. We describe the multiscale assembly of phyllosilicates, carbonates, sulfides, oxides, and organics. Two types of silicates, as well as diverse kinds of organic matter, were detected inside Ryugu material. Their spatial correlations are described to discuss the role of the mineralogical microenvironments in the formation/evolution of organic matter. In particular, we have shown that there is a redistribution of the organic matter diffuse component during aqueous alteration on the parent body, with a preferential circulation among fine‐grained phyllosilicates.
Chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 Ryugu

Toshihiro Yoshimura, Yoshinori Takano, Hiroshi Naraoka, Toshiki Koga, Daisuke Araoka, Nanako O. Ogawa, Philippe Schmitt-Kopplin, Norbert Hertkorn, Yasuhiro Oba, Jason P. Dworkin, Jose C. Aponte, Takaaki Yoshikawa, Satoru Tanaka, Naohiko Ohkouchi, Minako Hashiguchi, Hannah Mclain, Eric T. Parker, Saburo Sakai, Mihoko Yamaguchi, Takahiro Suzuki, Tetsuya Yokoyama, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana, Kenji Hamase, Aogu Furusho, Kazuhiko Fukushima, Dan Aoki, Daniel P. Glavin, Hannah L. Mclain, Jamie E. Elsila, Heather V. Graham, John M. Eiler, Alexander Ruf, Francois-Regis Orthous-Daunay, Cedric Wolters, Junko Isa, Mayu Morita, Veronique Vuitton, Roland Thissen, Shin-ichiro M. Nomura, Haruna Sugahara, Hajime Mita, Yoshihiro Furukawa, Yoshito Chikaraishi, Morihiko Onose, Fumie Kabashima, Kosuke Fujishima, Hajime Sato, Kazunori Sasaki, Kuniyuki Kano, Junken Aoki, Tomoya Yamazaki, Yuki Kimura

NATURE COMMUNICATIONS　14　(1)　2023/09

DOI： 10.1038/s41467-023-40871-0 　

eISSN： 2041-1723
Visualization of nanoscale magnetic domain states in the asteroid Ryugu

Yuki Kimura, Takeharu Kato, Toshiaki Tanigaki, Tetsuya Akashi, Hiroto Kasai, Satoshi Anada, Ryuji Yoshida, Kazuo Yamamoto, Tomoki Nakamura, Masahiko Sato, Kana Amano, Mizuha Kikuiri, Tomoyo Morita, Eiichi Kagawa, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Sei-ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana

Scientific Reports　13　(1)　2023/08/29
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-023-41242-x 　

eISSN： 2045-2322

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Abstract In the samples collected from the asteroid Ryugu, magnetite displays natural remanent magnetization due to nebular magnetic field, whereas contemporaneously grown iron sulfide does not display stable remanent magnetization. To clarify this counterintuitive feature, we observed their nanoscale magnetic domain structures using electron holography and found that framboidal magnetites have an external magnetic field of 300 A m⁻¹, similar to the bulk value, and its magnetic stability was enhanced by interactions with neighboring magnetites, permitting a disk magnetic field to be recorded. Micrometer-sized pyrrhotite showed a multidomain magnetic structure that was unable to retain natural remanent magnetization over a long time due to short relaxation time of magnetic-domain-wall movement, whereas submicron-sized sulfides formed a nonmagnetic phase. These results show that both magnetite and sulfide could have formed simultaneously during the aqueous alteration in the parent body of the asteroid Ryugu.
Infrared absorption spectra from organic matter in the asteroid Ryugu samples: Some unique properties compared to unheated carbonaceous chondrites Peer-reviewed

Yoko Kebukawa, Eric Quirico, Emmanuel Dartois, Hikaru Yabuta, Laure Bejach, Lydie Bonal, Alexandre Dazzi, Ariane Deniset‐Besseau, Jean Duprat, Cecile Engrand, Jérémie Mathurin, Jens Barosch, George D. Cody, Bradley De Gregorio, Minako Hashiguchi, Kanami Kamide, David Kilcoyne, Mutsumi Komatsu, Zita Martins, Gilles Montagnac, Smail Mostefaoui, Larry R. Nittler, Takuji Ohigashi, Taiga Okumura, Laurent Remusat, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier‐Paoletti, Daisuke Wakabayashi, Shohei Yamashita, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei‐ichiro Watanabe, Yuichi Tsuda

Meteoritics & Planetary Science　2023/08/19
Publisher: Wiley
DOI： 10.1111/maps.14064 　

ISSN： 1086-9379

eISSN： 1945-5100

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Abstract The infrared spectral characteristics of organic‐rich acid residues prepared from Ryugu samples returned by the JAXA Hayabusa2 mission generally match those from unheated carbonaceous chondrite meteorites, but the residues from Ryugu are richer in methyl and methylene functional groups and have higher CH₂/CH₃ ratios. Moreover, two distinct outlier carbonaceous phases are found; one with spectral characteristics of N‐H functional groups, likely amides, and a second phase containing less nitrogen. Such infrared characteristics of Ryugu organic matter might indicate the pristine nature of the freshly collected samples and reflect the near‐surface chemistry in the parent asteroid.
Ryugu’s Anhydrous Ingredients and Their Spectral Link to Primitive Dust from the Outer Solar System

R. Brunetto, C. Lantz, Y. Fukuda, A. Aléon-Toppani, T. Nakamura, Z. Dionnet, D. Baklouti, F. Borondics, Z. Djouadi, S. Rubino, K. Amano, M. Matsumoto, Y. Fujioka, T. Morita, M. Kukuiri, E. Kagawa, M. Matsuoka, R. Milliken, H. Yurimoto, T. Noguchi, R. Okazaki, H. Yabuta, H. Naraoka, K. Sakamoto, S. Tachibana, T. Yada, M. Nishimura, A. Nakato, A. Miyazaki, K. Yogata, M. Abe, T. Okada, T. Usui, M. Yoshikawa, T. Saiki, S. Tanaka, F. Terui, S. Nakazawa, S. Watanabe, Y. Tsuda

Astrophysical Journal Letters　951　(2)　2023/07/01

DOI： 10.3847/2041-8213/acdf5c 　

ISSN： 2041-8205

eISSN： 2041-8213
Elastic Property of Returned Samples From Asteroid (162173) Ryugu

Keisuke Onodera, Yuta Ino, Satoshi Tanaka, Taichi Kawamura, Rei Kanemaru, Takuya Ishizaki, Ryota Fukai, Takeshi Tsuji, Tomoki Nakamura, Daisuke Nakashima, Masayuki Uesugi, Shogo Tachibana, Seiji Sugita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoru Nakazawa, Fuyuto Terui, Sei-ichiro Watanabe, Yuichi Tsuda

2023/05/25
Publisher: Authorea, Inc.
DOI： 10.22541/essoar.168500248.80647094/v1 　

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The elastic property of asteroids is one of the paramount parameters forunderstanding their physical nature. For example, the rigidity enablesus to discuss the asteroid’s shape and surface features such as cratersand boulders, leading to a better understanding of geomorphological andgeological features on small celestial bodies. The sound velocity allowsus to construct an equation of state that is the most fundamental stepto simulate the formation of small bodies numerically. Moreover, seismicwave velocities and attenuation factors are useful to account forresurfacing caused by impact-induced seismic shaking. The elasticproperty of asteroids thus plays an important role in elucidating theasteroid’s evolution and current geological processes. The Hayabusa2spacecraft brought back the rock samples from C-type asteroid (162173)Ryugu in December 2020. As a part of the initial analysis of returnedsamples, we measured the seismic wave velocity of the Ryugu samplesusing the pulse transmission method. We found that P- and S-wavevelocities of the Ryugu samples were about 2.1 km/s and 1.2 km/s,respectively. We also estimated Young’s modulus of 6.0 – 8.0 GPa. Acomparison of the derived parameters with those of carbonaceouschondrites showed that the Ryugu samples have a similar elastic propertyto the Tagish Lake meteorite, which may have come from a D-typeasteroid. Both Ryugu and Tagish Lake show a high degree of aqueousalteration and few high-temperature components such as chondrules,indicating that they formed in the outer region of the solar system.
MASCOT’s in situ analysis of asteroid Ryugu in the context of regolith samples and remote sensing data returned by Hayabusa2

Katharina Otto, Tra-Mi Ho, Stephan Ulamec, Jean-Pierre Bibring, Jens Biele, Matthias Grott, Maximilian Hamm, David Hercik, Ralf Jaumann, Masahiko Sato, Stefan E. Schröder, Satoshi Tanaka, Ulrich Auster, Kohei Kitazato, Jörg Knollenberg, Aurelie Moussi, Tomoki Nakamura, Tatsuaki Okada, Cedric Pilorget, Nicole Schmitz, Seiji Sugita, Koji Wada, Hikaru Yabuta

Earth, Planets and Space　75　(1)　2023/04/06
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40623-023-01805-8 　

eISSN： 1880-5981

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Abstract The Hayabusa2 mission provided a unique data set of asteroid Ryugu that covers a wide range of spatial scale from the orbiter remote sensing instruments to the returned samples. The MASCOT lander that was delivered onto the surface of Ryugu aimed to provide context for these data sets by producing in situ data collected by a camera (MasCam), a radiometer (MARA), a magnetometer (MasMag) and a spectrometer (MicrOmega). In this work, we evaluate the success of MASCOT as an integrated lander to bridge the gap between orbiter and returned sample analysis. We find that MASCOT’s measurements and derivatives thereof, including the rock morphology, colour in the visible wavelengths, possible meteorite analogue, density, and porosity of the rock at the landing site are in good agreement with those of the orbiter and the returned samples. However, it also provides information on the spatial scale (sub-millimetres to centimetres) at which some physical properties such as the thermal inertia and reflectance undergo scale-dependent changes. Some of the in situ observations such as the presence of clast/inclusions in rocks and the absence of fine particles at the landing site was uniquely identified by MASCOT. Thus, we conclude that the delivery of an in situ instrument like MASCOT provides a valuable data set that complements and provides context for remote sensing and returned sample analyses. Graphical Abstract
Nonequilibrium spherulitic magnetite in the Ryugu samples

Elena Dobrica, Hope A. Ishii, John P. Bradley, Kenta Ohtaki, Adrian J. Brearley, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Pena, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre-M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

GEOCHIMICA ET COSMOCHIMICA ACTA　346　65-75　2023/04

DOI： 10.1016/j.gca.2023.02.003 　

ISSN： 0016-7037

eISSN： 1872-9533
Measurement of Microscopic Thermal Diffusivity Distribution for Ryugu Sample by Infrared Lock-in Periodic Heating Method Peer-reviewed

Takuya Ishizaki, Hosei Nagano, Satoshi Tanaka, Naoya Sakatani, Tomoki Nakamura, Tatsuaki Okada, Ryohei Fujita, Abdulkareem Alasli, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei ichiro Watanabe, Yuichi Tsuda

International Journal of Thermophysics　44　(4)　2023/04

DOI： 10.1007/s10765-023-03158-6 　

ISSN： 0195-928X

eISSN： 1572-9567
Extraterrestrial amino acids and amines identified in asteroid Ryugu samples returned by the Hayabusa2 mission

Eric T. Parker, Hannah L. McLain, Daniel P. Glavin, Jason P. Dworkin, Jamie E. Elsila, José C. Aponte, Hiroshi Naraoka, Yoshinori Takano, Shogo Tachibana, Hikaru Yabuta, Hisayoshi Yurimoto, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Yuichi Tsuda, Fuyuto Terui, Takaaki Noguchi, Ryuji Okazaki, Sei-ichiro Watanabe, Tomoki Nakamura

Geochimica et Cosmochimica Acta　347　42-57　2023/04
Publisher: Elsevier BV
DOI： 10.1016/j.gca.2023.02.017 　

ISSN： 0016-7037
Uracil in the carbonaceous asteroid (162173) Ryugu

Yasuhiro Oba, Toshiki Koga, Yoshinori Takano, Nanako O. Ogawa, Naohiko Ohkouchi, Kazunori Sasaki, Hajime Sato, Daniel P. Glavin, Jason P. Dworkin, Hiroshi Naraoka, Shogo Tachibana, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

Nature Communications　14　(1)　2023/03/21
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-023-36904-3 　

eISSN： 2041-1723

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Abstract The pristine sample from the near-Earth carbonaceous asteroid (162173) Ryugu collected by the Hayabusa2 spacecraft enabled us to analyze the pristine extraterrestrial material without uncontrolled exposure to the Earth’s atmosphere and biosphere. The initial analysis team for the soluble organic matter reported the detection of wide variety of organic molecules including racemic amino acids in the Ryugu samples. Here we report the detection of uracil, one of the four nucleobases in ribonucleic acid, in aqueous extracts from Ryugu samples. In addition, nicotinic acid (niacin, a B₃ vitamer), its derivatives, and imidazoles were detected in search for nitrogen heterocyclic molecules. The observed difference in the concentration of uracil between A0106 and C0107 may be related to the possible differences in the degree of alteration induced by energetic particles such as ultraviolet photons and cosmic rays. The present study strongly suggests that such molecules of prebiotic interest commonly formed in carbonaceous asteroids including Ryugu and were delivered to the early Earth.
Re-distribution of volatiles on the airless surface of the C-type carbonaceous asteroid Ryugu.

Toru Matsumoto, Takaaki Noguchi, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hikaru Saito, Satoshi Hata, Dennis Harries, Aki Takigawa, Yuusuke Nakauchi, Shogo Tachibana, Tomoki Nakamura, Megumi Matsumoto, Hope Ishii, John Bradley, Kenta Ohtaki, Elena Dobrică, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Pierre Beck, Thi Phan, Rolando Rebois, Neyda Abreu, Jennifer Gray, Thomas Zega, Pierre-Marie Zanetta, Michelle Thompson, Rhonda Stroud, Katherine Burgess, Brittany Cymes, John Bridges, Leon Hicks, Martin Lee, Luke Daly, Phil Bland, Michael Zolensky, David Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Tatsuhiro Michikami, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

2023/03/16

DOI： 10.21203/rs.3.rs-2389559/v1 　
The noble gas and nitrogen relationship between Ryugu and carbonaceous chondrites

M. W. Broadley, D. J. Byrne, E. Füri, L. Zimmermann, B. Marty, R. Okazaki, T. Yada, F. Kitajima, S. Tachibana, K. Yogata, K. Sakamoto, H. Yurimoto, T. Nakamura, T. Noguchi, H. Naraoka, H. Yabuta, S. Watanabe, Y. Tsuda, M. Nishimura, A. Nakato, A. Miyazaki, M. Abe, T. Okada, T. Usui, M. Yoshikawa, T. Saiki, S. Tanaka, F. Terui, S. Nakazawa, H. Busemann, K. Hashizume, J. D. Gilmour, A. Meshik, M. E.I. Riebe, D. Krietsch, C. Maden, A. Ishida, P. Clay, S. A. Crowther, L. Fawcett, T. Lawton, O. Pravdivtseva, Y. N. Miura, J. Park, K. Bajo, Y. Takano, K. Yamada, S. Kawagucci, Y. Matsui, M. Yamamoto, K. Righter, S. Sakai, N. Iwata, N. Shirai, S. Sekimoto, M. Inagaki, M. Ebihara, R. Yokochi, K. Nishiizumi, K. Nagao, J. I. Lee, A. Kano, M. W. Caffee, R. Uemura

Geochimica et Cosmochimica Acta　345　62-74　2023/03/15

DOI： 10.1016/j.gca.2023.01.020 　

ISSN： 0016-7037
Chemical composition of carbonaceous asteroid Ryugu from synchrotron spectroscopy in the mid- to far-infrared of Hayabusa2-returned samples Peer-reviewed

Emmanuel Dartois, Yoko Kebukawa, Hikaru Yabuta, Jérémie Mathurin, Cécile Engrand, Jean Duprat, Laure Bejach, Alexandre Dazzi, Ariane Deniset-Besseau, Lydie Bonal, Eric Quirico, Christophe Sandt, Ferenc Borondics, Jens Barosch, George D. Cody, Brad T. De Gregorio, Minako Hashiguchi, David A.L. Kilcoyne, Mutsumi Komatsu, Zita Martins, Megumi Matsumoto, Gilles Montagnac, Smail Mostefaoui, Larry R. Nittler, Takuji Ohigashi, Taiga Okumura, Laurent Remusat, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Shohei Yamashita, Tomoki Nakamura, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Takaaki Noguchi, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Hisayoshi Yurimoto, Masanao Abe, Kanami Kamide, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Shogo Tachibana, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei Ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa

Astronomy and Astrophysics　671　2023/03/01

DOI： 10.1051/0004-6361/202244702 　

ISSN： 0004-6361

eISSN： 1432-0746
Interaction between clay minerals and organics in asteroid Ryugu

J.-C. Viennet, M. Roskosz, T. Nakamura, P. Beck, B. Baptiste, B. Lavina, E.E. Alp, M.Y. Hu, J. Zhao, M. Gounelle, R. Brunetto, H. Yurimoto, T. Noguchi, R. Okazaki, H. Yabuta, H. Naraoka, K. Sakamoto, S. Tachibana, T. Yada, M. Nishimura, A. Nakato, A. Miyazaki, K. Yogata, M. Abe, T. Okada, T. Usui, M. Yoshikawa, T. Saiki, S. Tanaka, F. Terui, S. Nakazawa, S.-I. Watanabe, Y. Tsuda

Geochemical Perspectives Letters　25　8-12　2023/03
Publisher: European Association of Geochemistry
DOI： 10.7185/geochemlet.2307 　

ISSN： 2410-339X

eISSN： 2410-3403
Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu International-journal

Hiroshi Naraoka, Yoshinori Takano, Jason P. Dworkin, Yasuhiro Oba, Kenji Hamase, Aogu Furusho, Nanako O. Ogawa, Minako Hashiguchi, Kazuhiko Fukushima, Dan Aoki, Philippe Schmitt-Kopplin, José C. Aponte, Eric T. Parker, Daniel P. Glavin, Hannah L. McLain, Jamie E. Elsila, Heather V. Graham, John M. Eiler, Francois-Regis Orthous-Daunay, Cédric Wolters, Junko Isa, Véronique Vuitton, Roland Thissen, Saburo Sakai, Toshihiro Yoshimura, Toshiki Koga, Naohiko Ohkouchi, Yoshito Chikaraishi, Haruna Sugahara, Hajime Mita, Yoshihiro Furukawa, Norbert Hertkorn, Alexander Ruf, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Shogo Tachibana, Harold C. Connolly, Dante S. Lauretta, Masanao Abe, Toru Yada, Masahiro Nishimura, Kasumi Yogata, Aiko Nakato, Miwa Yoshitake, Ayako Suzuki, Akiko Miyazaki, Shizuho Furuya, Kentaro Hatakeda, Hiromichi Soejima, Yuya Hitomi, Kazuya Kumagai, Tomohiro Usui, Tasuku Hayashi, Daiki Yamamoto, Ryota Fukai, Kohei Kitazato, Seiji Sugita, Noriyuki Namiki, Masahiko Arakawa, Hitoshi Ikeda, Masateru Ishiguro, Naru Hirata, Koji Wada, Yoshiaki Ishihara, Rina Noguchi, Tomokatsu Morota, Naoya Sakatani, Koji Matsumoto, Hiroki Senshu, Rie Honda, Eri Tatsumi, Yasuhiro Yokota, Chikatoshi Honda, Tatsuhiro Michikami, Moe Matsuoka, Akira Miura, Hirotomo Noda, Tetsuya Yamada, Keisuke Yoshihara, Kosuke Kawahara, Masanobu Ozaki, Yu-ichi Iijima, Hajime Yano, Masahiko Hayakawa, Takahiro Iwata, Ryudo Tsukizaki, Hirotaka Sawada, Satoshi Hosoda, Kazunori Ogawa, Chisato Okamoto, Naoyuki Hirata, Kei Shirai, Yuri Shimaki, Manabu Yamada, Tatsuaki Okada, Yukio Yamamoto, Hiroshi Takeuchi, Atsushi Fujii, Yuto Takei, Kento Yoshikawa, Yuya Mimasu, Go Ono, Naoko Ogawa, Shota Kikuchi, Satoru Nakazawa, Fuyuto Terui, Satoshi Tanaka, Takanao Saiki, Makoto Yoshikawa, Sei-ichiro Watanabe, Yuichi Tsuda

Science　379　(6634)　eabn9033　2023/02/24
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/science.abn9033 　

ISSN： 0036-8075

eISSN： 1095-9203

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The Hayabusa2 spacecraft collected samples from the surface of the carbonaceous near-Earth asteroid (162173) Ryugu and brought them to Earth. The samples were expected to contain organic molecules, which record processes that occurred in the early Solar System. We analyzed organic molecules extracted from the Ryugu surface samples. We identified a variety of molecules containing the atoms CHNOS, formed by methylation, hydration, hydroxylation, and sulfurization reactions. Amino acids, aliphatic amines, carboxylic acids, polycyclic aromatic hydrocarbons, and nitrogen-heterocyclic compounds were detected, which had properties consistent with an abiotic origin. These compounds likely arose from an aqueous reaction on Ryugu’s parent body and are similar to the organics in Ivuna-type meteorites. These molecules can survive on the surfaces of asteroids and be transported throughout the Solar System.
Macromolecular organic matter in samples of the asteroid (162173) Ryugu

Hikaru Yabuta, George D. Cody, Cécile Engrand, Yoko Kebukawa, Bradley De Gregorio, Lydie Bonal, Laurent Remusat, Rhonda Stroud, Eric Quirico, Larry Nittler, Minako Hashiguchi, Mutsumi Komatsu, Taiga Okumura, Jérémie Mathurin, Emmanuel Dartois, Jean Duprat, Yoshio Takahashi, Yasuo Takeichi, David Kilcoyne, Shohei Yamashita, Alexandre Dazzi, Ariane Deniset-Besseau, Scott Sandford, Zita Martins, Yusuke Tamenori, Takuji Ohigashi, Hiroki Suga, Daisuke Wakabayashi, Maximilien Verdier-Paoletti, Smail Mostefaoui, Gilles Montagnac, Jens Barosch, Kanami Kamide, Miho Shigenaka, Laure Bejach, Megumi Matsumoto, Yuma Enokido, Takaaki Noguchi, Hisayoshi Yurimoto, Tomoki Nakamura, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Harold C. Connolly, Dante S. Lauretta, Masanao Abe, Tatsuaki Okada, Toru Yada, Masahiro Nishimura, Kasumi Yogata, Aiko Nakato, Miwa Yoshitake, Ayako Iwamae, Shizuho Furuya, Kentaro Hatakeda, Akiko Miyazaki, Hiromichi Soejima, Yuya Hitomi, Kazuya Kumagai, Tomohiro Usui, Tasuku Hayashi, Daiki Yamamoto, Ryota Fukai, Seiji Sugita, Kohei Kitazato, Naru Hirata, Rie Honda, Tomokatsu Morota, Eri Tatsumi, Naoya Sakatani, Noriyuki Namiki, Koji Matsumoto, Rina Noguchi, Koji Wada, Hiroki Senshu, Kazunori Ogawa, Yasuhiro Yokota, Yoshiaki Ishihara, Yuri Shimaki, Manabu Yamada, Chikatoshi Honda, Tatsuhiro Michikami, Moe Matsuoka, Naoyuki Hirata, Masahiko Arakawa, Chisato Okamoto, Masateru Ishiguro, Ralf Jaumann, Jean-Pierre Bibring, Matthias Grott, Stefan Schröder, Katharina Otto, Cedric Pilorget, Nicole Schmitz, Jens Biele, Tra-Mi Ho, Aurélie Moussi-Soffys, Akira Miura, Hirotomo Noda, Tetsuya Yamada, Keisuke Yoshihara, Kosuke Kawahara, Hitoshi Ikeda, Yukio Yamamoto, Kei Shirai, Shota Kikuchi, Naoko Ogawa, Hiroshi Takeuchi, Go Ono, Yuya Mimasu, Kent Yoshikawa, Yuto Takei, Atsushi Fujii, Yu-ichi Iijima, Satoru Nakazawa, Satoshi Hosoda, Takahiro Iwata, Masahiko Hayakawa, Hirotaka Sawada, Hajime Yano, Ryudo Tsukizaki, Masanobu Ozaki, Fuyuto Terui, Satoshi Tanaka, Masaki Fujimoto, Makoto Yoshikawa, Takanao Saiki, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

Science　379　(6634)　2023/02/24
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/science.abn9057 　

ISSN： 0036-8075

eISSN： 1095-9203

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Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by the Hayabusa2 spacecraft. We investigated the macromolecular organic matter in Ryugu samples and found that it contains aromatic and aliphatic carbon, ketone, and carboxyl functional groups. The spectroscopic features of the organic matter are consistent with those in chemically primitive carbonaceous chondrite meteorites that experienced parent-body aqueous alteration (reactions with liquid water). The morphology of the organic carbon includes nanoglobules and diffuse carbon associated with phyllosilicate and carbonate minerals. Deuterium and/or nitrogen-15 enrichments indicate that the organic matter formed in a cold molecular cloud or the presolar nebula. The diversity of the organic matter indicates variable levels of aqueous alteration on Ryugu’s parent body.
Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials International-journal

Daisuke Nakashima, Tomoki Nakamura, Mingming Zhang, Noriko T. Kita, Takashi Mikouchi, Hideto Yoshida, Yuma Enokido, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Fuyuto Terui, Hisayoshi Yurimoto, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Sei-ichiro Watanabe, Shogo Tachibana, Yuichi Tsuda

Nature Communications　14　(1)　532-532　2023/02/16
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-023-36268-8 　

eISSN： 2041-1723

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Abstract Chondrule-like objects and Ca-Al-rich inclusions (CAIs) are discovered in the retuned samples from asteroid Ryugu. Here we report results of oxygen isotope, mineralogical, and compositional analysis of the chondrule-like objects and CAIs. Three chondrule-like objects dominated by Mg-rich olivine are ¹⁶O-rich and -poor with Δ¹⁷O (=δ¹⁷O – 0.52 × δ¹⁸O) values of ~ –23‰ and ~ –3‰, resembling what has been proposed as early generations of chondrules. The ¹⁶O-rich objects are likely to be melted amoeboid olivine aggregates that escaped from incorporation into ¹⁶O-poor chondrule precursor dust. Two CAIs composed of refractory minerals are ¹⁶O-rich with Δ¹⁷O of ~ –23‰ and possibly as old as the oldest CAIs. The discovered objects (<30 µm) are as small as those from comets, suggesting radial transport favoring smaller objects from the inner solar nebula to the formation location of the Ryugu original parent body, which is farther from the Sun and scarce in chondrules. The transported objects may have been mostly destroyed during aqueous alteration in the Ryugu parent body.
Small grains from Ryugu: handling and analysis pipeline for infrared synchrotron microspectroscopy

Stefano Rubino, Zélia Dionnet, Alice Aléon-Toppani, Rosario Brunetto, Tomoki Nakamura, Donia Baklouti, Zahia Djouadi, Cateline Lantz, Obadias Mivumbi, Ferenc Borondics, Stephane Lefrançois, Christophe Sandt, Francesco Capitani, Eva Héripré, David Troadec, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Seiichiro Watanabe, Yuichi Tsuda

Earth, Planets and Space　75　(1)　2023/01/09
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40623-022-01762-8 　

eISSN： 1880-5981

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Abstract Sample-return missions allow the study of materials collected directly from celestial bodies, unbiased by atmospheric entry effects and/or terrestrial alteration and contamination phenomena, using state-of-the-art techniques which are available only in a laboratory environment—but only if the collected material stays pristine. The scarcity of outer-space unaltered material recovered until now makes this material extremely precious for the potential scientific insight it can bring. To maximize the scientific output of current and future sample-return missions, the scientific community needs to plan for ways of storing, handling, and measuring this precious material while preserving their pristine state for as long as the ‘invasiveness’ of measurements allows. In July 2021, as part of the Hayabusa2 (JAXA) “Stone” preliminary examination team, we received several microscopic particles from the asteroid Ryugu, with the goal of performing IR hyper-spectral imaging and IR micro-tomography studies. Here, we describe the sample transfer, handling methods and analytical pipeline we implemented to study this very precious material while minimizing and surveilling their alteration history on Earth. Graphical Abstract
Crack Orientation of Boulders on Ryugu: Meridional Preference and Exfoliation

Sho SASAKI, Shiho KANDA, Hiroshi KIKUCHI, Tatsuhiro MICHIKAMI, Tomokatsu MOROTA, Chikatoshi HONDA, Hideaki MIYAMOTO, Ryodo HEMMI, Seiji SUGITA, Eri TATSUMI, Masanori KANAMARU, Sei-ichiro WATANABE, Noriyuki NAMIKI, Patrick MICHEL, Masatoshi HIRABAYASHI, Naru HIRATA, Tomoki NAKAMURA, Takaaki NOGUCHI, Takahiro HIROI, Naoya SAKATANI, Koji MATSUMOTO, Hirotomo NODA, Shingo KAMEDA, Tohru KOUYAMA, Hidehiko SUZUKI, Manabu YAMADA, Rie HONDA, Yuichiro CHO, Kazuo YOSHIOKA, Masahiko HAYAKAWA, Moe MATSUOKA, Rina NOGUCHI, Hirotaka SAWADA, Yasuhiro YOKOTA, Makoto YOSHIKAWA

Journal of Evolving Space Activities　2023

DOI： 10.57350/jesa.89 　

ISSN： 2758-1802
Noble gas mass-spectrometry for extraterrestrial micro-samples: analyses of asteroid matter returned by Hayabusa2 JAXA mission

Alexander Meshik, Olga Pravdivtseva, Ryuji Okazaki, Kasumi Yogata, Toru Yada, Fumio Kitajima, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Sakai, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Seiichiro Watanabe, Yuichi Tsuda, Hayabusa2 Initial Analysis Volatile Team

Journal of Analytical Atomic Spectrometry　2023
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d3ja00125c 　

ISSN： 0267-9477

eISSN： 1364-5544

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Mass spectrometry of noble gas isotopes from the asteroid materials delivered by robotic space missions requires high sensitivity, high ion transmission, low detection limit, and other characteristics not readily available in commercial instruments.
A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hope A. Ishii, John P. Bradley, Kenta K. Ohtaki, Elena Dobrica, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Pena, Sylvain Laforet, Maya Marinova, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre-M Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Masanao Abe, Masahiko Arakawa, Atsushi Fujii, Masahiko Hayakawa, Naru Hirata, Naoyuki Hirata, Rie Honda, Chikatoshi Honda, Satoshi Hosoda, Yu-ichi Iijima, Hitoshi Ikeda, Masateru Ishiguro, Yoshiaki Ishihara, Takahiro Iwata, Kousuke Kawahara, Shota Kikuchi, Kohei Kitazato, Koji Matsumoto, Moe Matsuoka, Yuya Mimasu, Akira Miura, Tomokatsu Morota, Satoru Nakazawa, Noriyuki Namiki, Hirotomo Noda, Rina Noguchi, Naoko Ogawa, Kazunori Ogawa, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hirotaka Sawada, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Ryudo Tsukizaki, Koji Wada, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Ryohta Fukai, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Hiromichi Soejima, Ayako Suzuki, Tomohiro Usui, Toru Yada, Daiki Yamamoto, Kasumi Yogata, Miwa Yoshitake, Harold C. Connolly, Dante S. Lauretta, Hisayoshi Yurimoto, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

NATURE ASTRONOMY　2022/12

DOI： 10.1038/s41550-022-01841-6 　

ISSN： 2397-3366
Rare earth element identification and quantification in millimetre-sized Ryugu rock fragments from the Hayabusa2 space mission

Pieter Tack, Ella De Pauw, Beverley Tkalcec, Miles Lindner, Benjamin Bazi, Bart Vekemans, Frank Brenker, Marco Di Michiel, Masayuki Uesugi, Hisayoshi Yurimoto, Tomoki Nakamura, Kana Amano, Megumi Matsumoto, Yuri Fujioka, Yuma Enokido, Daisuke Nakashima, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei Ichiro Watanabe, Yuichi Tsuda, Laszlo Vincze

Earth, Planets and Space　74　(1)　2022/12

DOI： 10.1186/s40623-022-01705-3 　

ISSN： 1343-8832

eISSN： 1880-5981
Trace-element analysis of mineral grains in Ryugu rock fragment sections by synchrotron-based confocal X-ray fluorescence

Benjamin Bazi, Pieter Tack, Miles Lindner, Bart Vekemans, Ella De Pauw, Beverley Tkalcec, Frank E. Brenker, Jan Garrevoet, Gerald Falkenberg, Hikaru Yabuta, Hisayoshi Yurimoto, Tomoki Nakamura, Kana Amano, Megumi Matsumoto, Yuri Fujioka, Yuma Enokido, Daisuke Nakashima, Masayuki Uesugi, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda, Laszlo Vincze

Earth, Planets and Space　74　(1)　2022/11/04
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40623-022-01726-y 　

eISSN： 1880-5981

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Abstract A fundamental parameter-based quantification scheme for confocal XRF was applied to sub-micron synchrotron radiation X-ray fluorescence (SR-XRF) data obtained at the beamline P06 of the Deutsches Elektronen-Synchrotron (DESY, Hamburg, Germany) from two sections C0033-01 and C0033-04 that were wet cut from rock fragment C0033 collected from Cb-type asteroid (162173) Ryugu by JAXA’s Hayabusa2 mission. Trace-element quantifications show that C0033 bulk matrix is CI-like, whereas individual mineral grains (i.e., magnetite, pyrrhotite, dolomite, apatite and breunnerite) show, depending on the respective phase, minor to strong deviations. The non-destructive nature of SR-XRF coupled with a new PyMca (a Python toolkit for XRF data analysis)-based quantification approach, performed in parallel with the synchrotron experiments, proves to be an attractive tool for the initial analysis of samples from return missions, such as Hayabusa2 and OSIRIS-REx, the latter returning material from a B-type asteroid (101955) Bennu in 2023. Graphical Abstract
Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution International-journal Peer-reviewed

R. Okazaki, B. Marty, H. Busemann, K. Hashizume, J. D. Gilmour, A. Meshik, T. Yada, F. Kitajima, M. W. Broadley, D. Byrne, E. Füri, M. E. Riebe, D. Krietsch, C. Maden, A. Ishida, P. Clay, S. A. Crowther, L. Fawcett, T. Lawton, O. Pravdivseva, Y. N. Miura, J. Park, K. Bajo, Y. Takano, K. Yamada, S. K. Y. Matsui, M. Yamamoto, K. Righter, S. Sakai, N. Iwata, N. Shirai, S. Sekimoto, M. Inagaki, M. Ebihara, R. Yokochi, K. Nishiizumi, K. Nagao, J. I. Lee, A. Kano, M. W. Caffee, R. Uemura, T. Nakamura, H. Naraoka, T. Noguchi, K. Ogawa, et al.

Science　379　(6634)　2022/10

DOI： 10.1126/science.abo0431 　

ISSN： 0036-8075

eISSN： 1095-9203
Chondrule-like objects and CAIs in asteroid Ryugu: earlier generations of chondrules

Daisuke Nakashima, Tomoki Nakamura, Mingming Zhang, Noriko Kita, Takashi Mikouchi, Hideto Yoshida, Yuma Enokido, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Fuyuto Terui, Hisayoshi Yurimoto, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Sei-ichiro Watanabe, Shogo Tachibana, Yuichi Tsuda

2022/08/29
Publisher: Research Square Platform LLC
DOI： 10.21203/rs.3.rs-1992208/v1 　

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Abstract Chondrule-like objects and Ca-Al-rich inclusions (CAIs) are discovered in the retuned samples from asteroid Ryugu. Three chondrule-like objects, which are ¹⁶O-rich and -poor with D¹⁷O (= d¹⁷O – 0.52 × d¹⁸O) values of ~ − 23‰ and ~ − 3‰, are dominated by Mg-rich olivine, resembling what proposed as earlier generations of chondrules. The ¹⁶O-rich objects are likely to be melted amoeboid olivine aggregates that escaped from incorporation into ¹⁶O-poor chondrule precursor dust. Two CAIs composed of spinel, hibonite, and perovskite are ¹⁶O-rich with D¹⁷O of ~ − 23‰ and possibly as old as the oldest CAIs. The chondrule-like objects and CAIs (< 30 µm) are as small as those from comets, suggesting radial transport favoring smaller objects from the inner solar nebula to the formation location of the Ryugu original parent body, which is farther from the Sun and scarce in chondrules. The transported objects may have been mostly destroyed during aqueous alteration.
Presolar Stardust in Asteroid Ryugu

Jens Barosch, Larry R. Nittler, Jianhua Wang, Conel M. O’D. Alexander, Bradley T. De Gregorio, Cécile Engrand, Yoko Kebukawa, Kazuhide Nagashima, Rhonda M. Stroud, Hikaru Yabuta, Yoshinari Abe, Jérôme Aléon, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Laure Bejach, Martin Bizzarro, Lydie Bonal, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, George D. Cody, Emmanuel Dartois, Nicolas Dauphas, Andrew M. Davis, Alexandre Dazzi, Ariane Deniset-Besseau, Tommaso Di Rocco, Jean Duprat, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Minako Hashiguchi, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Kanami Kamide, Noriyuki Kawasaki, A. L. David Kilcoyne, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Mutsumi Komatsu, Alexander N. Krot, Ming-Chang Liu, Zita Martins, Yuki Masuda, Jérémie Mathurin, Kevin D. McKeegan, Gilles Montagnac, Mayu Morita, Smail Mostefaoui, Kazuko Motomura, Frédéric Moynier, Izumi Nakai, Ann N. Nguyen, Takuji Ohigashi, Taiga Okumura, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Eric Quirico, Laurent Remusat, Sara S. Russell, Naoya Sakamoto, Scott A. Sandford, Maria Schönbächler, Miho Shigenaka, Hiroki Suga, Lauren Tafla, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Maximilien Verdier-Paoletti, Sohei Wada, Meenakshi Wadhwa, Daisuke Wakabayashi, Richard J. Walker, Katsuyuki Yamashita, Shohei Yamashita, Qing-Zhu Yin, Tetsuya Yokoyama, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Shogo Tachibana, Hisayoshi Yurimoto

The Astrophysical Journal Letters　935　(1)　L3-L3　2022/08/01
Publisher: American Astronomical Society
DOI： 10.3847/2041-8213/ac83bd 　

ISSN： 2041-8205

eISSN： 2041-8213

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Abstract We have conducted a NanoSIMS-based search for presolar material in samples recently returned from C-type asteroid Ryugu as part of JAXA's Hayabusa2 mission. We report the detection of all major presolar grain types with O- and C-anomalous isotopic compositions typically identified in carbonaceous chondrite meteorites: 1 silicate, 1 oxide, 1 O-anomalous supernova grain of ambiguous phase, 38 SiC, and 16 carbonaceous grains. At least two of the carbonaceous grains are presolar graphites, whereas several grains with moderate C isotopic anomalies are probably organics. The presolar silicate was located in a clast with a less altered lithology than the typical extensively aqueously altered Ryugu matrix. The matrix-normalized presolar grain abundances in Ryugu are ${4.8}_{-2.6}^{+4.7}$ ppm for O-anomalous grains, ${25}_{-5}^{+6}$ ppm for SiC grains, and ${11}_{-3}^{+5}$ ppm for carbonaceous grains. Ryugu is isotopically and petrologically similar to carbonaceous Ivuna-type (CI) chondrites. To compare the in situ presolar grain abundances of Ryugu with CI chondrites, we also mapped Ivuna and Orgueil samples and found a total of 15 SiC grains and 6 carbonaceous grains. No O-anomalous grains were detected. The matrix-normalized presolar grain abundances in the CI chondrites are similar to those in Ryugu: ${23}_{-6}^{+7}$ ppm SiC and ${9.0}_{-3.6}^{+5.4}$ ppm carbonaceous grains. Thus, our results provide further evidence in support of the Ryugu–CI connection. They also reveal intriguing hints of small-scale heterogeneities in the Ryugu samples, such as locally distinct degrees of alteration that allowed the preservation of delicate presolar material.
NIRS3 spectral analysis of the artificial Omusubi-Kororin crater on Ryugu

A. Galiano, E. Palomba, F. Dirri, A. Longobardo, K. Kitazato, T. Iwata, M. Matsuoka, T. Hiroi, D. Takir, T. Nakamura, M. Abe, M. Ohtake, S. Matsuura, S. Watanabe, M. Yoshikawa, T. Saiki, S. Tanaka, T. Okada, Y. Yamamoto, Y. Takei, K. Shirai, N. Hirata, K. Matsumoto, Y. Tsuda

Monthly Notices of the Royal Astronomical Society　514　(4)　6173-6182　2022/08/01

DOI： 10.1093/mnras/stac1547 　

ISSN： 0035-8711

eISSN： 1365-2966
Measuring the shock stage of Itokawa and asteroid regolith grains by electron backscattered diffraction, optical petrography, and synchrotron X‐ray diffraction

Michael Zolensky, James Martinez, Scott Sitzman, Takashi Mikouchi, Kenji Hagiya, Kazumasa Ohsumi, Mutsumi Komatsu, Tomoki Nakamura, Atsushi Takenouchi, Haruka Ono, Hikari Hasegawa, Kotaro Higashi, Yasuko Terada, Naoto Yagi, Masaki Takata, Hikaru Ozawa, Yuta Taki, Yuta Yamatsuta, Arashi Hirata, Ayaka Kurokawa, Shoki Yamaguchi

Meteoritics & Planetary Science　57　(5)　1060-1078　2022/05
Publisher: Wiley
DOI： 10.1111/maps.13808 　

ISSN： 1086-9379

eISSN： 1945-5100
Pebbles and sand on asteroid (162173) Ryugu: In situ observation and particles returned to Earth

Tachibana, S., Sawada, H., Okazaki, R., Takano, Y., Sakamoto, K., Miura, Y. N., Okamoto, C., Yano, H., Yamanouchi, S., Michel, P., Zhang, Y., Schwartz, S., Thuillet, F., Yurimoto, H., Nakamura, T., Noguchi, T., Yabuta, H., Naraoka, H., Tsuchiyama, A., Imae, N., Kurosawa, K., Nakamura, A. M., Ogawa, K., Sugita, S., Morota, T., Honda, R., Kameda, S., Tatsumi, E., Cho, Y., Yoshioka, K., Yokota, Y., Hayakawa, M., Matsuoka, M., Sakatani, N., Yamada, M., Kouyama, T., Suzuki, H., Honda, C., Yoshimitsu, T., Kubota, T., Demura, H., Yada, T., Nishimura, M., Yogata, K., Nakato, A., Yoshitake, M., Suzuki, A. I., Furuya, S., Hatakeda, K., Miyazaki, A., Kumagai, K., Okada, T., Abe, M., Usui, T., Ireland, T. R., Fujimoto, M., Yamada, T., Arakawa, M., Connolly, H. C., Fujii, A., Hasegawa, S., Hirata, N., Hirata, N., Hirose, C., Hosoda, S., Iijima, Y., Ikeda, H., Ishiguro, M., Ishihara, Y., Iwata, T., Kikuchi, S., Kitazato, K., Lauretta, D. S., Libourel, G., Marty, B., Matsumoto, K., Michikami, T., Mimasu, Y., Miura, A., Mori, O., Nakamura-Messenger, K., Namiki, N., Nguyen, A. N., Nittler, L. R., Noda, H., Noguchi, R., Ogawa, N., Ono, G., Ozaki, M., Senshu, H., Shimada, T., Shimaki, Y., Shirai, K., Soldini, S., Takahashi, T., Takei, Y., Takeuchi, H., Tsukizaki, R., Wada, K., Yamamoto, Y., Yoshikawa, K., Yumoto, K., Zolensky, M. E., Nakazawa, S., Terui, F., Tanaka, S., Saiki, T., Yoshikawa, M., Watanabe, S., Tsuda, Y.

Science　375　(6584)　1011-1016　2022/03
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/science.abj8624 　

ISSN： 0036-8075

eISSN： 1095-9203

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The Hayabusa2 spacecraft investigated the C-type (carbonaceous) asteroid (162173) Ryugu. The mission performed two landing operations to collect samples of surface and subsurface material, the latter exposed by an artificial impact. We present images of the second touchdown site, finding that ejecta from the impact crater was present at the sample location. Surface pebbles at both landing sites show morphological variations ranging from rugged to smooth, similar to Ryugu’s boulders, and shapes from quasi-spherical to flattened. The samples were returned to Earth on 6 December 2020. We describe the morphology of >5 grams of returned pebbles and sand. Their diverse color, shape, and structure are consistent with the observed materials of Ryugu; we conclude that they are a representative sample of the asteroid....
Photometric behavior of Ryugu's NIR spectral parameters

A. Longobardo, E. Palomba, A. Galiano, F. Dirri, A. Zinzi, M. D'Amore, D. Domingue, K. Kitazato, Y. Yokota, S. E. Schroeder, T. Iwata, M. Matsuoka, T. Hiroi, D. Takir, T. Nakamura, M. Abe, M. Ohtake, S. Matsuura, S. Watanabe, M. Yoshikawa, T. Saiki, S. Tanaka, T. Okada, Y. Yamamoto, Y. Takei, K. Shirai, N. Hirata, N. Hirata, K. Matsumoto, Y. Tsuda

Astronomy and Astrophysics　666　2022

DOI： 10.1051/0004-6361/202244097 　

ISSN： 0004-6361

eISSN： 1432-0746
High-resolution imaging mass spectrometry of CHN compounds in meteorites: organic synthesis in the early solar system

Furukawa Yoshihiro, Saigusa Daisuke, Kano Kuniyuki, Uruno Akira, Saito Ritsumi, Ito Motoo, Matsumoto Megumi, Aoki Jyunken, Yamamoto Masayuki, Nakamura Tomoki

Abstracts of Annual Meeting of the Geochemical Society of Japan　69　190　2022
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.69.0_190 　
Martian moons exploration MMX: sample return mission to Phobos elucidating formation processes of habitable planets Invited Peer-reviewed

Kiyoshi Kuramoto, Yasuhiro Kawakatsu, Masaki Fujimoto, Akito Araya, Maria Antonietta Barucci, Hidenori Genda, Naru Hirata, Hitoshi Ikeda, Takeshi Imamura, Jörn Helbert, Shingo Kameda, Masanori Kobayashi, Hiroki Kusano, David J. Lawrence, Koji Matsumoto, Patrick Michel, Hideaki Miyamoto, Tomokatsu Morota, Hiromu Nakagawa, Tomoki Nakamura, Kazunori Ogawa, Hisashi Otake, Masanobu Ozaki, Sara Russell, Sho Sasaki, Hirotaka Sawada, Hiroki Senshu, Shogo Tachibana, Naoki Terada, Stephan Ulamec, Tomohiro Usui, Koji Wada, Sei-ichiro Watanabe, Shoichiro Yokota

Earth, Planets and Space　74　(1)　2022/01

DOI： 10.1186/s40623-021-01545-7 　

eISSN： 1880-5981
Spectral and mineralogical alteration process of naturally-heated CM and CY chondrites

Moe Matsuoka, Tomoki Nakamura, Nobuyoshi Miyajima, Takahiro Hiroi, Naoya Imae, Akira Yamaguchi

Geochimica et Cosmochimica Acta　316　150-167　2022/01
Publisher: Elsevier BV
DOI： 10.1016/j.gca.2021.08.042 　

ISSN： 0016-7037
The MMX rover: performing in situ surface investigations on Phobos Peer-reviewed

Patrick Michel, Stephan Ulamec, Ute Boettger, Matthias Grott, Naomi Murdoch, Pierre Vernazza, Cecily Sunday, Yun Zhang, Rudy Valette, Romain Castellani, Jens Biele, Simon Tardivel, Olivier Groussin, Laurent Jorda, Joerg Knollenberg, Jan Thimo Grundmann, Denis Arrat, Gabriel Pont, Stephane Mary, Markus Grebenstein, Hirdy Miyamoto, Tomoki Nakamura, Koji Wada, Kent Yoshikawa, Kiyoshi Kuramoto

EARTH PLANETS AND SPACE　74　(1)　2022/01

DOI： 10.1186/s40623-021-01464-7 　

eISSN： 1880-5981
MIRS: an imaging spectrometer for the MMX mission

Maria Antonietta Barucci, Jean-Michel Reess, Pernelle Bernardi, Alain Doressoundiram, Sonia Fornasier, Michel Le Du, Takahiro Iwata, Hiromu Nakagawa, Tomoki Nakamura, Yves André, Shohei Aoki, Takehiko Arai, Elisa Baldit, Pierre Beck, Jean-Tristan Buey, Elisabet Canalias, Matthieu Castelnau, Sebastien Charnoz, Marc Chaussidon, Fréderic Chapron, Valerie Ciarletti, Marco Delbo, Bruno Dubois, Stephane Gauffre, Thomas Gautier, Hidenori Genda, Rafik Hassen-Khodja, Gilles Hervet, Ryuki Hyodo, Christian Imbert, Takeshi Imamura, Laurent Jorda, Shingo Kameda, Driss Kouach, Toru Kouyama, Takeshi Kuroda, Hiroyuki Kurokawa, Laurent Lapaw, Jeremie Lasue, Laetitia Le Deit, Aurélien Ledot, Cedric Leyrat, Bertrand Le Ruyet, Moe Matsuoka, Frederic Merlin, Hideaki Miyamoto, Frederic Moynier, Napoleon Nguyen Tuong, Kazunori Ogohara, Takahito Osawa, Jérôme Parisot, Laurie Pistre, Benjamin Quertier, Sean N. Raymond, Francis Rocard, Takeshi Sakanoi, Takao M. Sato, Eric Sawyer, Fériel Tache, Sylvain Trémolières, Fuminori Tsuchiya, Pierre Vernazza, Didier Zeganadin

Earth, Planets and Space　73　(1)　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40623-021-01423-2 　

eISSN： 1880-5981

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Abstract The MMX infrared spectrometer (MIRS) is an imaging spectrometer onboard MMX JAXA mission. MMX (Martian Moon eXploration) is scheduled to be launched in 2024 with sample return to Earth in 2029. MIRS is built at LESIA-Paris Observatory in collaboration with four other French laboratories, collaboration and financial support of CNES and close collaboration with JAXA and MELCO. The instrument is designed to fully accomplish MMX’s scientific and measurement objectives. MIRS will remotely provide near-infrared spectral maps of Phobos and Deimos containing compositional diagnostic spectral features that will be used to analyze the surface composition and to support the sampling site selection. MIRS will also study Mars atmosphere, in particular spatial and temporal changes such as clouds, dust and water vapor. Graphical Abstract
Science operation plan of Phobos and Deimos from the MMX spacecraft Peer-reviewed

Tomoki Nakamura, Hitoshi Ikeda, Toru Kouyama, Hiromu Nakagawa, Hiroki Kusano, Hiroki Senshu, Shingo Kameda, Koji Matsumoto, Ferran Gonzalez-Franquesa, Naoya Ozaki, Yosuke Takeo, Nicola Baresi, Yusuke Oki, David J. Lawrence, Nancy L. Chabot, Patrick N. Peplowski, Maria Antonietta Barucci, Eric Sawyer, Shoichiro Yokota, Naoki Terada, Stephan Ulamec, Patrick Michel, Masanori Kobayashi, Sho Sasaki, Naru Hirata, Koji Wada, Hideaki Miyamoto, Takeshi Imamura, Naoko Ogawa, Kazunori Ogawa, Takahiro Iwata, Takane Imada, Hisashi Otake, Elisabet Canalias, Laurence Lorda, Simon Tardivel, Stephane Mary, Makoto Kunugi, Seiji Mitsuhashi, Alain Doressoundiram, Frederic Merlin, Sonia Fornasier, Jean-Michel Reess, Pernelle Bernardi, Shigeru Imai, Yasuyuki Ito, Hatsumi Ishida, Kiyoshi Kuramoto, Yasuhiro Kawakatsu

EARTH PLANETS AND SPACE　73　(1)　2021/12

DOI： 10.1186/s40623-021-01546-6 　

eISSN： 1880-5981
Spectrally blue hydrated parent body of asteroid (162173) Ryugu

Eri Tatsumi, Naoya Sakatani, Lucie Riu, Moe Matsuoka, Rie Honda, Tomokatsu Morota, Shingo Kameda, Tomoki Nakamura, Michael Zolensky, Rosario Brunetto, Takahiro Hiroi, Sho Sasaki, Sei’ichiro Watanabe, Satoshi Tanaka, Jun Takita, Cédric Pilorget, Julia de León, Marcel Popescu, Juan Luis Rizos, Javier Licandro, Ernesto Palomba, Deborah Domingue, Faith Vilas, Humberto Campins, Yuichiro Cho, Kazuo Yoshioka, Hirotaka Sawada, Yasuhiro Yokota, Masahiko Hayakawa, Manabu Yamada, Toru Kouyama, Hidehiko Suzuki, Chikatoshi Honda, Kazunori Ogawa, Kohei Kitazato, Naru Hirata, Naoyuki Hirata, Yuichi Tsuda, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Satoru Nakazawa, Yuto Takei, Hiroshi Takeuchi, Yukio Yamamoto, Tatsuaki Okada, Yuri Shimaki, Kei Shirai, Seiji Sugita

Nature Communications　12　(1)　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-021-26071-8 　

eISSN： 2041-1723

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<title>Abstract</title>Ryugu is a carbonaceous rubble-pile asteroid visited by the Hayabusa2 spacecraft. Small rubble pile asteroids record the thermal evolution of their much larger parent bodies. However, recent space weathering and/or solar heating create ambiguities between the uppermost layer observable by remote-sensing and the pristine material from the parent body. Hayabusa2 remote-sensing observations find that on the asteroid (162173) Ryugu both north and south pole regions preserve the material least processed by space weathering, which is spectrally blue carbonaceous chondritic material with a 0–3% deep 0.7-µm band absorption, indicative of Fe-bearing phyllosilicates. Here we report that spectrally blue Ryugu’s parent body experienced intensive aqueous alteration and subsequent thermal metamorphism at 570–670 K (300–400 °C), suggesting that Ryugu’s parent body was heated by radioactive decay of short-lived radionuclides possibly because of its early formation 2–2.5 Ma. The samples being brought to Earth by Hayabusa2 will give us our first insights into this epoch in solar system history.
Water-susceptible primordial noble gas components in less-altered CR chondrites: A possible link to cometary materials

Tomoya Obase, Daisuke Nakashima, Jisu Choi, Yuma Enokido, Megumi Matsumoto, Tomoki Nakamura

Geochimica et Cosmochimica Acta　312　75-105　2021/11
Publisher: Elsevier BV
DOI： 10.1016/j.gca.2021.08.012 　

ISSN： 0016-7037
UV-visible-infrared spectral survey of Antarctic carbonaceous chondrite chips

T. Hiroi, H. Kaiden, N. Imae, K. Misawa, H. Kojima, S. Sasaki, M. Matsuoka, T. Nakamura, D.L. Bish, K. Ohtsuka, K.T. Howard, K.R. Robertson, R.E. Milliken

Polar Science　100723-100723　2021/06
Publisher: Elsevier BV
DOI： 10.1016/j.polar.2021.100723 　

ISSN： 1873-9652
High-resolution observations of bright boulders on asteroid Ryugu: 2. Spectral properties

Chiho Sugimoto, Eri Tatsumi, Yuichiro Cho, Tomokatsu Morota, Rie Honda, Shingo Kameda, Yosuhiro Yokota, Koki Yumoto, Minami Aoki, Daniella N. DellaGiustina, Tatsuhiro Michikami, Takahiro Hiroi, Deborah L. Domingue, Patrick Michel, Stefan E. Schröder, Tomoki Nakamura, Manabu Yamada, Naoya Sakatani, Toru Kouyama, Chikatoshi Honda, Masahiko Hayakawa, Moe Matsuoka, Hidehiko Suzuki, Kazuo Yoshioka, Kazunori Ogawa, Hirotaka Sawada, Masahiko Arakawa, Takanao Saiki, Hiroshi Imamura, Yasuhiko Takagi, Hajime Yano, Kei Shirai, Chisato Okamoto, Yuichi Tsuda, Satoru Nakazawa, Yuichi Iijima, Seiji Sugita

Icarus　114591-114591　2021/06
Publisher: Elsevier BV
DOI： 10.1016/j.icarus.2021.114591 　

ISSN： 0019-1035
High-resolution observations of bright boulders on asteroid Ryugu: 1. Size frequency distribution and morphology

Chiho Sugimoto, Eri Tatsumi, Yuichiro Cho, Tomokatsu Morota, Rie Honda, Shingo Kameda, Yosuhiro Yokota, Koki Yumoto, Minami Aoki, Daniella N. DellaGiustina, Tatsuhiro Michikami, Takahiro Hiroi, Deborah L. Domingue, Patrick Michel, Stefan E. Schröder, Tomoki Nakamura, Manabu Yamada, Naoya Sakatani, Toru Kouyama, Chikatoshi Honda, Masahiko Hayakawa, Moe Matsuoka, Hidehiko Suzuki, Kazuo Yoshioka, Kazunori Ogawa, Hirotaka Sawada, Masahiko Arakawa, Takanao Saiki, Hiroshi Imamura, Yasuhiko Takagi, Hajime Yano, Kei Shirai, Chisato Okamoto, Yuichi Tsuda, Satoru Nakazawa, Yuichi Iijima, Seiji Sugita

Icarus　369　114529-114529　2021/05
Publisher: Elsevier BV
DOI： 10.1016/j.icarus.2021.114529 　

ISSN： 0019-1035
Spectral characterization of the craters of Ryugu as observed by the NIRS3 instrument on-board Hayabusa2

Lucie Riu, Cédric Pilorget, Ralph Milliken, Kohei Kitazato, Tomoki Nakamura, Yuichiro Cho, Moe Matsuoka, Seiji Sugita, Masanao Abe, Shuji Matsuura, Makiko Ohtake, Shingo Kameda, Naoya Sakatani, Eri Tatsumi, Yasuhiro Yokota, Takahiro Iwata

Icarus　357　2021/03/15

DOI： 10.1016/j.icarus.2020.114253 　

ISSN： 0019-1035

eISSN： 1090-2643
Thermally altered subsurface material of asteroid (162173) Ryugu

K. Kitazato, R. E. Milliken, T. Iwata, M. Abe, M. Ohtake, S. Matsuura, Y. Takagi, T. Nakamura, T. Hiroi, M. Matsuoka, L. Riu, Y. Nakauchi, K. Tsumura, T. Arai, H. Senshu, N. Hirata, M. A. Barucci, R. Brunetto, C. Pilorget, F. Poulet, J.-P. Bibring, D. L. Domingue, F. Vilas, D. Takir, E. Palomba, A. Galiano, D. Perna, T. Osawa, M. Komatsu, A. Nakato, T. Arai, N. Takato, T. Matsunaga, M. Arakawa, T. Saiki, K. Wada, T. Kadono, H. Imamura, H. Yano, K. Shirai, M. Hayakawa, C. Okamoto, H. Sawada, K. Ogawa, Y. Iijima, S. Sugita, R. Honda, T. Morota, S. Kameda, E. Tatsumi, Y. Cho, K. Yoshioka, Y. Yokota, N. Sakatani, M. Yamada, T. Kouyama, H. Suzuki, C. Honda, N. Namiki, T. Mizuno, K. Matsumoto, H. Noda, Y. Ishihara, R. Yamada, K. Yamamoto, F. Yoshida, S. Abe, A. Higuchi, Y. Yamamoto, T. Okada, Y. Shimaki, R. Noguchi, A. Miura, N. Hirata, S. Tachibana, H. Yabuta, M. Ishiguro, H. Ikeda, H. Takeuchi, T. Shimada, O. Mori, S. Hosoda, R. Tsukizaki, S. Soldini, M. Ozaki, F. Terui, N. Ogawa, Y. Mimasu, G. Ono, K. Yoshikawa, C. Hirose, A. Fujii, T. Takahashi, S. Kikuchi, Y. Takei, T. Yamaguchi, S. Nakazawa, S. Tanaka, M. Yoshikawa, S. Watanabe, Y. Tsuda

Nature Astronomy　5　(3)　246-250　2021/03
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41550-020-01271-2 　

eISSN： 2397-3366
Assessing the debris generated by the small carry-on impactor operated from the Hayabusa2 mission

Motoo Ito, Yoshinori Takano, Yoko Kebukawa, Takuji Ohigashi, Moe Matsuoka, Kento Kiryu, Masayuki Uesugi, Tomoki Nakamura, Hayato Yuzawa, Keita Yamada, Hiroshi Naraoka, Toru Yada, Masanao Abe, Masahiko Hayakawa, Takanao Saiki, Shogo Tachibana

GEOCHEMICAL JOURNAL　55　(4)　223-239　2021

DOI： 10.2343/geochemj.2.0632 　

ISSN： 0016-7002

eISSN： 1880-5973
Collisional history of Ryugu’s parent body from bright surface boulders

E. Tatsumi, C. Sugimoto, L. Riu, S. Sugita, T. Nakamura, T. Hiroi, T. Morota, M. Popescu, T. Michikami, K. Kitazato, M. Matsuoka, S. Kameda, R. Honda, M. Yamada, N. Sakatani, T. Kouyama, Y. Yokota, C. Honda, H. Suzuki, Y. Cho, K. Ogawa, M. Hayakawa, H. Sawada, K. Yoshioka, C. Pilorget, M. Ishida, D. Domingue, N. Hirata, S. Sasaki, J. de León, M. A. Barucci, P. Michel, M. Suemitsu, T. Saiki, S. Tanaka, F. Terui, S. Nakazawa, S. Kikuchi, T. Yamaguchi, N. Ogawa, G. Ono, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, Y. Yamamoto, T. Okada, C. Hirose, S. Hosoda, O. Mori, T. Shimada, S. Soldini, R. Tsukizaki, T. Mizuno, T. Iwata, H. Yano, M. Ozaki, M. Abe, M. Ohtake, N. Namiki, S. Tachibana, M. Arakawa, H. Ikeda, M. Ishiguro, K. Wada, H. Yabuta, H. Takeuchi, Y. Shimaki, K. Shirai, N. Hirata, Y. Iijima, Y. Tsuda, S. Watanabe, M. Yoshikawa

Nature Astronomy　5　(1)　39-45　2021/01
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41550-020-1179-z 　

eISSN： 2397-3366
Characterization of the Ryugu surface by means of the variability of the near-infrared spectral slope in NIRS3 data

A. Galiano, E. Palomba, M. D'Amore, A. Zinzi, F. Dirri, A. Longobardo, K. Kitazato, T. Iwata, M. Matsuoka, T. Hiroi, D. Takir, T. Nakamura, M. Abe, M. Ohtake, S. Matsuura, S. Watanabe, M. Yoshikawa, T. Saiki, S. Tanaka, T. Okada, Y. Yamamoto, Y. Takei, K. Shirai, N. Hirata, N. Hirata, K. Matsumoto, Y. Tsuda

Icarus　351　113959-113959　2020/11
Publisher: Elsevier BV
DOI： 10.1016/j.icarus.2020.113959 　

ISSN： 0019-1035
Hayabusa2 Landing Site Selection: Surface Topography of Ryugu and Touchdown Safety Peer-reviewed

Shota Kikuchi, Sei ichiro Watanabe, Takanao Saiki, Hikaru Yabuta, Seiji Sugita, Tomokatsu Morota, Naru Hirata, Naoyuki Hirata, Tatsuhiro Michikami, Chikatoshi Honda, Yashuhiro Yokota, Rie Honda, Naoya Sakatani, Tatsuaki Okada, Yuri Shimaki, Koji Matsumoto, Rina Noguchi, Yuto Takei, Fuyuto Terui, Naoko Ogawa, Kent Yoshikawa, Go Ono, Yuya Mimasu, Hirotaka Sawada, Hitoshi Ikeda, Chikako Hirose, Tadateru Takahashi, Atsushi Fujii, Tomohiro Yamaguchi, Yoshiaki Ishihara, Tomoki Nakamura, Kohei Kitazato, Koji Wada, Shogo Tachibana, Eri Tatsumi, Moe Matsuoka, Hiroki Senshu, Shingo Kameda, Toru Kouyama, Manabu Yamada, Kei Shirai, Yuichiro Cho, Kazunori Ogawa, Yukio Yamamoto, Akira Miura, Takahiro Iwata, Noriyuki Namiki, Masahiko Hayakawa, Masanao Abe, Satoshi Tanaka, Makoto Yoshikawa, Satoru Nakazawa, Yuichi Tsuda

Space Science Reviews　216　(7)　2020/10/01

DOI： 10.1007/s11214-020-00737-z 　

ISSN： 0038-6308

eISSN： 1572-9672
Full rotationally phase-resolved visible reflectance spectroscopy of 3200 Phaethon

Ohtsuka, Katsuhito, Ito, Takashi, Kinoshita, Daisuke, Abe, Shinsuke, Sawai, Kyosuke, Funabashi, Kazuhiro, Kato, Ryo, Miyasaka, Seidai, Hasegawa, Sunao, Nakamura, Tomoki, Chen, Wen-Ping

Planetary and Space Science　2020　2020/10

DOI： 10.1016/j.pss.2020.104940 　

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We present time-series optical spectroscopic observations of 3200 Phaethon during its 2007 return, complemented with R-band photometry. The spectral gradient centered around 0.55 μm varies between - 5.0 % / 0.1 μm and 0.6 % / 0.1 μm, indicating a B- or C-type color. Moreover, rotational modulation of the spectral slope of this asteroid suggests its surface compositional inhomogeneity, particularly the existence of a C-type surface at a certain longitude on this asteroid....
Sample collection from asteroid (162173) Ryugu by Hayabusa2: Implications for surface evolution International-journal International-coauthorship Peer-reviewed

T. Morota, S. Sugita, Y. Cho, M. Kanamaru, E. Tatsumi, N. Sakatani, R. Honda, N. Hirata, H. Kikuchi, M. Yamada, Y. Yokota, S. Kameda, M. Matsuoka, H. Sawada, C. Honda, T. Kouyama, K. Ogawa, H. Suzuki, K. Yoshioka, M. Hayakawa, N. Hirata, M. Hirabayashi, H. Miyamoto, T. Michikami, T. Hiroi, R. Hemmi, O. S. Barnouin, C. M. Ernst, K. Kitazato, T. Nakamura, L. Riu, H. Senshu, H. Kobayashi, S. Sasaki, G. Komatsu, N. Tanabe, Y. Fujii, T. Irie, M. Suemitsu, N. Takaki, C. Sugimoto, K. Yumoto, M. Ishida, H. Kato, K. Moroi, D. Domingue, P. Michel, C. Pilorget, T. Iwata, M. Abe, M. Ohtake, Y. Nakauchi, K. Tsumura, H. Yabuta, Y. Ishihara, R. Noguchi, K. Matsumoto, A. Miura, N. Namiki, S. Tachibana, M. Arakawa, H. Ikeda, K. Wada, T. Mizuno, C. Hirose, S. Hosoda, O. Mori, T. Shimada, S. Soldini, R. Tsukizaki, H. Yano, M. Ozaki, H. Takeuchi, Y. Yamamoto, T. Okada, Y. Shimaki, K. Shirai, Y. Iijima, H. Noda, S. Kikuchi, T. Yamaguchi, N. Ogawa, G. Ono, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, S. Nakazawa, F. Terui, S. Tanaka, M. Yoshikawa, T. Saiki, S. Watanabe, Y. Tsuda

Science　368　(6491)　654-659　2020/05/08
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/science.aaz6306 　

ISSN： 0036-8075

eISSN： 1095-9203

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The near-Earth asteroid (162173) Ryugu is thought to be a primitive carbonaceous object that contains hydrated minerals and organic molecules. We report sample collection from Ryugu’s surface by the Hayabusa2 spacecraft on 21 February 2019. Touchdown images and global observations of surface colors are used to investigate the stratigraphy of the surface around the sample location and across Ryugu. Latitudinal color variations suggest the reddening of exposed surface material by solar heating and/or space weathering. Immediately after touchdown, Hayabusa2’s thrusters disturbed dark, fine grains that originate from the redder materials. The stratigraphic relationship between identified craters and the redder material indicates that surface reddening occurred over a short period of time. We suggest that Ryugu previously experienced an orbital excursion near the Sun.
Space Weathering Simulation with Low-energy Laser Irradiation of Murchison CM Chondrite for Reproducing Micrometeoroid Bombardments on C-type Asteroids Peer-reviewed

Moe Matsuoka, Tomoki Nakamura, Takahiro Hiroi, Satoshi Okumura, Sho Sasaki

Astrophysical Journal Letters　890　(2)　2020/02/20

DOI： 10.3847/2041-8213/ab72a4 　

ISSN： 2041-8205

eISSN： 2041-8213
Extraterrestrial ribose and other sugars in primitive meteorites. Peer-reviewed

Furukawa Y, Chikaraishi Y, Ohkouchi N, Ogawa N, Glavin D. P, Dworkin J. P, Abe C, Nakamura T

PNAS　116　24440-24445　2019/11
Mechanical properties of particles from the surface of asteroid 25143 Itokawa Peer-reviewed

Tanbakouei Safoura, Trigo-Rodriguez Josep M, Sort Jordi, Michel Patrick, Blum Juergen, Nakamura Tomoki, Williams Iwan

ASTRONOMY & ASTROPHYSICS　629　2019/09/18

DOI： 10.1051/0004-6361/201935380 　

ISSN： 1432-0746
Carbon solubility in silicate melts in equilibrium with a CO-CO2 gas phase and graphite Peer-reviewed

Yoshioka Takahiro, Nakashima Daisuke, Nakamura Tomoki, Shcheka Svyatoslav, Keppler Hans

GEOCHIMICA ET COSMOCHIMICA ACTA　259　129-143　2019/08/15

DOI： 10.1016/j.gca.2019.06.007 　

ISSN： 0016-7037
SPECTRAL CHARACTERISTICS OF ASTEROID (162173) RYUGU WITH HAYABUSA2 NIRS3

Takir D, Kitazato K, Milliken R. E, Iwata T, Abe M, Ohtake M, Matsuura S, Arai T, Nakauchi Y, Nakamura T, Matsuoka M, Senshu H, Hirata N, Hiroi T, Pilorget C, Brnnetto R, Poulet F, Riu L, Bibring J. -P, Domingue D. L, Vilas F, Barucci M. A, Perna D, Palomba E, Galiano A, Tsumura K, Osawa T, Komatsu M, Nakato A, Arai T, Takato N, Matsunaga Y, Takagi Y, Matsumoto K, Kouyama T, Yokota Y, Tatsumi E, Sakatani N, Yamamoto Y, Okada T, Sugita S, Honda R, Morota T, Kameda S, Sawada H, Honda C, Yamada M, Suzuki H, Yoshioka K, Hayakawa M, Ogawa K, Cho Y, Shirai K, Shimaki Y, Hirata N, Yamaguchi A, Ogawa N, Terui F, Yamaguchi T, Takei Y, Saiki T, Nakazawa S, Tanaka S, Yoshikawa M, Watanabe S, Tsuda Y

METEORITICS & PLANETARY SCIENCE　54　.　2019/08

ISSN： 1086-9379
Exposure Experiments of Amorphous Silicates and Organics to Cometary Ice and Vapor Analogs Peer-reviewed

Aki Takigawa, Yoshihiro Furukawa, Yuki Kimura, Bjorn Davidsson, Tomoki Nakamura

ASTROPHYSICAL JOURNAL　881　(1)　2019/08

DOI： 10.3847/1538-4357/ab27c6 　

ISSN： 0004-637X

eISSN： 1538-4357
Nebular history of an ultrarefractory phase bearing CAI from a reduced type CV chondrite Peer-reviewed

Takashi Yoshizaki, Daisuke Nakashima, Tomoki Nakamura, Changkun Park, Naoya Sakamoto, Hatsumi Ishida, Shoichi Itoh

GEOCHIMICA ET COSMOCHIMICA ACTA　252　39-60　2019/05

DOI： 10.1016/j.gca.2019.02.034 　

ISSN： 0016-7037

eISSN： 1872-9533
Nebular history of an ultrarefractory phase bearing CAI from a reduced type CV chondrite Peer-reviewed

Takashi Yoshizaki, Daisuke Nakashima, Tomoki Nakamura, Changkun Park, Naoya Sakamoto, Hatsumi Ishida, Shoichi Itoh

Geochimica et Cosmochimica Acta　252　39-60　2019/05/01

DOI： 10.1016/j.gca.2019.02.034 　

ISSN： 0016-7037
The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy

Kitazato K, Milliken R. E, Iwata T, Abe M, Ohtake M, Matsuura S, Arai T, Nakauchi Y, Nakamura T, Matsuoka M, Senshu H, Hirata N, Hiroi T, Pilorget C, Brunetto R, Poulet F, Riu L, Bibring J. -P, Takir D, Domingue D. L, Vilas F, Barucci M. A, Perna D, Palomba E, Galiano A, Tsumura K, Osawa T, Komatsu M, Nakato A, Arai T, Takato N, Matsunaga T, Takagi Y, Matsumoto K, Kouyama T, Yokota Y, Tatsumi E, Sakatani N, Yamamoto Y, Okada T, Sugita S, Honda R, Morota T, Kameda S, Sawada H, Honda C, Yamada M, Suzuki H, Yoshioka K, Hayakawa M, Ogawa K, Cho Y, Shirai K, Shimaki Y, Hirata N, Yamaguchi A, Ogawa N, Terui F, Yamaguchi T, Takei Y, Saiki T, Nakazawa S, Tanaka S, Yoshikawa M, Watanabe S, Tsuda Y

SCIENCE　364　(6437)　272-+-275　2019/04/19

DOI： 10.1126/science.aav7432 　

ISSN： 0036-8075

eISSN： 1095-9203
Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu-A spinning top-shaped rubble pile

Watanabe S, Hirabayashi M, Hirata N, Hirata Na, Noguchi R, Shimaki Y, Ikeda H, Tatsumi E, Yoshikawa M, Kikuchi S, Yabuta H, Nakamura T, Tachibana S, Ishihara Y, Morota T, Kitazato K, Sakatani N, Matsumoto K, Wada K, Senshu H, Honda C, Michikami T, Takeuchi H, Kouyama T, Honda R, Kameda S, Fuse T, Miyamoto H, Komatsu G, Sugita S, Okada T, Namiki N, Arakawa M, Ishiguro M, Abe M, Gaskell R, Palmer E, Barnouin O. S, Michel P, French A. S, McMahon J. W, Scheeres D. J, Abell P. A, Yamamoto Y, Tanaka S, Shirai K, Matsuoka M, Yamada M, Yokota Y, Suzuki H, Yoshioka K, Cho Y, Tanaka S, Nishikawa N, Sugiyama T, Kikuchi H, Hemmi R, Yamaguchi T, Ogawa N, Ono G, Mimasu Y, Yoshikawa K, Takahashi T, Takei Y, Fujii A, Hirose C, Iwata T, Hayakawa M, Hosoda S, Mori O, Sawada H, Shimada T, Soldini S, Yano H, Tsukizaki R, Ozaki M, Iijima Y, Ogawa K, Fujimoto M, Ho T. -M, Moussi A, Jaumann R, Bibring J. -P, Krause C, Terui F, Saiki T, Nakazawa S, Tsuda Y

SCIENCE　364　(6437)　268-+-eaav8032　2019/04/19
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/science.aav8032 　

ISSN： 0036-8075

eISSN： 1095-9203

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The Hayabusa2 spacecraft arrived at the near-Earth carbonaceous asteroid 162173 Ryugu in 2018. We present Hayabusa2 observations of Ryugu’s shape, mass, and geomorphology. Ryugu has an oblate ‘spinning top’ shape with a prominent circular equatorial ridge. Its bulk density, 1.19 ± 0.02 g cm^–3, indicates a high porosity (>50%) interior. Large surface boulders suggest a rubble-pile structure. Surface slope analysis shows Ryugu’s shape may have been produced if it once spun at twice the current rate. Coupled with the observed global material homogeneity, this suggests that Ryugu was reshaped by centrifugally induced deformation during a period of rapid rotation. From these remote-sensing investigations, we identify a suitable sample collection site on the equatorial ridge.
The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes Peer-reviewed

S. Sugita, R. Honda, T. Morota, S. Kameda, H. Sawada, E. Tatsumi, M. Yamada, C. Honda, Y. Yokota, T. Kouyama, N. Sakatani, K. Ogawa, H. Suzuki, T. Okada, N. Namiki, S. Tanaka, Y. Iijima, K. Yoshioka, M. Hayakawa, Y. Cho, M. Matsuoka, N. Hirata, N. Hirata, H. Miyamoto, D. Domingue, M. Hirabayashi, T. Nakamura, T. Hiroi, T. Michikami, P. Michel, R.-L. Ballouz, O. S. Barnouin, C. M. Ernst, S. E. Schröder, H. Kikuchi, R. Hemmi, G. Komatsu, T. Fukuhara, M. Taguchi, T. Arai, H. Senshu, H. Demura, Y. Ogawa, Y. Shimaki, T. Sekiguchi, T. G. Müller, A. Hagermann, T. Mizuno, H. Noda, K. Matsumoto, R. Yamada, Y. Ishihara, H. Ikeda, H. Araki, K. Yamamoto, S. Abe, F. Yoshida, A. Higuchi, S. Sasaki, S. Oshigami, S. Tsuruta, K. Asari, S. Tazawa, M. Shizugami, J. Kimura, T. Otsubo, H. Yabuta, S. Hasegawa, M. Ishiguro, S. Tachibana, E. Palmer, R. Gaskell, L. Le Corre, R. Jaumann, K. Otto, N. Schmitz, P. A. Abell, M. A. Barucci, M. E. Zolensky, F. Vilas, F. Thuillet, C. Sugimoto, N. Takaki, Y. Suzuki, H. Kamiyoshihara, M. Okada, K. Nagata, M. Fujimoto, M. Yoshikawa, Y. Yamamoto, K. Shirai, R. Noguchi, N. Ogawa, F. Terui, S. Kikuchi, T. Yamaguchi, Y. Oki, Y. Takao, H. Takeuchi, G. Ono, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, C. Hirose, S. Nakazawa, S. Hosoda, O. Mori, T. Shimada, S. Soldini, T. Iwata, M. Abe, H. Yano, R. Tsukizaki, M. Ozaki, K. Nishiyama, T. Saiki, S. Watanabe, Y. Tsuda

Science　364　eaaw0422　2019/03/19

DOI： 10.1126/science.aaw0422 　
A rover for the JAXA MMX mission to phobos Peer-reviewed

Stephan Ulamec, Patrick Michel, Matthias Grott, Ute Böttger, Heinz Wilhelm Hübers, Naomi Murdoch, Pierre Vernazza, Özgür Karatekin, Jörg Knollenberg, Konrad Willner, Markus Grebenstein, Stephane Mary, Pascale Chazalnoël, Jens Biele, Christian Krause, Tra Mi Ho, Caroline Lange, Jan Thimo Grundmann, Kaname Sasaki, Michael Maibaum, Oliver Küchemann, Josef Reill, Maxime Chalon, Stefan Barthelmes, Roy Lichtenheldt, Rainer Krenn, Michal Smisek, Jean Bertrand, Aurélie Moussi, Cedric Delmas, Simon Tardivel, Denis Arrat, Frans IJpelaan, Laurence Mélac, Laurence Lorda, Emile Remetean, Michael Lange, Olaf Mierheim, Siebo Reershemius, Tomohiro Usui, Moe Matsuoka, Tomoki Nakamura, Koji Wada, Hirdy Miyamoto, Kiyoshi Kuramoto, Julia LeMaitre, Guillaume Mas, Michel Delpech, Loisel Celine, Arthur Rafflegeau, Honorine Boirard, Roseline Schmisser, Cédric Virmontois, Celine Cenac-Morthe, Dominique Besson, Fernando Rull

Proceedings of the International Astronautical Congress, IAC　2019-October　2019

ISSN： 0074-1795
Multivariable statistical analysis of spectrophotometry and spectra of (162173) Ryugu as observed by JAXA Hayabusa2 mission Peer-reviewed

Barucci M. A, Hasselmann P. H, Fulchignoni M, Honda R, Yokota Y, Sugita S, Kitazato K, Deshapriya J. D. P, Perna D, Tatsumi E, Dominique1 D, Morota T, Kameda S, Iwata T, Abe M, Ohtake M, Matsuura S, Matsuoka M, Hiroi T, Nakamura T, Kouyama T, Suzuki H, Yamada M, Sakatani N, Honda C, Ogawa K, Hayakawa M, Yoshioka K, Cho Y, Sawada H, Takir D, Vilas F, Hirata N, Hirata N, Tanaka S, Yamamoto Y, Yoshikawa M, Watanabe S, Tsuda Y

Multivariable statistical analysis of spectrophotometry and spectra of (162173) Ryugu as observed by JAXA Hayabusa2 mission　629　A13　2019
Interplanetary Dust, Meteoroids, Meteors and Meteorites. Peer-reviewed

Koschny D, Soja R. H, Engrand C, Flynn G. J, Lasue J, Levasseur-Regourd A-C, Malaspina D, Nakamura T, Poppe A. R, Sterken V. J, Trigo-Rodrguez J. M

Space Science Reviews　215　34　2019
Surface composition of asteroid 162173 Ryugu as observed by the Hayabusa2 NIRS3 instrument. Peer-reviewed

Kitazato K, l, Nakamura T, authors

Science　364　272-275　2019
Hayabusa2 observations of the spinning-top-shaped carbonaceous asteroid 162173 Ryugu. Peer-reviewed

Watanabe S, Nakamura T, authors

Science　364　268-272　2019
Heating experiments of the Tagish Lake meteorite: Investigation of the effects of short-term heating on chondritic organics Peer-reviewed

Queenie H.S. Chan, Aiko Nakato, Yoko Kebukawa, Michael E. Zolensky, Tomoki Nakamura, Jessica A. Maisano, Matthew W. Colbert, James E. Martinez, A. L.David Kilcoyne, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Kazuhiko Mase, Ian P. Wright

Meteoritics and Planetary Science　54　(1)　104-125　2019/01

DOI： 10.1111/maps.13193 　

ISSN： 1086-9379
A SHORT TIMESCALE FOR CAI RIM FORMATION. Peer-reviewed

Yoshizaki T, Nakamura T, Nakashima D, Sakamoto N, Ishida H, Itoh S

METEORITICS & PLANETARY SCIENCE　53　6012　2018/08

ISSN： 1086-9379
Flyby missions to comets and return sample analysis Peer-reviewed

Donald E. Brownlee, Benton C. Clark, Michael F. A'Hearn, Jessica M. Sunshine, Tomoki Nakamura

Elements　14　(2)　87-93　2018/04/01

DOI： 10.2138/gselements.14.2.87 　

ISSN： 1811-5217 1811-5209
Redistribution of Sr and rare earth elements in the matrices of CV3 carbonaceous chondrites during aqueous alteration in their parent body Peer-reviewed

Jogo Kaori, Ito Motoo, Nakamura Tomoki, Kobayashi Sachio, Lee Jong Ik

EARTH PLANETS AND SPACE　70　2018/03/12

DOI： 10.1186/s40623-018-0809-5 　

ISSN： 1880-5981
Oxygen isotope reservoirs in the outer asteroid belt inferred from oxygen isotope systematics of chondrule olivines and isolated forsterite and olivine grains in Tagish Lake-type carbonaceous chondrites, WIS 91600 and MET 00432 Peer-reviewed

Masakuni Yamanobe, Tomoki Nakamura, Daisuke Nakashima

Polar Science　15　29-38　2018/03/01
Publisher: Elsevier B.V.
DOI： 10.1016/j.polar.2017.12.002 　

ISSN： 1873-9652
Origin and cosmochemical implications of rubinite (Ca3Ti3+2Si3O12), a new CAI mineral from the Allende CV chondrite Peer-reviewed

Yoshizaki Takashi, Nakamura Tomoki, Muto Jun

Abstracts of Annual Meeting of the Geochemical Society of Japan　65　(0)　187-187　2018
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.65.0_187 　

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New minerals from chondritic refractory inclusions potentially record a specific history of the earliest stage of the solar system evolution. Rubinite (Ca₃Ti³⁺₂Si₃O₁₂) is a new garnet mineral identified in refractory inclusions from CV carbonaceous chondrites. Petrology and mineral chemistry of rubinite from the Allende CV chondrite suggest formation from a partial melt of a pre-existing nebula condensate under highly reduced conditions near the proto-Sun. Since mineralogical and petrological variations observed in Allende rubinite might reflect physicochemical conditions of both nebular and asteroidal processes, further investigation of the mineral will provide us new insights into the early solar system processes.
Martian Moons eXploration MMX elucidating the formation of habitable planets in the solar system

Kuramoto K, Morota T, Nagaoka H, Nakagawa H, Nakamura T, Ogawa K, Otake H, Ozaki M, Sasaki S, Senshu H, Tachibana S, Kawakatsu Y, Terada N, Usui T, Wada K, Watanabe S, MMX study team, Fujimoto M, Genda H, Hirata N, Imamura T, Kameda S, Matsumoto K, Miyamoto H

Planetary People - The Japanese Society for Planetary Sciences　27　(3)　207-215　2018
Publisher: 日本惑星科学会
DOI： 10.14909/yuseijin.27.3_207 　

ISSN： 0918-273X

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火星衛星Phobosからのサンプルリターンに挑む火星衛星探査計画 (Martian Moons eXploration: MMX) は，現在，宇宙航空研究開発機構 (JAXA) プリプロジェクトとして，2024年の打ち上げと5年の往還期間を設定し，精力的な検討・初期開発が進められている．MMXは，サンプル分析，Deimosを加えた火星衛星の近接観測，そして火星大気および火星圏のモニタリング観測を組み合わせることにより，惑星に寄りそう衛星という切り口と視座から，太陽系における大気と水を湛えたハビタブル惑星の形成と進化の解明に迫ろうとしている．
Thermal and impact histories of 25143 Itokawa recorded in Hayabusa particles. Peer-reviewed

Terada K, Sano Y, Takahata N, Ishida A, Tsuchiyama A, Nakamura T, Noguchi T, Karouji Y, Uesugi M, Yada T, Nakabayashi M, Kamioka M, Fukuda K, Nagahara H

Scientific Reports　8　11806　2018
Dust Phenomena Relating to Airless Bodies Peer-reviewed

Szalay J. R, PoppeA. R, Agarwal J, Britt D, Belskaya I, Horanyi M, Nakamura T, Sachse M, Spahn F

Space Science Reviews　214　98　2018
The origin of the unique achondrite Northwest Africa 6704: Constraints from petrology, chemistry and Re–Os, O and Ti isotope systematics Peer-reviewed

Yuki Hibiya, Gregory J. Archer, Ryoji Tanaka, Matthew E. Sanborn, Yuya Sato, Tsuyoshi Iizuka, Kazuhito Ozawa, Richard J. Walker, Akira Yamaguchi, Qing-Zhu Yin, Tomoki Nakamura, Anthony J. Irving

Geochimica et Cosmochimica Acta　245　597-627　2018

DOI： 10.1016/j.gca.2018.04.031 　

ISSN： 0016-7037
On the impact origin of Phobos and Deimos III: Resulting composition from different impactors. Peer-reviewed

Pignatale F. C, Charnoz S, Rosenblatt P, Hyodo R, Nakamura T, Genda H

The Astrophysical Journal　853　118　2018/01
Formation of an ultracarbonaceous Antarctic micrometeorite through minimal aqueous alteration in a small porous icy body Peer-reviewed

Hikaru Yabuta, Takaaki Noguchi, Shoichi Itoh, Tomoki Nakamura, Akira Miyake, Shinichi Tsujimoto, Noriaki Ohashi, Naoya Sakamoto, Minako Hashiguchi, Ken-ichi Abe, Aya Okubo, A. L. David Kilcoyne, Shogo Tachibana, Ryuji Okazaki, Kentaro Terada, Mitsuru Ebihara, Hiroko Nagahara

GEOCHIMICA ET COSMOCHIMICA ACTA　214　172-190　2017/10

DOI： 10.1016/j.gca.2017.06.047 　

ISSN： 0016-7037

eISSN： 1872-9533
An evaluation method of reflectance spectra to be obtained by Hayabusa2 Near-Infrared Spectrometer (NIRS3) based on laboratory measurements of carbonaceous chondrites Peer-reviewed

Moe Matsuoka, Tomoki Nakamura, Takahito Osawa, Takahiro Iwata, Kohei Kitazato, Masanao Abe, Yusuke Nakauchi, Takehiko Arai, Mutsumi Komatsu, Takahiro Hiroi, Naoya Imae, Akira Yamaguchi, Hideyasu Kojima

EARTH PLANETS AND SPACE　69　120　2017/09

DOI： 10.1186/s40623-017-0705-4 　

ISSN： 1880-5981

eISSN： 1880-5981
ORIGIN OF SPINEL FRAMBOIDS IN CALCIUM-ALUMINUM-RICH INCLUSIONS Peer-reviewed

T. Yoshizaki, D. Nakashima, T. Nakamura, H. Ishida, N. Sakamoto

METEORITICS & PLANETARY SCIENCE　52　A400-A400　2017/08

ISSN： 1086-9379

eISSN： 1945-5100
Hayabusa2 Sample Catcher and Container: Metal-Seal System for Vacuum Encapsulation of Returned Samples with Volatiles and Organic Compounds Recovered from C-Type Asteroid Ryugu Peer-reviewed

Ryuji Okazaki, Hirotaka Sawada, Shinji Yamanouchi, Shogo Tachibana, Yayoi N. Miura, Kanako Sakamoto, Yoshinori Takano, Masanao Abe, Shoichi Itoh, Keita Yamada, Hikaru Yabuta, Chisato Okamoto, Hajime Yano, Takaaki Noguchi, Tomoki Nakamura, Keisuke Nagao

SPACE SCIENCE REVIEWS　208　(1-4)　107-124　2017/07

DOI： 10.1007/s11214-016-0289-5 　

ISSN： 0038-6308

eISSN： 1572-9672
Variation of mineralogy and organic material during the early stages of aqueous activity recorded in Antarctic micrometeorites Peer-reviewed

T. Noguchi, H. Yabuta, S. Itoh, N. Sakamoto, T. Mitsunari, A. Okubo, R. Okazaki, T. Nakamura, S. Tachibana, K. Terada, M. Ebihara, N. Imae, M. Kimura, H. Nagahara

GEOCHIMICA ET COSMOCHIMICA ACTA　208　119-144　2017/07

DOI： 10.1016/j.gca.2017.03.034 　

ISSN： 0016-7037

eISSN： 1872-9533
Thermal Imaging Performance of TIR onboard the Hayabusa2 Spacecraft Peer-reviewed

Arai T, Nakamura T, Tanaka S, Demura H, Ogawa Y, Senshu H, Fukuhara T, Okada T

Space Science Reviews　2017/03
Luminescence spectroscopical properties of plagioclase particles from the Hayabusa Sample Return Mission: An implication for study of space weathering processes in the asteroid Itokawa Peer-reviewed

Arnold Gucsik, Tomoki Nakamura, Cornelia Jäger, Kiyotaka Ninagawa, Hirotsugu Nishido, Masahiro Kayama, Akira Tsuchiyama, Ulrich Ott, Ákos Kereszturi

Microscopy and Microanalysis　23　(1)　179-186　2017/02/01
Publisher: Cambridge University Press
DOI： 10.1017/S1431927617000046 　

ISSN： 1435-8115 1431-9276
Mn-Cr ages and formation conditions of fayalite in CV3 carbonaceous chondrites: Constraints on the accretion ages of chondritic asteroids Peer-reviewed

Kaori Jogo, Tomoki Nakamura, Motoo Ito, Shigeru Wakita, Mikhail Yu. Zolotov, Scott R. Messenger

GEOCHIMICA ET COSMOCHIMICA ACTA　199　58-74　2017/02

DOI： 10.1016/j.gca.2016.11.027 　

ISSN： 0016-7037

eISSN： 1872-9533
NIRS3: The Near Infrared Spectrometer on Hayabusa2 Peer-reviewed

Iwata T, Kitazato K, Abe M, Ohtake M, Arai T, Arai T, Hirata N, Hiroi T, Honda C, Imae N, Komatsu M, Matsunaga T, Matsuoka M, Matsuura S, Nakamura T, Nakato A, Nakauchi Y, Osawa T, Senshu H, Takagi Y, Tsumura K, Takato N, Watanabe S, Barucci M. A, Palomba E, Ozaki M

Space Science Reviews　2017/02
An Investigation of Elemental Composition of Martian Satellites by Gamma-ray and Neutron Spectrometer

Nobuyuki Hasebe, Toru Ohta, Yoshiharu Amano, Masayuki Naito, Hiroki Kusano, Hiroshi Nagaoka, Kohei Yoshida, Takuto Adachi, Timothy J. Fagan, Haruyoshi Kuno, Eido Shibamura, Akira Hitachi, José A. Matias Lopes, Jesus Martínez-Frías, Tomoki Nakamura, Shingo Kameda, Yuichiro Cho, Naoki Shirai, Hideaki Miyamoto, Takafumi Niihara, Takashi Mikouchi, Tatsuaki Okada, Yuzuru Karouji

Proceedings of International Symposium on Radiation Detectors and Their Uses (ISRD2016)　2016/11/14
Publisher: Journal of the Physical Society of Japan
DOI： 10.7566/jpscp.11.040006 　
Nanomorphology of Itokawa regolith particles: Application to space-weathering processes affecting the Itokawa asteroid Peer-reviewed

Toru Matsumoto, Akira Tsuchiyama, Kentaro Uesugi, Tsukasa Nakano, Masayuki Uesugi, Junya Matsuno, Takashi Nagano, Akira Shimada, Akihisa Takeuchi, Yoshio Suzuki, Tomoki Nakamura, Michihiko Nakamura, Arnold Gucsik, Keita Nagaki, Tatsuhiro Sakaiya, Tadashi Kondo

GEOCHIMICA ET COSMOCHIMICA ACTA　187　195-217　2016/08

DOI： 10.1016/j.gca.2016.05.011 　

ISSN： 0016-7037

eISSN： 1872-9533
火の鳥「はやぶさ」未来編その10 ～地球からの小惑星物質回収～遊星人

中村智樹, イ, ジョンイク,パクチャンクン, 長尾敬介

日本惑星学会誌　25　13-18　2016/03

DOI： 10.14909/yuseijin.25.1_13 　
Detectability of hydrous minerals using ONC-T camera onboard the Hayabusa2 spacecraft Peer-reviewed

S. Kameda, H. Suzuki, Y. Cho, S. Koga, M. Yamada, T. Nakamura, T. Hiroi, H. Sawada, R. Honda, T. Morota, C. Honda, A. Takei, T. Takamatsu, Y. Okumura, M. Sato, T. Yasuda, K. Shibasaki, S. Ikezawa, S. Sugita

ADVANCES IN SPACE RESEARCH　56　(7)　1519-1524　2015/10

DOI： 10.1016/j.asr.2015.06.037 　

ISSN： 0273-1177

eISSN： 1879-1948
Pulse-laser irradiation experiments of Murchison CM2 chondrite for reproducing space weathering on C-type asteroids Peer-reviewed

Moe Matsuoka, Tomoki Nakamura, Yuki Kimura, Takahiro Hiroi, Ryosuke Nakamura, Satoshi Okumura, Sho Sasaki

ICARUS　254　135-143　2015/07

DOI： 10.1016/j.icarus.2015.02.029 　

ISSN： 0019-1035

eISSN： 1090-2643
Mineralogy and noble gas isotopes of micrometeorites collected from Antarctic snow Peer-reviewed

Ryuji Okazaki, Takaaki Noguchi, Shin-ichi Tsujimoto, Yu Tobimatsu, Tomoki Nakamura, Mitsuru Ebihara, Shoichi Itoh, Hiroko Nagahara, Shogo Tachibana, Kentaro Terada, Hikaru Yabuta

EARTH PLANETS AND SPACE　67　(90)　1-17　2015/06

DOI： 10.1186/s40623-015-0261-8 　

ISSN： 1880-5981
Calibration and first light of optical navigation camera (ONC) of Hayabusa 2

S. Sugita, S. Kameda, H. Sawada, H. Suzuki, M. Yamada, R. Honda, T. Morota, C. Honda, K. Ogawa, K. Shirai, Y. Iijima, Y. Cho, A. Takei, M. Sato, Y. Okumura, T. Yasuda, K. Shibasaki, S. Ikezawa, T. Nakamura, T. Hiroi, S. Kamata, S. C. Koga, ONC Team

Proceedings of Lunar and Planetary Science Conference　46　2169　2015/03
Chemical and mineralogical compositions of two grains recovered from asteroid Itokawa Peer-reviewed

M. Ebihara, N. Shirai, S. Sekimoto, T. Nakamura, A. Tsuchiyama, J. Matsuno, T. Matsumoto, M. Tanaka, M. Abe, A. Fujimura, Y. Ishibashi, Y. Karouji, T. Mukai, T. Okada, M. Uesugi, T. Yada

METEORITICS & PLANETARY SCIENCE　50　(2)　243-254　2015/02

DOI： 10.1111/maps.12418 　

ISSN： 1086-9379

eISSN： 1945-5100
The formation and evolution of ordinary chondrite parent bodies Peer-reviewed

Vernazza P, Zanda B, Nakamura T, Scott E, Russell S

In Asteroids IV　617-634　2015

DOI： 10.2458/azu_uapress_9780816530595-ch032 　
Cometary dust in Antarctic ice and snow: Past and present chondritic porous micrometeorites preserved on the Earth's surface Peer-reviewed

Takaaki Noguchi, Noriaki Ohashi, Shinichi Tsujimoto, Takuya Mitsunari, John P. Bradley, Tomoki Nakamura, Shoichi Toh, Thomas Stephan, Naoyoshi Iwata, Naoya Imae

EARTH AND PLANETARY SCIENCE LETTERS　410　1-11　2015/01

DOI： 10.1016/j.epsl.2014.11.012 　

ISSN： 0012-821X

eISSN： 1385-013X
Mineralogy and petrography of C asteroid regolith: The Sutter's Mill CM meteorite Peer-reviewed

Michael Zolensky, Takashi Mikouchi, Marc Fries, Robert Bodnar, Peter Jenniskens, Qing-zhu Yin, Kenji Hagiya, Kazumasa Ohsumi, Mutsumi Komatsu, Matthew Colbert, Romy Hanna, Jessie Maisano, Richard Ketcham, Yoko Kebukawa, Tomoki Nakamura, Moe Matsuoka, Sho Sasaki, Akira Tsuchiyama, Matthieu Gounelle, Loan Le, James Martinez, Kent Ross, Zia Rahman

METEORITICS & PLANETARY SCIENCE　49　(11)　1997-2016　2014/11

DOI： 10.1111/maps.12386 　

ISSN： 1086-9379

eISSN： 1945-5100
Mineralogy of four Itokawa particles collected from the first touchdown site Peer-reviewed

Takaaki Noguchi, John C. Bridges, Leon J. Hicks, Steven J. Gurman, Makoto Kimura, Takahito Hashimoto, Mitsuru Konno, John P. Bradley, Ryuji Okazaki, Masayuki Uesugi, Toru Yada, Yuzuru Karouji, Masanao Abe, Tatsuaki Okada, Takuya Mitsunari, Tomoki Nakamura, Hiroyuki Kagi

EARTH PLANETS AND SPACE　66　124　2014/10

DOI： 10.1186/1880-5981-66-124 　

ISSN： 1880-5981
Investigation of cutting methods for small samples of Hayabusa and future sample return missions Peer-reviewed

Masayuki Uesugi, Ryo Noguchi, Tooru Matsumoto, Junya Matsuno, Takashi Nagano, Akira Tsuchiyama, Shigenori Harada, Kaori Yokoyama, Yoshiaki Yodo, Noboru Takeda, Toru Yada, Shogo Yakame, Yuzuru Karouji, Yukihiro Ishibashi, Masanao Abe, Tatsuaki Okada, Akio Fujimura, Mitsuru Ebihara, Fumio Kitajima, Keisuke Nagao, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Hisayoshi Yurimoto

METEORITICS & PLANETARY SCIENCE　49　(7)　1186-1201　2014/07

DOI： 10.1111/maps.12322 　

ISSN： 1086-9379

eISSN： 1945-5100
Sylvite and halite on particles recovered from 25143 Itokawa: A preliminary report Peer-reviewed

T. Noguchi, M. Kimura, T. Hashimoto, M. Konno, T. Nakamura, M. E. Zolensky, A. Tsuchiyama, T. Matsumoto, J. Matsuno, R. Okazaki, M. Uesugi, Y. Karouji, T. Yada, Y. Ishibashi, K. Shirai, M. Abe, T. Okada

METEORITICS & PLANETARY SCIENCE　49　(7)　1305-1314　2014/07

DOI： 10.1111/maps.12333 　

ISSN： 1086-9379

eISSN： 1945-5100
Corrigendum to "Petrographic, chemical and spectroscopic evidence for thermal metamorphism in carbonaceous chondrites I: CI and CM chondrites" [Geochim. Cosmochim. Acta 126 (2014) 284-306] Peer-reviewed

Eric Tonui, Mike Zolensky, Takahiro Hiroi, Tomoki Nakamura, Michael E. Lipschutz, Ming-Sheng Wang, Kyoko Okudaira

Geochimica et Cosmochimica Acta　132　458　2014/05/01
Publisher: Elsevier Ltd
DOI： 10.1016/j.gca.2014.02.022 　

ISSN： 0016-7037
FAST ROTATION OF A SUBKILOMETER-SIZED NEAR-EARTH OBJECT 2011 XA(3) Peer-reviewed

Seitaro Urakawa, Katsuhito Ohtsuka, Shinsuke Abe, Takashi Ito, Tomoki Nakamura

ASTRONOMICAL JOURNAL　147　(5)　121-128　2014/05

DOI： 10.1088/0004-6256/147/5/121 　

ISSN： 0004-6256

eISSN： 1538-3881
Space weathered rims found on the surfaces of the Itokawa dust particles Peer-reviewed

Takaaki Noguchi, Makoto Kimura, Takahito Hashimoto, Mitsuru Konno, Tomoki Nakamura, Michael E. Zolensky, Ryuji Okazaki, Masahiko Tanaka, Akira Tsuchiyama, Aiko Nakato, Toshinori Ogami, Hatsumi Ishida, Ryosuke Sagae, Shinichi Tsujimoto, Toru Matsumoto, Junya Matsuno, Akio Fujimura, Masanao Abe, Toru Yada, Toshifumi Mukai, Munetaka Ueno, Tatsuaki Okada, Kei Shirai, Yukihiro Ishibashi

METEORITICS & PLANETARY SCIENCE　49　(2)　188-214　2014/02

DOI： 10.1111/maps.12111 　

ISSN： 1086-9379

eISSN： 1945-5100
Hayabusa-returned sample curation in the Planetary Material Sample Curation Facility of JAXA Peer-reviewed

Toru Yada, Akio Fujimura, Masanao Abe, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Keisuke Nagao, Yukihiro Ishibashi, Kei Shirai, Michael E. Zolensky, Scott Sandford, Tatsuaki Okada, Masayuki Uesugi, Yuzuru Karouji, Maho Ogawa, Shogo Yakame, Munetaka Ueno, Toshifumi Mukai, Makoto Yoshikawa, Junichiro Kawaguchi

METEORITICS & PLANETARY SCIENCE　49　(2)　135-153　2014/02

DOI： 10.1111/maps.12027 　

ISSN： 1086-9379

eISSN： 1945-5100
Thermal modeling for a parent body of Itokawa Peer-reviewed

S. Wakita, T. Nakamura, T. Ikeda, H. Yurimoto

METEORITICS & PLANETARY SCIENCE　49　(2)　228-236　2014/02

DOI： 10.1111/maps.12174 　

ISSN： 1086-9379

eISSN： 1945-5100
Three-dimensional microstructure of samples recovered from asteroid 25143 Itokawa: Comparison with LL5 and LL6 chondrite particles Peer-reviewed

Akira Tsuchiyama, Masayuki Uesugi, Kentaro Uesugi, Tsukasa Nakano, Ryo Noguchi, Toru Matsumoto, Junya Matsuno, Takashi Nagano, Yuta Imai, Akira Shimada, Akihisa Takeuchi, Yoshio Suzuki, Tomoki Nakamura, Takaaki Noguchi, Masanao Abe, Toru Yada, Akio Fujimura

METEORITICS & PLANETARY SCIENCE　49　(2)　172-187　2014/02

DOI： 10.1111/maps.12177 　

ISSN： 1086-9379

eISSN： 1945-5100
Crystallization temperature determination of Itokawa particles by plagioclase thermometry with X-ray diffraction data obtained by a high-resolution synchrotron Gandolfi camera Peer-reviewed

Masahiko Tanaka, Tomoki Nakamura, Takaaki Noguchi, Aiko Nakato, Hatsumi Ishida, Toru Yada, Kei Shirai, Akio Fujimura, Yukihiro Ishibashi, Masanao Abe, Tatsuaki Okada, Munetaka Ueno, Toshifumi Mukai

METEORITICS & PLANETARY SCIENCE　49　(2)　237-244　2014/02

DOI： 10.1111/maps.12215 　

ISSN： 1086-9379

eISSN： 1945-5100
Petrographic, chemical and spectroscopic evidence for thermal metamorphism in carbonaceous chondrites I: CI and CM chondrites Peer-reviewed

Eric Tonui, Mike Zolensky, Takahiro Hiroi, Tomoki Nakamura, Michael E. Lipschutz, Ming-Sheng Wang, Kyoko Okudaira

GEOCHIMICA ET COSMOCHIMICA ACTA　126　284-306　2014/02

DOI： 10.1016/j.gca.2013.10.053 　

ISSN： 0016-7037

eISSN： 1872-9533
Mineral chemistry of MUSES-C Regio inferred from analysis of dust particles collected from the first- and second-touchdown sites on asteroid Itokawa Peer-reviewed

Tomoki Nakamura, Aiko Nakato, Hatsumi Ishida, Shigeru Wakita, Takaaki Noguchi, Michael E. Zolensky, Masahiko Tanaka, Makoto Kimura, Akira Tshuchiyama, Toshihiro Ogami, Takahito Hashimoto, Mitsuru Konno, Masayuki Uesugi, Toru Yada, Kei Shirai, Akio Fujimura, Ryuji Okazaki, Scott. A. Sandford, Yukihiro Ishibashi, Masanao Abe, Tatsuaki Okada, Munetaka Ueno, Junichiro Kawaguchi

METEORITICS & PLANETARY SCIENCE　49　(2)　215-227　2014/02

DOI： 10.1111/maps.12247 　

ISSN： 1086-9379

eISSN： 1945-5100
Impacts on airless objects under microgravity and possible related structures in Itokawa asteroid sample Peer-reviewed

Kereszturi A, Gucsik A, Nakamura T, Nishido H, Ninagawa K, Kayama M

Horizons in World Physics, Reimer, A. (Ed), Nova Science Publishers　282　21-36　2014
Effects of pressure and temperature on the silicon diffusivity of pyrope-rich garnet Peer-reviewed

Akira Shimojuku, Tomoaki Kubo, Takumi Kato, Takashi Yoshino, Masayuki Nishi, Tomoki Nakamura, Ryuji Okazaki, Yuki Kakazu

PHYSICS OF THE EARTH AND PLANETARY INTERIORS　226　28-38　2014/01

DOI： 10.1016/j.pepi.2013.11.002 　

ISSN： 0031-9201

eISSN： 1872-7395
Vortex magnetic structure in framboidal magnetite reveals existence of water droplets in an ancient asteroid Peer-reviewed

Yuki Kimura, Takeshi Sato, Norihiro Nakamura, Jun Nozawa, Tomoki Nakamura, Katsuo Tsukamoto, Kazuo Yamamoto

Nature Communications　4　2013/10/22
Publisher: Nature Publishing Group
DOI： 10.1038/ncomms3649 　

ISSN： 2041-1723
Analytical dual-energy microtomography: A new method for obtaining three-dimensional mineral phase images and its application to Hayabusa samples Peer-reviewed

A. Tsuchiyama, T. Nakano, K. Uesugi, M. Uesugi, A. Takeuchi, Y. Suzuki, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, T. Nakamura, T. Ogami, T. Noguchi, M. Abe, T. Yada, A. Fujimura

Geochimica et Cosmochimica Acta　116　5-16　2013/09/01

DOI： 10.1016/j.gca.2012.11.036 　

ISSN： 0016-7037
MET00432: Another Tagish Lake-type Carbonaceous Chondrite from Antarctica. Peer-reviewed

Nakamura T, Noguchi T, Kimura Y, Hiroi T, Ahn I, Lee J. I, Sasaki S

Meteoritics & Planetary Science　48　A258　2013
Oxygen three-isotope ratios of silicate particles returned from asteroid Itokawa by the Hayabusa spacecraft: A strong link with equilibrated LL chondrites Peer-reviewed

Daisuke Nakashima, Noriko T. Kita, Takayuki Ushikubo, Takaaki Noguchi, Tomoki Nakamura, John W. Valley

Earth and Planetary Science Letters　379　127-136　2013

DOI： 10.1016/j.epsl.2013.08.009 　

ISSN： 0012-821X
Chelyabinsk airburst, damage assessment, meteorite recovery, and characterization Peer-reviewed

Olga P. Popova, Peter Jenniskens, Vacheslav Emel'yanenko, Anna Kartashova, Eugeny Biryukov, Sergey Khaibrakhmanov, Valery Shuvalov, Yurij Rybnov, Alexandr Dudorov, Victor I. Grokhovsky, Dmitry D. Badyukov, Qing-Zhu Yin, Peter S. Gural, Jim Albers, Mikael Granvik, Läslo G. Evers, Jacob Kuiper, Vladimir Kharlamov, Andrey Solovyov, Yuri S. Rusakov, Stanislav Korotkiy, Ilya Serdyuk, Alexander V. Korochantsev, Michail Yu. Larionov, Dmitry Glazachev, Alexander E. Mayer, Galen Gisler, Sergei V. Gladkovsky, Josh Wimpenny, Matthew E. Sanborn, Akane Yamakawa, Kenneth L. Verosub, Douglas J. Rowland, Sarah Roeske, Nicholas W. Botto, Jon M. Friedrich, Michael E. Zolensky, Loan Le, Daniel Ross, Karen Ziegler, Tomoki Nakamura, Insu Ahn, Jong Ik Lee, Qin Zhou, Xian-Hua Li, Qiu-Li Li, Yu Liu, Guo-Qiang Tang, Takahiro Hiroi, Derek Sears, Ilya A. Weinstein, Alexander S. Vokhmintsev, Alexei V. Ishchenko, Phillipe Schmitt-Kopplin, Norbert Hertkorn, Keisuke Nagao, Makiko K. Haba, Mutsumi Komatsu, Takashi Mikouchi

Science　342　(6162)　1069-1073　2013
Publisher: American Association for the Advancement of Science
DOI： 10.1126/science.1242642 　

ISSN： 1095-9203 0036-8075

eISSN： 1095-9203
Heavily metamorphosed clasts from the CV chondrite breccias Mokoia and Yamato-86009 Peer-reviewed

Kaori Jogo, Kazuhide Nagashima, Ian D. Hutcheon, Alexander N. Krot, Tomoki Nakamura

METEORITICS & PLANETARY SCIENCE　47　(12)　2251-2268　2012/12

DOI： 10.1111/maps.12042 　

ISSN： 1086-9379
Compositional evidence for an impact origin of the Moon's Procellarum basin Peer-reviewed

Ryosuke Nakamura, Satoru Yamamoto, Tsuneo Matsunaga, Yoshiaki Ishihara, Tomokatsu Morota, Takahiro Hiroi, Hiroshi Takeda, Yoshiko Ogawa, Yasuhiro Yokota, Naru Hirata, Makiko Ohtake, Kazuto Saiki

NATURE GEOSCIENCE　5　(11)　775-778　2012/11

DOI： 10.1038/NGEO1614 　

ISSN： 1752-0894
Deep-sea record of impact apparently unrelated to mass extinction in the Late Triassic Peer-reviewed

Tetsuji Onoue, Honami Sato, Tomoki Nakamura, Takaaki Noguchi, Yoshihiro Hidaka, Naoki Shirai, Mitsuru Ebihara, Takahito Osawa, Yuichi Hatsukawa, Yosuke Toh, Mitsuo Koizumi, Hideo Harada, Michael J. Orchard, Munetomo Nedachi

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　109　(47)　19134-19139　2012/11

DOI： 10.1073/pnas.1209486109 　

ISSN： 0027-8424
Diverse mineralogical and oxygen isotopic signatures recorded in CV3 carbonaceous chondrites Peer-reviewed

Hatsumi Ishida, Tomoki Nakamura, Hitoshi Miura, Yuki Kakazu

POLAR SCIENCE　6　(3-4)　252-262　2012/08

DOI： 10.1016/j.polar.2012.06.002 　

ISSN： 1873-9652
An Attempt to Identify Minerals in the Itokawa Dust Particles by Micro-Raman Spectroscopy Peer-reviewed

Noguchi Takaaki, Kimura Makoto, Nakamura Tomoki, Kitajima Tomio, Tsuchiyama Akira, Abe Masanao, Fujimura Akio, Mukai Toshifumi, Okada Tatsuaki, Ueno Munetaka, Yada Toru, Ishibashi Yukihiro, Shirai Kei, Okazaki Ryuji

BUNSEKI KAGAKU　61　(4)　299-310　2012/04

DOI： 10.2116/bunsekikagaku.61.299 　

ISSN： 0525-1931
Proposed mission to asteroid Phaethon and the scientific significance

Arai T, Kasuga T, Otsuka K, Nakamura T, Nakato A, Nakamura R, Ito T, Watanabe J, Kobayashi M, Kawakatsu Y, Nakamura-Messenger K, Komatsu M, Senshu H, Wada K, Kameda S, Ohno S, Ishibashi K, Ishimaru R, Nakamiya M

Proceedings of the 45th ISAS Lunar and Planetary Symposium　2012
Preliminary organic compound analysis of microparticles returned from Asteroid 25143 Itokawa by the Hayabusa mission Peer-reviewed

H. Naraoka, H. Mita, K. Hamase, M. Mita, H. Yabuta, K. Saito, K. Fukushima, F. Kitajima, S. A. Sandford, T. Nakamura, T. Noguchi, R. Okazaki, K. Nagao, M. Ebihara, H. Yurimoto, A. Tsuchiyama, M. Abe, K. Shirai, M. Ueno, T. Yada, Y. Ishibashi, T. Okada, A. Fujimura, T. Mukai, M. Yoshikawa, J. Kawaguchi

GEOCHEMICAL JOURNAL　46　(1)　61-72　2012

DOI： 10.2343/geochemj.1.0134 　

ISSN： 0016-7002

eISSN： 1880-5973
Do Meteoroids Originating from Near-Earth Asteroid (25143) Itokawa Exist? Peer-reviewed

Katsuhito Ohtsuka, Shinsuke Abe, Takashi Ito, Tomoki Nakamura, Masanao Abe, Hajime Yano, Jun-ichi Watanabe

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　63　(6)　L73-L77　2011/12

DOI： 10.1093/pasj/63.6.L73 　

ISSN： 0004-6264

eISSN： 2053-051X
A chondrule-like object captured by space-exposed aerogel on the international space station Peer-reviewed

T. Noguchi, T. Nakamura, T. Ushikubo, N. T. Kita, J. W. Valley, R. Yamanaka, Y. Kimoto, Y. Kitazawa

EARTH AND PLANETARY SCIENCE LETTERS　309　(3-4)　198-206　2011/09

DOI： 10.1016/j.epsl.2011.06.032 　

ISSN： 0012-821X
Oxygen isotopic compositions of asteroidal materials returned from Itokawa by the Hayabusa mission. International-journal Peer-reviewed

Hisayoshi Yurimoto, Ken-ichi Abe, Masanao Abe, Mitsuru Ebihara, Akio Fujimura, Minako Hashiguchi, Ko Hashizume, Trevor R Ireland, Shoichi Itoh, Juri Katayama, Chizu Kato, Junichiro Kawaguchi, Noriyuki Kawasaki, Fumio Kitajima, Sachio Kobayashi, Tatsuji Meike, Toshifumi Mukai, Keisuke Nagao, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Changkun Park, Naoya Sakamoto, Yusuke Seto, Masashi Takei, Akira Tsuchiyama, Masayuki Uesugi, Shigeyuki Wakaki, Toru Yada, Kosuke Yamamoto, Makoto Yoshikawa, Michael E Zolensky

Science (New York, N.Y.)　333　(6046)　1116-9　2011/08/26

DOI： 10.1126/science.1207776 　

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Meteorite studies suggest that each solar system object has a unique oxygen isotopic composition. Chondrites, the most primitive of meteorites, have been believed to be derived from asteroids, but oxygen isotopic compositions of asteroids themselves have not been established. We measured, using secondary ion mass spectrometry, oxygen isotopic compositions of rock particles from asteroid 25143 Itokawa returned by the Hayabusa spacecraft. Compositions of the particles are depleted in (16)O relative to terrestrial materials and indicate that Itokawa, an S-type asteroid, is one of the sources of the LL or L group of equilibrated ordinary chondrites. This is a direct oxygen-isotope link between chondrites and their parent asteroid.
Three-dimensional structure of Hayabusa samples: origin and evolution of Itokawa regolith. International-journal Peer-reviewed

Akira Tsuchiyama, Masayuki Uesugi, Takashi Matsushima, Tatsuhiro Michikami, Toshihiko Kadono, Tomoki Nakamura, Kentaro Uesugi, Tsukasa Nakano, Scott A Sandford, Ryo Noguchi, Toru Matsumoto, Junya Matsuno, Takashi Nagano, Yuta Imai, Akihisa Takeuchi, Yoshio Suzuki, Toshihiro Ogami, Jun Katagiri, Mitsuru Ebihara, Trevor R Ireland, Fumio Kitajima, Keisuke Nagao, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Hisayoshi Yurimoto, Michael E Zolensky, Toshifumi Mukai, Masanao Abe, Toru Yada, Akio Fujimura, Makoto Yoshikawa, Junichiro Kawaguchi

Science (New York, N.Y.)　333　(6046)　1125-8　2011/08/26

DOI： 10.1126/science.1207807 　

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Regolith particles on the asteroid Itokawa were recovered by the Hayabusa mission. Their three-dimensional (3D) structure and other properties, revealed by x-ray microtomography, provide information on regolith formation. Modal abundances of minerals, bulk density (3.4 grams per cubic centimeter), and the 3D textures indicate that the particles represent a mixture of equilibrated and less-equilibrated LL chondrite materials. Evidence for melting was not seen on any of the particles. Some particles have rounded edges. Overall, the particles' size and shape are different from those seen in particles from the lunar regolith. These features suggest that meteoroid impacts on the asteroid surface primarily form much of the regolith particle, and that seismic-induced grain motion in the smooth terrain abrades them over time.
Irradiation history of Itokawa regolith material deduced from noble gases in the Hayabusa samples. International-journal Peer-reviewed

Keisuke Nagao, Ryuji Okazaki, Tomoki Nakamura, Yayoi N Miura, Takahito Osawa, Ken-ichi Bajo, Shintaro Matsuda, Mitsuru Ebihara, Trevor R Ireland, Fumio Kitajima, Hiroshi Naraoka, Takaaki Noguchi, Akira Tsuchiyama, Hisayoshi Yurimoto, Michael E Zolensky, Masayuki Uesugi, Kei Shirai, Masanao Abe, Toru Yada, Yukihiro Ishibashi, Akio Fujimura, Toshifumi Mukai, Munetaka Ueno, Tatsuaki Okada, Makoto Yoshikawa, Junichiro Kawaguchi

Science (New York, N.Y.)　333　(6046)　1128-31　2011/08/26

DOI： 10.1126/science.1207785 　

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Noble gas isotopes were measured in three rocky grains from asteroid Itokawa to elucidate a history of irradiation from cosmic rays and solar wind on its surface. Large amounts of solar helium (He), neon (Ne), and argon (Ar) trapped in various depths in the grains were observed, which can be explained by multiple implantations of solar wind particles into the grains, combined with preferential He loss caused by frictional wear of space-weathered rims on the grains. Short residence time of less than 8 million years was implied for the grains by an estimate on cosmic-ray-produced (21)Ne. Our results suggest that Itokawa is continuously losing its surface materials into space at a rate of tens of centimeters per million years. The lifetime of Itokawa should be much shorter than the age of our solar system.
Neutron Activation Analysis of a Particle Returned from Asteroid Itokawa Peer-reviewed

M. Ebihara, S. Sekimoto, N. Shirai, Y. Hamajima, M. Yamamoto, K. Kumagai, Y. Oura, T. R. Ireland, F. Kitajima, K. Nagao, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, A. Tsuchiyama, M. Uesugi, H. Yurimoto, M. E. Zolensky, M. Abe, A. Fujimura, T. Mukai, Y. Yada

SCIENCE　333　(6046)　1119-1121　2011/08

DOI： 10.1126/science.1207865 　

ISSN： 0036-8075
Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles Peer-reviewed

T. Noguchi, T. Nakamura, M. Kimura, M. E. Zolensky, M. Tanaka, T. Hashimoto, M. Konno, A. Nakato, T. Ogami, A. Fujimura, M. Abe, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi, R. Okazaki

SCIENCE　333　(6046)　1121-1125　2011/08

DOI： 10.1126/science.1207794 　

ISSN： 0036-8075
Itokawa Dust Particles: A Direct Link Between S-Type Asteroids and Ordinary Chondrites Peer-reviewed

Tomoki Nakamura, Takaaki Noguchi, Masahiko Tanaka, Michael E. Zolensky, Makoto Kimura, Akira Tsuchiyama, Aiko Nakato, Toshihiro Ogami, Hatsumi Ishida, Masayuki Uesugi, Toru Yada, Kei Shirai, Akio Fujimura, Ryuji Okazaki, Scott A. Sandford, Yukihiro Ishibashi, Masanao Abe, Tatsuaki Okada, Munetaka Ueno, Toshifumi Mukai, Makoto Yoshikawa, Junichiro Kawaguchi

SCIENCE　333　(6046)　1113-1116　2011/08

DOI： 10.1126/science.1207758 　

ISSN： 0036-8075
A PRELIMINARY MICRO-SPECTROSCOPIC ANALYSIS OF THE CARBONACEOUS MATTER IN THE PARTICLES RECOVERED BY THE HAYABUSA MISSION Peer-reviewed

F. Kitajima, M. Kotsugi, T. Ohkochi, H. Naraoka, Y. Ishibashi, M. Abe, A. Fujimura, R. Okazaki, T. Yada, T. Nakamura, T. Noguchi, K. Nagao, A. Tsuchiyama, H. Yurimoto, M. Ebihara, T. Mukai, S. A. Sandford, T. Okada, K. Shirai, M. Ueno, M. Yoshikawa, J. Kawaguchi

METEORITICS & PLANETARY SCIENCE　46　A126-A126　2011/07

ISSN： 1086-9379
Magnetite 3D Colloidal Crystals Formed in the Early Solar System 4.6 Billion Years Ago Peer-reviewed

Jun Nozawa, Katsuo Tsukamoto, Willem van Enckevort, Tomoki Nakamura, Yuki Kimura, Hitoshi Miura, Hisao Satoh, Ken Nagashima, Makoto Konoto

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY　133　(23)　8782-8785　2011/06

DOI： 10.1021/ja2005708 　

ISSN： 0002-7863

eISSN： 1520-5126
Composition and accretion rate of fossil micrometeorites recovered in Middle Triassic deep-sea deposits Peer-reviewed

Tetsuji Onoue, Tomoki Nakamura, Takeshi Haranosono, Chika Yasuda

GEOLOGY　39　(6)　567-570　2011/06

DOI： 10.1130/G31866.1 　

ISSN： 0091-7613
Application of Multi-Disciplinary Analyses of Planetary Materials for Crystal Evaluation Peer-reviewed

NOGUCHI Takaaki, NAKAMURA Tomoki, TANAKA Masahiko

Nihon Kessho Gakkaishi　53　(1)　70-75　2011
Publisher: The Crystallographic Society of Japan
DOI： 10.5940/jcrsj.53.70 　

ISSN： 0369-4585

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We have improved the application of multi-disciplinary methods for crystal evaluation of fine-grained planetary materials : micrometeorites, a small particular portion of a meteorite, fine-grained samples retrieved from Wild2 comet and Asteroid Itokawa, and so on. In this paper, we give an example of the application of multi-disciplinary methods when we investigated secondary minerals in nakhlite Martian meteorites retrieved from Yamato Mountains, Antarctica. We also touch upon an issue of sample preparation and analysis of fine-grained dust retrieved from Asteroid Itokawa.
Single grain noble gas analysis of Antarctic micrometeorites by stepwise heating method with a newly constructed miniature furnace Peer-reviewed

Ken-ichi Bajo, Tomohiro Akaida, Noriaki Ohashi, Takaaki Noguchi, Tomoki Nakamura, Yoshinobu Nakamura, Hirochika Sumino, Keisuke Nagao

EARTH PLANETS AND SPACE　63　(10)　1097-1111　2011

DOI： 10.5047/eps.2011.08.001 　

ISSN： 1880-5981
X-ray diffraction analysis of Itokawa regolith particles returned by Hayabusa space mission

Nakamura T, Nakato A, Ogami T, Ishida H, Kakazu Y, Tanaka M, Zolensky M. E

Photon Factory Activity Report 2010 Part B: Users' Report　208　2011
Effects of hydrogen and iron on the silicon diffusivity of wadsleyite Peer-reviewed

Akira Shimojuku, Tomoaki Kubo, Eiji Ohtani, Tomoki Nakamura, Ryuji Okazaki

PHYSICS OF THE EARTH AND PLANETARY INTERIORS　183　(1-2)　175-182　2010/11

DOI： 10.1016/j.pepi.2010.09.011 　

ISSN： 0031-9201
Heavily fractionated noble gases in an acid residue from the Klein Glacier 98300 EH3 chondrite Peer-reviewed

Daisuke Nakashima, Ulrich Ott, Ahmed El Goresy, Tomoki Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA　74　(17)　5134-5149　2010/09

DOI： 10.1016/j.gca.2010.06.006 　

ISSN： 0016-7037
Three-dimensional shapes and Fe contents of Stardust impact tracks: A track formation model and estimation of comet Wild 2 coma dust particle densities Peer-reviewed

Yosuke Iida, Akira Tsuchiyama, Toshihiko Kadono, Kanako Sakamoto, Tomoki Nakamura, Kentaro Uesugi, Tsukasa Nakano, Michael E. Zolensky

METEORITICS & PLANETARY SCIENCE　45　(8)　1302-1319　2010/08

DOI： 10.1111/j.1945-5100.2010.01091.x 　

ISSN： 1086-9379
小惑星イトカワに存在する岩塊の表面組織の解読 Peer-reviewed

野口高明, 平田成, 土'山明, 出村裕英, 中村良介, 宮本英昭, 矢野創, 中村智樹, 齋藤潤, 佐々木晶, 橋本樹明, 久保田孝, 石黒正晃, マイケル・E・ゾレンスキー

遊・星・人（日本惑星科学会誌）　19　(1)　12-22　2010/03
Surface morphological features of boulders on Asteroid 25143 Itokawa Peer-reviewed

Takaaki Noguchi, Akira Tsuchiyama, Naru Hirata, Hirohide Demura, Ryosuke Nakamura, Hideaki Miyamoto, Hajime Yano, Tomoki Nakamura, Jun Saito, Sho Sasaki, Tatsuaki Hashimoto, Takashi Kubota, Masateru Ishiguro, Michael E. Zolensky

ICARUS　206　(1)　319-326　2010/03

DOI： 10.1016/j.icarus.2009.09.002 　

ISSN： 0019-1035
Noble gases in enstatite chondrites released by stepped crushing and heating Peer-reviewed

Ryuji Okazaki, Nobuo Takaoka, Keisuke Nagao, Tomoki Nakamura

METEORITICS & PLANETARY SCIENCE　45　(3)　339-360　2010/03

DOI： 10.1111/j.1945-5100.2010.01025.x 　

ISSN： 1086-9379
A new variant of saponite-rich micrometeorites recovered from recent Antarctic snowfall Peer-reviewed

Kanako Sakamoto, Tomoki Nakamura, Takaaki Noguchi, Akira Tsuchiyama

METEORITICS & PLANETARY SCIENCE　45　(2)　220-237　2010/02

DOI： 10.1111/j.1945-5100.2010.01019.x 　

ISSN： 1086-9379
Carbon polymorphism in shocked meteorites: Evidence for new natural ultrahard phases Peer-reviewed

Tristan Ferroir, Leonid Dubrovinsky, Ahmed El Goresy, Alexandre Simionovici, Tomoki Nakamura, Philippe Gillet

EARTH AND PLANETARY SCIENCE LETTERS　290　(1-2)　150-154　2010/02

DOI： 10.1016/j.epsl.2009.12.015 　

ISSN： 0012-821X
Two extraterrestrial dust horizons found in Dome Fuji ice core, East Antarctica Peer-reviewed

Misawa, K, Kohno, M. Tomiyama, T, Noguchi, T, Nakamura, T, Nagao, K, Mikouchi, T, Nishiizumi, T

Earth Planet. Sci. Lett.　289　287-297　2010

DOI： 10.1016/j.epsl.2009.11.016 　
Laihunite and jarosite in the Yamato 00 nakhlites: Alteration products on Mars? Peer-reviewed

Takaaki Noguchi, Tomoki Nakamura, Keiji Misawa, Naoya Imae, Tomoaki Aoki, Shoichi Toh

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS　114　2009/10

DOI： 10.1029/2009JE003364 　

ISSN： 0148-0227
Si and O diffusion in (Mg,Fe)(2)SiO4 wadsleyite and ringwoodite and its implications for the rheology of the mantle transition zone Peer-reviewed

Akira Shimojuku, Tomoaki Kubo, Eiji Ohtani, Tomoki Nakamura, Ryuji Okazaki, Ralf Dohmen, Sumit Chakraborty

EARTH AND PLANETARY SCIENCE LETTERS　284　(1-2)　103-112　2009/06

DOI： 10.1016/j.epsl.2009.04.014 　

ISSN： 0012-821X

eISSN： 1385-013X
Fine-grained materials in enstatite chondrites.

okazaki ryuji, nakamura tomoki

Abstracts of Annual Meeting of the Geochemical Society of Japan　56　75-75　2009
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.56.0.75.0 　

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In order to elucidate the primitive materials and evolution history of enstatite (E) chondrites, we have investigate EH3, EH4 and EL4 chondrites using optical/electron microscopes and a laser Raman microscope. Matrix and chondrule rims in an EH3 chondrite pair, Sahara 97096/97158/97121, consist of fine-grained (<20 micrometer) materials, such as enstatite, troilite, FeNi metal, SiO2 (cristobalite), graphite and niningerite. The matrix and rims show variations in sizes of their constituent minerals and in the mineralogy. A chondrule rim contacts with a FeNi metal/troilite lump containing enstatite lath. These features suggest that the Sahara EH3 chondrite could be a primitive breccia forming through re-accumulation of the fine-grained primitive materials and secondary materials that have been produced by impact shock heating prior to the final accumulation.
南極とっつき岬で回収されたサイズフラクション100-238ミクロンの宇宙塵の物質科学的特徴

山内祐司, 中村智樹, 𡈽山明, 野口高明

日本地球化学会年会要旨集　56　73-73　2009
Publisher: 日本地球化学会
DOI： 10.14862/geochemproc.56.0.73.0 　

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南極とっつき岬で回収された宇宙塵の物質科学的特徴を明らかにし、酸素同位体組成を測定することで小惑星や彗星、および隕石との関連を明らかにすることを目的とした。100ミクロン以下のサイズの宇宙塵試料では約１％の存在度で発見される層状ケイ酸塩を含む試料は、本研究で分析した大きなサイズの宇宙塵からは見つからなかった。しかし鉱物組成等から、溶融度の低い試料の多くは層状ケイ酸塩が脱水分解した物質で構成され、含水天体起源であることがわかった。
Two extraterrestrial dust horizons found in Dome Fuji ice core, East Antarctica

Misawa Keiji, Kohno Mika

Abstracts of Annual Meeting of the Geochemical Society of Japan　56　111-111　2009
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.56.0.111.0 　

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Two silicate-rich dust layers, lie respectively at Marine Isotope Stages 12 and 13, were found in Dome Fuji ice cores in East Antarctica. Morphologies, textures, and chemical compositions of constituent particles reveal that they are high-temperature melting products and are of extraterrestrial origin. The two extraterrestrial horizons, each a few millimeters in thickness, represent regional or global meteoritic/cometary events not identified previously in the Southern Hemisphere. These findings will be help to understand the nature of accreted materials to Earth, the flux of extraterrestrial materials at the Earth's surface, and regional climate changes which triggered by large impact explosions on polar ice sheets or by fallout of huge amounts of extraterrestrial dust particles on polar ice.
Chondrules in short-period comet 81P/Wild 2 recovered by the Stardust mission

NAKAMURA Tomoki, NOGUCHI Takaaki, TSUCHIYAMA Akira, USHIKUBO Takayuki, KITA Noriko T., VALLEY John W., ZOLENSKY Michael E., KAKAZU Yuki, SAKAMOTO Kanako, MASHIO Etsuko, UESUGI Kentaro, NAKANO Tsukasa

Chikyukagaku　43　(4)　143-153　2009
Publisher: The Geochemical Society of Japan
DOI： 10.14934/chikyukagaku.43.143 　

ISSN： 0386-4073

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Many small rock particles have been successfully recovered from a short-period comet 81P/Wild 2 by the Stardust mission. They are believed to be very primitive dust at outer regions of the protoplanetary disk, because short-period comets originally formed as Kuiper-belt objects that currently locate at 30-50 AU from the Sun. Chondrules are sub-millimeter to millimeter size objects formed in the inner protoplanetary disk by total or partial melting of silicate-rich dust particles. They are a major constituent of chondrites from asteroids. Among the particles from the comet Wild 2, we found pieces of chondrules that show igneous texture and have mineral compositions and major and most minor element concentrations very similar to chondrules in primitive meteorites derived from asteroids. Oxygen isotope ratios are highly heterogeneous from - 50 to + 5‰ in δ¹⁸O_SMOW and plotted nearly along the slope = 1 mass independent fractionation line in the oxygen three isotope diagram, which characterizes chondrules in carbonaceous chondrites that comprise middle to outer asteroid belt. These observations suggest that the particles are pieces of chondrules formed through the least degree of melting, crystallization, and elemental and isotopic equilibration at high temperatures. The presence of chondrules in a short-period comet from the Kuiper belt indicates that chondrules migrated from hot inner regions to cold outer regions of the disk and spread widely over the early solar nebula.
Solar-radiation heating effects on 3200 phaethon Peer-reviewed

Katsuhito Ohtsuka, Aiko Nakato, Tomoki Nakamura, Daisuke Kinoshita, Takashi Ito, Makoto Yoshikawa, Sunao Hasegawa

Publications of the Astronomical Society of Japan　61　(6)　1375-1387　2009
Publisher: Astronomical Society of Japan
DOI： 10.1093/pasj/61.6.1375 　

ISSN： 0004-6264
Fayalite in the Vigarano CV3 carbonaceous chondrite: Occurrences, formation age and conditions. Peer-reviewed

Jogo, K, Nakamura, T, Noguchi, T, Zolotov, M

Earth Planet. Sci. Lett.　287　320-328　2009

DOI： 10.1016/j.epsl.2009.08.014 　
Chondrulelike objects in short-period comet 81P/Wild 2 Peer-reviewed

Tomoki Nakamura, Takaaki Noguchi, Akira Tsuchiyama, Takayuki Ushikubo, Noriko T. Kita, John W. Valley, Michael E. Zolensky, Yuki Kakazu, Kanako Sakamoto, Etsuko Mashio, Kentaro Uesugi, Tsukasa Nakano

SCIENCE　321　(5896)　1664-1667　2008/09

DOI： 10.1126/science.1160995 　

ISSN： 0036-8075
Stardust in Antarctic micrometeorites Peer-reviewed

Toru Yada, Christine Floss, Frank J. Stadermann, Ernst Zinner, Tomoki Nakamura, Takaaki Noguchi, A. Scott Lea

METEORITICS & PLANETARY SCIENCE　43　(8)　1287-1298　2008/08

DOI： 10.1111/j.1945-5100.2008.tb00698.x 　

ISSN： 1086-9379

eISSN： 1945-5100
Kinetic stability of a melted iron globule during chondrule formation. I. Non-rotating model Peer-reviewed

Uesugi Masayuki, Sekiya Minoru, Nakamura Tomoki

METEORITICS & PLANETARY SCIENCE　43　(4)　717-730　2008/04

DOI： 10.1111/j.1945-5100.2008.tb00680.x 　

ISSN： 1086-9379
短周期彗星８１Ｐ/ビルト第２彗星から回収されたコンドリュール

中村智樹, 野口高明, 土`山明, 牛久保孝行, 木多紀子, バレージョン, ゾレンスキーマイケル, 嘉数勇基, 坂本佳奈子, 増尾悦子, 上杉健太朗, 中野司

日本地球化学会年会要旨集　55　174-174　2008
Publisher: 日本地球化学会
DOI： 10.14862/geochemproc.55.0.174.0 　

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スターダスト計画により回収された塵からコンドリュールと考えられる塵を６試料発見した。すべての試料は結晶質で火成岩的組織を示し、構成物質はＭｇに富むカンラン石、輝石、Ａｌ、Ｃａ，Ｓｉに富むガラスである。一部の試料にＦｅＮｉ金属、クロムスピネル、斜長石などが観察された。酸素同位体比は結晶粒子間の不均質が顕著で、ＣＣＡＭ線上に沿ってδ１８Ｏで≠T０～＋５‰まで広く分布し、炭素質コンドライトのコンドリュールの酸素同位体比の範囲と完全に重なることがわかった。したがって、彗星コンドリュールは、小惑星帯中央から外側部分に多く存在する炭素質コンドライトのコンドリュールと密接な成因関係があることがわかった。
Noble gas analyses of small extraterrestrial samples

Nagao Keisuke, Bajo Kenichi, Okazaki Ryuji, Nakamura Tomoki

Abstracts of Annual Meeting of the Geochemical Society of Japan　55　183-183　2008
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.55.0.183.0 　

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We will present an outline of results expected from noble gas analyses on small extraterrestrial samples obtained by sample return missions. Methods of extremely small amounts of noble gases, detection limits with our noble gas mass spectrometers, and treatment of small samples will be presented.
Three-dimensional structures of impact tracks of cometary dust

Iida Yousuke, Tsuchiyama Akira, Nakamura Tomoki, Sakamoto Kanako, Kadono Toshihiko, Nakano Tsukasa, Uesugi Kentarou

Abstracts of Annual Meeting of the Geochemical Society of Japan　55　176-176　2008
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.55.0.176.0 　
Preliminary examination of Hayabusa samples using synchrotron radiation imaging.

Tsuchiyama Akira, Uesugi Kentarou, Nakano Tsukasa, Nakamura Tomoki, Noguchi Takaaki

Abstracts of Annual Meeting of the Geochemical Society of Japan　55　287-287　2008
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.55.0.287.0 　

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Preliminay examination of Hayabusa sample using synchrotron imaging analyses (x-ray microtomography and radiography with subtaction method) will be described.
Mineralogical and Petrological analyses of samples retrieved by Hayabusa mission and expected results

Noguchi Takaaki, Nakamura Tomoki, Tanaka Masahiko

Abstracts of Annual Meeting of the Geochemical Society of Japan　55　288-288　2008
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.55.0.288.0 　
Mineralogical characteristics and oxygen isotope ratios of chondrules in the comet Wild 2

Nakamura Tomoki, Noguchi Takaaki, Tsuchiyama Akira, Ushikubo Takayuki, Kita Noriko, Valley John, Zolensky Michael, Kakazu Yuki, Sakamoto Kanako, Mashio Etsuko, Uesugi Kentaro, Nakano Tsukasa

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2008　203-203　2008
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.14824/jakoka.2008.0.203.0 　

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Among particles ejected from the short-period comet 81P/Wild 2, we found six crystalline particles apparently formed by flash-melting at high temperature, showing igneous texture, mineral compositions, and major and most minor element concentrations that are very similar to chondrules in primitive meteorites derived from asteroids. Oxygen isotope ratios show a wide range of values from −50 to +5‰ in δ18O nearly along the slope=1 mass independent fractionation line which characterizes chondrules in carbonaceous chondrites that comprise the outer asteroid belt. The presence of chondrules in a short-period comet from the Kuiper belt indicates that chondrules had spread widely over the early solar nebula from inner asteroidal regions to the cold outer regions.
Three-dimensional morphologies of Stardust impact tracks and their Fe distributions

Tsuchiyama Akira, Iida Yosuke, Nakamura Tomoki, Sakamoto Kanako, Kadono Toshihiko, Uesugi Kentaro, Nakano Tsukasa, Zolensky Mike

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2008　204-204　2008
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.14824/jakoka.2008.0.204.0 　

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Dust from comet Wild-2 was captured in Stardust mission by NASA. Impact tracks were formed by hyper velocity impact of cometary dust into silica aerogel collectors with very low density. We have investigated the quantitative 3-D structures and Fe masses of impact tracks by microtomography and XRF using SR at SPring-8 to estimate original features of the cometary dust particles.
Origin and formation of iron silicide phases in the aerogel of the Stardust mission Peer-reviewed

Frans J. M. Rietmeijer, Tomoki Nakamura, Akira Tsuchiyama, Kentaro Uesugi, Tsukasa Nakano, Hugues Leroux

METEORITICS & PLANETARY SCIENCE　43　(1-2)　121-134　2008/01

DOI： 10.1111/j.1945-5100.2008.tb00613.x 　

ISSN： 1086-9379

eISSN： 1945-5100
Bulk mineralogy and three-dimensional structures of individual Stardust particles deduced from synchrotron X-ray diffraction and microtomography analysis. Peer-reviewed

Nakamura, T, Tsuchiyama, A, Akaki, T, Uesugi, K, Nakano, T, Takeuchi, A, Suzuki, Y, Noguchi, T

Meteoritics Planet. Sci.　43　247-260　2008
Evaluation of dehydration mechanism during heating of hydrous asteroids based on mineralogical and chemical analysis of naturally and experimentally heated CM chondrites. Peer-reviewed

Nakato, A, Nakamura, T, Kitajima, F, Noguchi, T

Earth Planet. Sci.　60　(8)　855-864　2008
Publisher:
DOI： 10.1186/BF03352837 　

ISSN： 1343-8832
He-Ar and Nd-Sr isotopic compositions of late Pleistocene felsic plutonic back arc basin rocks from Ulleungdo volcanic island, South Korea: Implications for the genesis of young plutonic rocks in a back arc basin Peer-reviewed

Kim K.H, Nagao K, Sumino H, Tanaka T, Hayashi T, Nakamura T, Lee J.I

Chemical Geology　253　(3-4)　180-195　2008

DOI： 10.1016/j.chemgeo.2008.05.009 　
Comparing Wild 2 particles to chondrites and IDPs Peer-reviewed

Zolensky Michael, Nakamura-Messenger Keiko, Rietmeijer Frans, Leroux Hugues, Mikouchi Takashi, Ohsumi Kazumasa, Simon Steven, Grossman Lawrence, Stephan Thomas, Weisberg Michael, Velbel Michael, Zega Thomas, Stroud Rhonda, Tomeoka Kazushige, Ohnishi Ichiro, Tomioka Naotaka, Nakamura Tomoki, Matrajt Graciela, Joswiak David, Brownlee Donald, Langenhorst Falko, Krot Alexander, Kearsley Anton, Ishii Hope, Graham Giles, Da Zu Rong, Ch Miaofang, Bradley John, Hagiya Kenji, Gounelle Matthieu, Keller Lindsay, Bridges John

Meteoritics & Planetary Science　43　(1-2)　261-272　2008
Thermal alteration of hydrated minerals during hypervelocity capture to silica aerogel at the flyby speed of Stardust Peer-reviewed

Noguchi Takaaki, Nakamura Tomoki, Okudaira Kyoko, Yano Hajime, Sugita Seiji, Burchell Mark J

METEORITICS & PLANETARY SCIENCE　42　(3)　357-372　2007/03

DOI： 10.1111/j.1945-5100.2007.tb00239.x 　

ISSN： 1086-9379
Multiple Formation of Chondrules in the Early Solar System: Chronology of a Compound Al-rich Chondrule. Peer-reviewed

Akaki, T, Nakamura, T, Noguchi, T, Tsuchiyama, A

Astrophy. J., pt. 2　656　L29–L32　2007

DOI： 10.1086/512100 　
Crystallization Experiments of Amorphous Silicates with the Chondritic Composition: Quantitative Formulation of the Crystallization. Peer-reviewed

Murata, K, Chihara, H, Tsuchiyama, A, Koike, C, Takakura, T, Noguchi, T, Nakamura, T

Astrophys. J.　668　2007

DOI： 10.1086/521017 　
Application of the quantitative-phase and crystal-structure simultaneous analysis of the X-ray diffraction data obtained by synchrotron Gandolfi camera system. Peer-reviewed

Tanaka M, Nakamura T, Noguchi T

CP879, Synchrotron Radiation Instrumentation: Ninth International Conference. (ed. Jae-Young Choi and Seugyun Rah), American Institute of Physics.　1779-1783　2007
Elemental compositions of comet 81P/wild 2 samples collected by stardust Peer-reviewed

George J. Flynn, Pierre Bleuet, Janet Borg, John P. Bradley, Frank E. Brenker, Sean Brennen, John Bridges, Don E. Brownlee, Emma S. Bullock, Manfred Burghammer, Benton C. Clark, Zu Rong Dai, Charles P. Daghlian, Zahia Djouadi, Sirine Fakra, Tristan Ferroir, Christine Floss, Ian A. Franchi, Zack Gainsforth, Jean-Paul Gallien, Philippe Gillet, Patrick G. Grant, Giles A. Graham, Simon F. Green, Faustine Grossemy, Philipp R. Heck, Gregory F. Herzog, Peter Hoppe, Friedrich Hörz, Joachim Huth, Konstantin Ignatyev, Hope A. Ishii, Koen Janssens, David Joswiak, Anton T. Kearsley, Hicham Khodja, Antonio Lanzirotti, Jan Leitner, Laurence Lemelle, Hugues Leroux, Katharina Luening, Glenn J. MacPherson, Kuljeet K. Marhas, Matthew A. Marcus, Graciela Matrajt, Tomoki Nakamura, Keiko Nakamura-Messenger, Tsukasa Nakano, Matthew Newville, Dimitri A. Papanastassiou, Piero Pianetta, William Rao, Christian Riekel, Frans J. M. Rietmeijer, Detlef Rost, Craig S. Schwandt, Thomas H. See, Julie Sheffield-Parker, Alexandre Simionovici, Ilona Sitnitsky, Christopher J. Snead, Frank J. Stadermann, Thomas Stephan, Rhonda M. Stroud, Jean Susini, Yoshio Suzuki, Stephen R. Sutton, Susan Taylor, Nick Teslich, D. Troadec, Peter Tsou, Akira Tsuchiyama, Kentaro Uesugi, Bart Vekemans, Edward P. Vicenzi, Laszlo Vincze, Andrew J. Westphal, Penelope Wozniakiewicz, Ernst Zinner, Michael E. Zolensky

Science　314　(5806)　1731-1735　2006/12/15

DOI： 10.1126/science.1136141 　

ISSN： 0036-8075 1095-9203
Mineralogy and Petrology of Comet 81P/Wind 2 Nucleus Samples Peer-reviewed

ZOLENSKY Michael E, ZEGA Thomas J, YANO Hajime, WIRICK Sue, WESTPHAL, Andrew J, WEISBERG Mike K, WEBER Iris, WARREN Jack L, VELBEL Michael A, TSUCHIYAMA Akira, TSOU Peter, TOPPANI Alice, TOPPANI Alice, TOMIOKA Naotaka, TOMEOKA Kazushige, TESLICH Nick, TAHERI Mitra, SUSINI Jean, STROUD Rhonda, STEPHAN Thomas, STADERMANN, Frank J, SNEAD Christopher J, SIMON Steven B, SIMIONOVICI Alexandre, SEE Thomas H, ROBERT Francois, RIETMEIJER, Frans J.M, RAO William, PERRONNET Murielle C, PAPANASTASSIOU, Dimitri A, OKUDAIRA Kyoko, OHSUMI Kazumasa, OHNISHI Ichiro, NAKAMURA‐MESSENGER Keiko, NAKAMURA Tomoki, MOSTEFAOUI Smail, MIKOUCHI Takashi, MEIBOM Anders, MATRAJT Graciela, MARCUS Matthew A

Science　314　(5806)　1735-1739　2006/12/15

DOI： 10.1126/science.1135842 　

ISSN： 0036-8075 1095-9203

eISSN： 1095-9203
Comet 81P/Wild 2 under a microscope. International-journal Peer-reviewed

Don Brownlee, Peter Tsou, Jérôme Aléon, Conel M O'd Alexander, Tohru Araki, Sasa Bajt, Giuseppe A Baratta, Ron Bastien, Phil Bland, Pierre Bleuet, Janet Borg, John P Bradley, Adrian Brearley, F Brenker, Sean Brennan, John C Bridges, Nigel D Browning, John R Brucato, E Bullock, Mark J Burchell, Henner Busemann, Anna Butterworth, Marc Chaussidon, Allan Cheuvront, Miaofang Chi, Mark J Cintala, B C Clark, Simon J Clemett, George Cody, Luigi Colangeli, George Cooper, Patrick Cordier, C Daghlian, Zurong Dai, Louis D'Hendecourt, Zahia Djouadi, Gerardo Dominguez, Tom Duxbury, Jason P Dworkin, Denton S Ebel, Thanasis E Economou, Sirine Fakra, Sam A J Fairey, Stewart Fallon, Gianluca Ferrini, T Ferroir, Holger Fleckenstein, Christine Floss, George Flynn, Ian A Franchi, Marc Fries, Z Gainsforth, J-P Gallien, Matt Genge, Mary K Gilles, Philipe Gillet, Jamie Gilmour, Daniel P Glavin, Matthieu Gounelle, Monica M Grady, Giles A Graham, P G Grant, Simon F Green, Faustine Grossemy, Lawrence Grossman, Jeffrey N Grossman, Yunbin Guan, Kenji Hagiya, Ralph Harvey, Philipp Heck, Gregory F Herzog, Peter Hoppe, Friedrich Hörz, Joachim Huth, Ian D Hutcheon, Konstantin Ignatyev, Hope Ishii, Motoo Ito, Damien Jacob, Chris Jacobsen, Stein Jacobsen, Steven Jones, David Joswiak, Amy Jurewicz, Anton T Kearsley, Lindsay P Keller, H Khodja, A L David Kilcoyne, Jochen Kissel, Alexander Krot, Falko Langenhorst, Antonio Lanzirotti, Loan Le, Laurie A Leshin, J Leitner, L Lemelle, Hugues Leroux, Ming-Chang Liu, K Luening, Ian Lyon, Glen Macpherson, Matthew A Marcus, Kuljeet Marhas, Bernard Marty, Graciela Matrajt, Kevin McKeegan, Anders Meibom, Vito Mennella, Keiko Messenger, Scott Messenger, Takashi Mikouchi, Smail Mostefaoui, Tomoki Nakamura, T Nakano, M Newville, Larry R Nittler, Ichiro Ohnishi, Kazumasa Ohsumi, Kyoko Okudaira, Dimitri A Papanastassiou, Russ Palma, Maria E Palumbo, Robert O Pepin, David Perkins, Murielle Perronnet, P Pianetta, William Rao, Frans J M Rietmeijer, François Robert, D Rost, Alessandra Rotundi, Robert Ryan, Scott A Sandford, Craig S Schwandt, Thomas H See, Dennis Schlutter, J Sheffield-Parker, Alexandre Simionovici, Steven Simon, I Sitnitsky, Christopher J Snead, Maegan K Spencer, Frank J Stadermann, Andrew Steele, Thomas Stephan, Rhonda Stroud, Jean Susini, S R Sutton, Y Suzuki, Mitra Taheri, Susan Taylor, Nick Teslich, Kazu Tomeoka, Naotaka Tomioka, Alice Toppani, Josep M Trigo-Rodríguez, David Troadec, Akira Tsuchiyama, Anthony J Tuzzolino, Tolek Tyliszczak, K Uesugi, Michael Velbel, Joe Vellenga, E Vicenzi, L Vincze, Jack Warren, Iris Weber, Mike Weisberg, Andrew J Westphal, Sue Wirick, Diane Wooden, Brigitte Wopenka, Penelope Wozniakiewicz, Ian Wright, Hikaru Yabuta, Hajime Yano, Edward D Young, Richard N Zare, Thomas Zega, Karen Ziegler, Laurent Zimmerman, Ernst Zinner, Michael Zolensky

Science (New York, N.Y.)　314　(5806)　1711-6　2006/12/15

DOI： 10.1126/science.1135840 　

ISSN： 0036-8075

eISSN： 1095-9203
Structural state of plagioclase from the Kobe CK chondrite: Implications for the thermal history of the CK parent body Peer-reviewed

Yoshihiro Nakamuta, Tomoki Nakamura, Noboru Nakamura

Journal of Mineralogical and Petrological Sciences　101　(6)　308-318　2006/12/12

DOI： 10.2465/jmps.060106 　

ISSN： 1345-6296 1349-3825
Close-up images of the surface of Asteroid Itokawa taken by Hayabusa space craft and comparison of them with photographs of large meteorites

NOGUCHI T, TSUCHIYAMA A, HIRATA N, NAKAMURA R, MIYAMOTO H, DEMURA H, YANO H, NAKAMURA T, SAITO J, SASAKI S, HASHIMOTO T, KUBOTA T, ISHIGURO M, ZOLENSKY M

21　(2)　192-193　2006/10/01

ISSN： 0915-6089
Mineralogy and petrology of Comet Wild-2 nucleus samples - Final results of the preliminary examination team Peer-reviewed

Michael Zolensky, Phil Bland, John Bradley, Adrian Brearley, Sean Brennan, John Bridges, Donald Brownlee, Arma Buttervorth, Zurong Dai, Denton Ebel, Matt Genge, Matthieu Gounelle, Giles Graham, Jeff Grossman, Lawrence Grossman, Ralph Harvey, Hope Ishii, Anton Kearsley, Lindsay Keller, Alexander Krot, Falko Langenhorst, Antonio Lanzirotti, Hugues Leroux, Graciela Matrajt, Keiko Messenger, Takashi Mikouchi, Tomoki Nakamura, Kazumasa Ohsumi, Kyoko Okudaira, Murielle Perronnet, Frans Rietmeijer, Steven Simon, Thomas Stephan, Rhonda Stroud, Mitra Taheri, Kazu Tomeoka, Alice Toppani, Peter Tsou, Akira Tsuchiyama, Michael Velbel, Iris Weber, Mike Weisberg, Andrew Westphal, Hajime Yano, Thomas Zega

METEORITICS & PLANETARY SCIENCE　41　(8)　A167-A167　2006/08

ISSN： 1086-9379
Yamato 793321 CM chondrite: Dehydrated regolith material of a hydrous asteroid Peer-reviewed

T Nakamura

EARTH AND PLANETARY SCIENCE LETTERS　242　(1-2)　26-38　2006/02

DOI： 10.1016/j.epsl.2005.11.040 　

ISSN： 0012-821X
Cosmic-ray exposure age and heliocentric distance of the parent bodies of enstatite chondrites ALH 85119 and MAC 88136 Peer-reviewed

D. Nakashima, T. Nakamura, R. Okazaki

Meteoritics and Planetary Science　41　(6)　851-862　2006
Publisher: University of Arkansas
DOI： 10.1111/j.1945-5100.2006.tb00490.x 　

ISSN： 1086-9379
Trapped noble gas components and exposure history of the enstatite chondrite ALH84206 Peer-reviewed

Daisuke Nakashima, Tomoki Nakamura

GEOCHEMICAL JOURNAL　40　(6)　543-555　2006

ISSN： 0016-7002

eISSN： 1880-5973
Bulk mineralogical changes of hydrated micrometeorites during heating in the upper atmosphere at temperatures below 1000 oC. Peer-reviewed

Nozaki, W, Nakamura, T, Noguchi, T

Meteoritics Planet. Sci.　41　1095-1114　2006

DOI： 10.1111/j.1945-5100.2006.tb00507.x 　
Evidence from the Rb-Sr system for 4.4 Ga alteration of chondrules in the Allende (CV3) parent body Peer-reviewed

G Shimoda, N Nakamura, M Kimura, T Kani, S Nohda, K Yamamoto

METEORITICS & PLANETARY SCIENCE　40　(7)　1059-1072　2005/07

DOI： 10.1111/j.1945-5100.2005.tb00173.x 　

ISSN： 1086-9379
Invisible gold from the Hishikari epithermal gold deposit, Japan: Implication for gold distribution and deposition Peer-reviewed

Nobutaka Shimada, Tomoki Nakamura, Yasuo Morinaga, Yoshihito Shikama

Resource Geology　55　(2)　91-100　2005/06/01
Publisher: Society of Resource Geology
DOI： 10.1111/j.1751-3928.2005.tb00231.x 　

ISSN： 1344-1698
Formation processes of compound chondrules in CV3 carbonaceous chondrites: Constraints from oxygen isotope ratios and major element concentrations Peer-reviewed

Takeshi Akaki, Tomoki Nakamura

Geochimica et Cosmochimica Acta　69　(11)　2907-2929　2005/06/01

DOI： 10.1016/j.gca.2004.12.025 　

ISSN： 0016-7037
Mineralogy of carbonaceous chondrite clasts in H chondrite regolith breccias and the comparison with those of the clasts in howardites and micrometeorites

Noguchi Takaaki, Nakamura Tomoki, Fukawa Yoshiyuki, Nakashima Daisuke, Inada Atsushi, Nagao Keisuke, Kusakabe Minoru, Zolensky Michael

Abstracts for Annual Meeting of the Mineralogical Society of Japan　2005　138-138　2005
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.14824/kobutsu.2005.0.138.0 　

More details Close

Regolith breccias that were formed on the surface of asteroids often contain carbonaceous chondrite-like clasts. In this report, mineralogical features of the carbonaceous chondrite clasts in H chondrite regolith breccias are compared with those in howardites and those of micrometeorites. Most of the clasts in H chondrite regolith breccias contain only saponite or saponite and serpentine as phyllosilicates. Clasts that contain only serpentine as phyllosilicates are relatively minor. This tendency is similar to that of phyllosilicate-rich micrometeorites. However, among the carbonaceous chondrite clasts in howardites, CM chondrite-like clasts are the most abundant and CI chondrite-like clasts are less abundant than CM-like ones.
Motion of iron sulfide inclusions inside a shock-melted chondrule Peer-reviewed

Masayuki Uesugi, Takeshi Akaki, Minoru Sekiya, Tomoki Nakamura

Meteoritics and Planetary Science　40　(7)　1103-1114　2005
Publisher: University of Arkansas
DOI： 10.1111/j.1945-5100.2005.tb00175.x 　

ISSN： 1086-9379
Infrared spectroscopic taxonomy for carbonaceous chondrites from speciation of hydrous components. Peer-reviewed

Osawa, T, Kagi, H, Nakamura, T, Noguchi, T

Meteoritics Planet. Sci.　40　71-86　2005
He-Ar and Nd-Sr isotopic compositions of ultramafic xenoliths and host alkali basalts from the Korean peninsula Peer-reviewed

Kim K.H, Nagao K, Tanaka T, Sumino H, Nakamura T, Okuno M, Lock J.B, Youn J.S, Song J

Geochemical Journal　39　(4)　341-356　2005
Publisher:
DOI： 10.2343/geochemj.39.341 　

ISSN： 0016-7002
Oxygen isotopic and chemical compositions of cosmic spherules collected from the Antarctic ice sheet: Implications for their precursor materials Peer-reviewed

Yada T, Nakamura T, Noguchi T, Matsumoto N, Kusakabe M, Hiyagon H, Ushikubo T, Sugiura N, Kojima H, Takaoka N

Geochimica et Cosmochimica Acta　69　(24)　5789-5804　2005

DOI： 10.1016/j.gca.2005.08.002 　
Density and porosity measurement of antarctic micrometeorites using microtomography

A Tsuchiyama, T Okazawa, T Noguchi, H Yano, T Osawa, T Nakamura, K Nakamura, T Nakano, K Uesugi, H Yasuda

METEORITICS & PLANETARY SCIENCE　39　(8)　A107-A107　2004/08

ISSN： 1086-9379
REE abundances in the matrix of the Allende (CV) meteorite: Implications for matrix origin Peer-reviewed

M Inoue, M Kimura, N Nakamura

METEORITICS & PLANETARY SCIENCE　39　(4)　599-608　2004/04

ISSN： 1086-9379
Evaluation of mineralogical alteration of micrometeoroid analog materials captured in aerogel

K Okudaira, T Noguchi, T Nakamura, S Sugita, Y Sekine, H Yano

SCIENTIFIC EXPLORATION, PLANETARY PROTECTION, ACTIVE EXPERIMENTS AND DUSTY PLASMAS　34　(11)　2299-2304　2004

DOI： 10.1016/j.asr.2004.06.003 　

ISSN： 0273-1177
Mineralogy and noble-gas signatures of the carbonate-rich lithology of the Tagish Lake carbonaceous chondrite: evidence for an accretionary breccia Peer-reviewed

T Nakamura, T Noguchi, ME Zolensky, M Tanaka

EARTH AND PLANETARY SCIENCE LETTERS　207　(1-4)　83-101　2003/02

DOI： 10.1016/S0012-821X(02)01127-5 　

ISSN： 0012-821X
Noble gas isotopes and mineral assemblages of Antarctic micrometeorites collected at the meteorite ice field around the Yamato Mountains. Peer-reviewed

Osawa T, Nakamura T, Nagao K

Meteoritics & Planetary Science　38　1627-1640　2003
Antarctic micrometeorites collected by the Japanese Antarctic Research Expedition teams during 1996-1999

T Noguchi, H Yano, K Terada, N Imae, T Yada, T Nakamura, H Kojima

DUST IN THE SOLAR SYSTEM AND OTHER PLANETARY SYSTEMS　15　392-395　2002

DOI： 10.1016/S0964-2749(02)80371-7 　

ISSN： 0964-2749
Accretion rates of micrometeorites in the last glacial period

YADA Toru, NAKAMURA Tomoki, TAKAOKA Nobuo, NOGUCHI Takaaki, TERADA Kentaro, KOJIMA Hideyasu

Planetary People　10　(4)　184-191　2001/12/25
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X
Bulk mineralogy of individual micrometeorites determined by X-ray diffraction analysis and transmission electron microscopy Peer-reviewed

T Nakamura, T Noguchi, T Yada, Y Nakamuta, N Takaoka

GEOCHIMICA ET COSMOCHIMICA ACTA　65　(23)　4385-4397　2001/12

DOI： 10.1016/S0016-7037(01)00722-0 　

ISSN： 0016-7037
Noble-gas-rich chondrules in an enstatite meteorite Peer-reviewed

Ryuji Okazaki, Nobuo Takaoka, Keisuke Nagao, Minoru Sekiya, Tomoki Nakamura

Nature　412　(6849)　795-798　2001/08/23

DOI： 10.1038/35090520 　

ISSN： 0028-0836
Collisional destruction experiment of chondrules and formation of fragments in the solar nebula Peer-reviewed

Toshihiro Ueda, Yuuki Murakami, Naoki Ishitsu, Hiroshi Kawabe, Ryuuichi Inoue, Tomoki Nakamura, Minoru Sekiya, Nobuo Takaoka

Earth, Planets and Space　53　(9)　927-935　2001
Publisher: Springer Berlin
DOI： 10.1186/BF03351689 　

ISSN： 1880-5981 1343-8832
The accretion rates of cosmic dust on the earth based on the concentrations of micrometeorites in bare ice around the Yamato Mountains.

T Yada, T Nakamura, T Noguchi, H Yano, K Terada, T Murakami, H Kojima

METEORITICS & PLANETARY SCIENCE　35　A173-A174　2000/09

ISSN： 0026-1114
The effect of fabrication processes on strength properties of GMM Peer-reviewed

T Nakamura, T Noguchi

EXPERIMENTAL MECHANICS, VOLS 1 AND 2　1039-1043　1998
Comparisons of unmelted Antarctic micrometeorites with CM chondrites in petrology and mineralogy.

T Yada, H Yano, T Nakamura, N Takaoka

METEORITICS & PLANETARY SCIENCE　32　(4)　A144-A144　1997/07

ISSN： 0026-1114

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Misc. 252

火の鳥「はやぶさ」未来編(その30)Ryugu「石」分析チームによる科学成果

中村智樹, 天野香菜, 松岡萌, 黒澤耕介, 二宮和彦, 大澤崇人, 木村勇気, 玄田英典, 田中智, はやぶさ2初期分析「石」チーム

遊・星・人 = Planetary people : 日本惑星科学会誌　32　(3)　226-235　2023/09
Publisher: 京都 : 日本惑星科学会
ISSN： 0918-273X
Overview of the search for signs of space weathering on the low-albedo asteroid (101955) Bennu

B. E. Clark, A. Sen, X. D. Zou, D. N. DellaGiustina, S. Sugita, N. Sakatani, M. Thompson, D. Trang, E. Tatsumi, M. A. Barucci, M. Barker, H. Campins, T. Morota, C. Lantz, A. R. Hendrix, F. Vilas, L. Keller, V. E. Hamilton, K. Kitazato, S. Sasaki, M. Matsuoka, T. Nakamura, A. Praet, S. M. Ferrone, T. Hiroi, H. H. Kaplan, W. F. Bottke, J. Y. Li, L. Le Corre, J. L. Molaro, R. L. Ballouz, C. W. Hergenrother, B. Rizk, K. N. Burke, C. A. Bennett, D. R. Golish, E. S. Howell, K. Becker, A. J. Ryan, J. P. Emery, S. Fornasier, A. A. Simon, D. C. Reuter, L. F. Lim, G. Poggiali, P. Michel, M. Delbo, O. S. Barnouin, E. R. Jawin, M. Pajola, L. Riu, T. Okada, J. D.P. Deshapriya, J. R. Brucato, R. P. Binzel, D. S. Lauretta

Icarus　400　2023/08

DOI： 10.1016/j.icarus.2023.115563 　

ISSN： 0019-1035

eISSN： 1090-2643
Formation of C-type asteroids inferred from mineral chemistry of samples returned by Hayabusa2 mission

中村智樹, 杉山和正, 正橋直哉

東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)　2022　2023
Mission Operation Study of Martian Moons eXploration (MOWT)

中村智樹, 池田人, 竹尾洋介, 神山徹, 中川広務, 松本晃治, 千秋博紀, 亀田真吾, 寺田直樹, 岩田隆浩, 横田勝一郎, 尾崎直哉, 平田成, 宮本英昭, 小川和律, 草野広樹, 小林正規, 大木優介, BARUCCI Antonietta, SAWYER Eric, LAWRENCE David J., CHABOT Nancy L., PEPLOWSKI Patrick N., ULAMEC Stephan, MICHEL Patrick, 今田高峰, 今井茂, 石田初美, 尾川順子, 倉本圭, 安光亮一郎, 大嶽久志, 川勝康弘

宇宙科学技術連合講演会講演集(CD-ROM)　67th　2023

ISSN： 1884-1945
Total System Detail Design of Mission Execution of Martian Moons eXploration (MMX) and Mission Robustness Design

吉川健人, 大野剛, 今田高峰, 安光亮一郎, 牧謙一郎, 小川和律, 池田人, 澤田弘崇, 中山大輔, 和田浩二, 中村智樹

宇宙科学技術連合講演会講演集(CD-ROM)　66th　2022

ISSN： 1884-1945
Mission Operation Study of Martian Moons eXploration (MOWT)

竹尾洋介, 中村智樹, 池田人, 神山徹, 中川広務, 松本晃治, 千秋博紀, 亀田真吾, 寺田直樹, 岩田隆浩, 横田勝一郎, 尾崎直哉, GONZALEZ-FRANQUESA Ferran, 平田成, 宮本英昭, 小川和律, 草野広樹, 小林正規, 大木優介, BARESI Nicola, BARUCCI Antonietta, SAWYER Eric, LAWRENCE David J., CHABOT Nancy L., PEPLOWSKI Patrick N., ULAMEC Stephan, MICHEL Patrick, 今田高峰, 今井茂, 石田初美, 尾川順子, 倉本圭, 安光亮一郎, 大嶽久志, 川勝康弘

宇宙科学技術連合講演会講演集(CD-ROM)　66th　2022

ISSN： 1884-1945
Status of study on the spacecraft candidate landing regions for the Martian Moons eXploration (MMX)

和田浩二, 中村智樹, 宮本英昭, 松本晃治, 平田成, 菊地紘, 逸見良道, 清水俊輔, 菊地翔太, 倉本圭, 諸田智克, 小川和律, 巳谷真司, 岡田尚基, 尾川順子, 池田人, 竹尾洋介, 松本祐樹, 大野剛, 吉川健人, 安光亮一郎

宇宙科学技術連合講演会講演集(CD-ROM)　66th　2022

ISSN： 1884-1945
Organic matter in Ryugu vs. carbonaceous chondrites: IR spectroscopic perspectives

癸生川陽子, DARTOIS E., QUIRICO E., BONAL L., ENGRAND C., DUPRAT J., MATHURIN J., DAZZI A., DENISET-BESSEAU A., 薮田ひかる, 圦本尚義, 中村智樹, 野口高明, 岡崎隆司, 奈良岡浩, 坂本佳奈子, 橘省吾, 橘省吾, 渡邊誠一郎, 津田雄一

日本地球化学会年会要旨集(Web)　69th　2022
In-situ oxygen and manganese-chromium isotope studies of Ryugu: Implications to temperature and timing of aqueous activity.

永島一秀, 川崎教行, 坂本直哉, 中村智樹, 野口高明, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 渡邊誠一郎, 津田雄一, 橘省吾, 圦本尚義

日本地球化学会年会要旨集(Web)　69th　2022
Development of elastic wave velocity measurement technology for Hayabusa2 return sample.

猪裕太, 猪裕太, 田中智, 田中智, 小野寺圭祐, 小野寺圭祐, 川村太一, 嶌生有理, 中嶋大輔, 岩田隆浩, 岩田隆浩, 中村智樹, 森田朋代, 菊入瑞葉, 天野香菜, 加川瑛一, 圦本尚義, 野口高明, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 橘省吾, 橘省吾, 渡邊誠一郎, 津田雄一

日本地球惑星科学連合大会予稿集(Web)　2022　2022
Petrology and mineralogy of olivine in asteroidal Ryugu samples

三河内岳, 吉田英人, 中村智樹, ZOLENSKY Michael E., 中嶋大輔, 萩谷健治, 菊入瑞葉, 森田朋代, 天野香菜, 加川瑛一, 圦本尚義, 野口高明, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 橘省吾, 渡邊誠一郎, 津田雄一

日本鉱物科学会年会講演要旨(Web)　2022　2022
Mineralogical investigation of multiple lithologies in the Hayabusa2 returned sample C0002 grain using SEM, TEM, and X-ray nanoCT

松本恵, 松野淳也, 土山明, 土山明, 中村智樹, 三河内岳, 安武正展, 上杉健太朗, 竹内晃久, 延寿里美, 奥村翔太, 三津川到, MINGQI S., 榎戸祐馬, 三宅亮, 圦本尚義, 野口高明, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 橘省吾, 渡邊誠一郎, 津田雄一

日本鉱物科学会年会講演要旨(Web)　2022　2022
A nugget of platinum group element sulfides found from a Ryugu sample

松野淳也, 三宅亮, 松本恵, 中村智樹, 高橋嘉夫, 山田真也, 土山明, 延寿里美, 圦本尚義, 野口高明, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 橘省吾, 渡邊誠一郎, 津田雄一

日本鉱物科学会年会講演要旨(Web)　2022　2022
Magnetite 3D morphology in Hayabusa2 returned sample: diversity and implication

土山明, 土山明, 松本恵, 松野淳也, 三宅亮, 中村智樹, 野口高明, 安武正展, 上杉健太朗, 竹内晃久, 延寿里美, 瀧川晶, 奥村翔太, 三津川到, MINGQI S., 榎戸祐馬, 松本徹, 圦本尚義, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 橘省吾, 渡邊誠一郎, 津田雄一

日本鉱物科学会年会講演要旨(Web)　2022　2022
リュウグウの微粒子と酸不溶性有機物の特徴:ラマン分光法による考察

小松睦美, 小松睦美, 薮田ひかる, 癸生川陽子, BONAL Lydie, QUIRICO Eric, 圦本尚義, 中村智樹, 野口高明, 岡崎隆司, 奈良岡浩, 坂本佳奈子, 橘省吾, 橘省吾, 渡邊誠一郎, 津田雄一

日本惑星科学会秋季講演会予稿集(Web)　2022　2022
リュウグウ試料の岩石磁気学的・古地磁気学的研究

佐藤雅彦, 木村勇気, 田中智, 畠山唯達, 杉田精司, 中村智樹, 橘省吾, 奥住聡, 渡邊誠一郎, 圦本尚義, 野口高明, 岡崎隆司, 薮田ひかる, 奈良岡浩, 坂本佳奈子, 矢田達, 西村征洋, 中藤亜衣子, 宮崎明子, 与賀田佳澄, 安部正真, 岡田達明, 臼井寛裕, 吉川真, 佐伯孝尚, 照井冬人, 中澤暁, 津田雄一

日本惑星科学会秋季講演会予稿集(Web)　2022　2022
放射光CTで得られるリュウグウ試料の3次元構造

上椙真之, 伊藤元雄, 松本恵, 土山明, 中村智樹, 平原佳織, 富岡尚敬, 上杉健太郎, 山口亮, 今栄直也, 白井直樹, 大東琢治, 木村眞, LIU Ming-Chang, GREENWOOD Richard, 中藤亜衣子, 与賀田佳澄, 竹内晃久, 安武正展, 湯沢勇人, 兒玉優, 櫻井郁也, 岡田育夫, 唐牛譲, 渡邉誠一郎, 津田雄一

日本惑星科学会秋季講演会予稿集(Web)　2022　2022
Diversity of thermal properties on the surface of Ryugu observed by TIR on borad Hayabusa2

田中智, 伊藤瑞生, 坂谷尚哉, 嶌生有理, 岡田達明, 荒井武彦, 千秋博紀, 関口朋彦, 出村裕英, 長野方星, 中村智樹

Thermophysical Properties (CD-ROM)　42nd　2021

ISSN： 0911-1743
Study of Landing Sites Selection for the Martian Moons eXploration (MMX)

和田浩二, 中村智樹, 宮本英昭, 松本晃治, 平田成, 菊地紘, 逸見良道, 菊地翔太, 倉本圭, 小川和律, 巳谷真司, 岡田尚基, 尾川順子, 池田人, 竹尾洋介

宇宙科学技術連合講演会講演集(CD-ROM)　65th　2021

ISSN： 1884-1945
Mission Operation Study of Martian Moons eXploration (MOWT)

中村智樹, 池田人, 竹尾洋介, 神山徹, 中川広務, 松本晃治, 千秋博紀, 亀田真吾, 寺田直樹, 岩田隆浩, 横田勝一郎, 尾崎直哉, GONZALEZ-FRANQUESA Ferran, 平田成, 宮本英昭, 小川和律, 草野広樹, 小林正規, 大木優介, BARESI Nicola, BARUCCI Antonietta, SAWYER Eric, LAWRENCE David J., CHABOT Nancy L., PEPLOWSKI Patrick N., ULAMEC Stephan, MICHEL Patrick, 今田高峰, 今井茂, 石田初美, 尾川順子, 倉本圭, 安光亮一郎, 大嶽久志, 川勝康弘

宇宙科学技術連合講演会講演集(CD-ROM)　65th　2021

ISSN： 1884-1945
Elucidation of early solar system evolution based on mineral chemistry of primitive solar system material

中村智樹, 高橋実樹, 橋本幸菜, 松本恵, 杉山和正

東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)　2019　2020
Development and ground calibration strategy of DESTINY⁺ Dust Analyzer

平井隆之, 小林正規, 荒井朋子, 木村宏, SRAMA Ralf, KRUEGER Harald, 薮田ひかる, 伊藤元雄, TRIELOFF Mario, 佐々木晶, 中村智樹, 矢野創

日本地球惑星科学連合大会予稿集(Web)　2020　2020
THERMAL INERTIA OF FINE-GRAINED POWDER OF THE MURCHISON CM CHONDRITE DETERMINED BY EXPERIMENTAL HEATING.

Hikari Mita, Kana Amano, Shiho Kobayashi, Yuma Enokido, Naoya Sakatani, Takehiko Arai, Tomoki Nakamura

METEORITICS & PLANETARY SCIENCE　54　2019/08

ISSN： 1086-9379

eISSN： 1945-5100
はやぶさ2搭載近赤外分光計によって観測された小惑星リュウグウの表面組成

北里宏平, 岩田隆浩, 安部正真, 大竹真紀子, 松浦周二, 荒井武彦, 仲内悠祐, 中村智樹, 松岡萌, 千秋博紀, 平田成, 廣井孝弘, 渡邊誠一郎

日本惑星科学会秋季講演会予稿集(Web)　2019　2019
Elucidation of early solar system evolution based on mineral chemistry of primitive solar system material

中村智樹, 吉崎昂, 高橋実樹, 杉山和正

東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)　2018　2019
162173リュウグウ表面の岩石の明るさと形状の変化

佐々木晶, 杉田精司, 巽瑛理, 宮本英昭, 本田親寿, 諸田智克, 平林正稔, 神田志穂, 平田成, 廣井孝弘, 中村智樹, 野口高明, 本田理恵, 道上達広, 渡邊誠一郎, 並木則行, MICHEL Patrick, 亀田真吾, 神山徹, 鈴木秀彦, 山田学, 菊地紘, 長勇一郎, 吉岡和夫, 早川雅彦, 松岡萌, 野口里奈, 坂谷尚哉, 澤田弘崇, 横田康弘, 横田康弘, 吉川真

日本地球惑星科学連合大会予稿集(Web)　2019　2019
Redistribution of Sr and rare earth elements in the matrices of CV3 carbonaceous chondrites during aqueous alteration in their parent body

Kaori Jogo, Motoo Ito, Tomoki Nakamura, Sachio Kobayashi, Jong Ik Lee

Earth, Planets and Space　70　(1)　2018/12/01

DOI： 10.1186/s40623-018-0809-5 　

ISSN： 1343-8832

eISSN： 1880-5981
SPECTRAL AND WATER ANALYSIS OF EXPERIMENTALLY HEATED TAGISH LAKE AND CR CARBONACEOUS CHONDRITES WITH NO EFFECTS OF ADSORBED AND REHYDRATED WATER.

Kana Amano, Kaoru Mogi, Tomoki Nakamura, Moe Matsuoka, Yoshihiro Furukawa, Satoshi Okumura

METEORITICS & PLANETARY SCIENCE　53　6309-6309　2018/08

ISSN： 1086-9379

eISSN： 1945-5100
Elucidation of early solar system evolution based on mineral chemistry of primitive solar system material

中村智樹, 吉崎昂, 高橋実樹, 榎戸祐馬, 菊池知紀, 杉山和正

東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)　2017　105‐106　2018/06/25
An evaluation method of reflectance spectra to be obtained by Hayabusa2 Near-Infrared Spectrometer (NIRS3) based on laboratory measurements of carbonaceous

Moe Matsuoka, Tomoki Nakamura, Takahito Osawa, Takahiro Iwata, Kohei Kitazato, Masanao Abe, Yusuke Nakauchi, Takehiko Arai, Mutsumi Komatsu, Takahiro Hiroi, Naoya Imae, Akira Yamaguchi, Hideyasu Kojima

Earth, Planets and Space　69　2017/12/01

DOI： 10.1186/s40623-017-0705-4 　

ISSN： 1343-8832
SOLAR-RADIATION HEATING AS A POSSIBLE HEAT SOURCE FOR DEHYDRATION OF HYDROUS CARBONACEOUS CHONDRITES. Peer-reviewed

Tomoki Nakamura, Gregor Golabek, Katsuhito Ohtsuka, Moe Matsuoka

METEORITICS & PLANETARY SCIENCE　52　A252-A252　2017/08

ISSN： 1086-9379

eISSN： 1945-5100
DISCOVERY OF RUBINITE, Ca3Ti23+Si3O12, A NEW GARNET MINERAL IN REFRACTORY INCLUSIONS FROM CARBONACEOUS CHONDRITES.

Chi Ma, Takashi Yoshizaki, Alexander N. Krot, John R. Beckett, Tomoki Nakamura, Kazuhide Nagashima, Jun Muto, Marina A. Ivanova

METEORITICS & PLANETARY SCIENCE　52　A211-A211　2017/08

ISSN： 1086-9379

eISSN： 1945-5100
DEHYDRATION PROCESS OF EXPERIMENTALLY HEATED MURCHISON WITHOUT ANY EFFECTS OF ADSORBED AND REHYDRATED WATER

Kaoru Mogi, Sayuri Yamashita, Tomoki Nakamura, Moe Matsuoka, Satoshi Okumura, Yoshihiro Furukawa

METEORITICS & PLANETARY SCIENCE　52　A240-A240　2017/08

ISSN： 1086-9379

eISSN： 1945-5100
火星衛星探査計画MMXとそのサイエンス2017

倉本圭, 川勝康弘, 藤本正樹, 玄田英典, 今村剛, 亀田真吾, 松本晃治, 宮本英昭, 諸田智克, 中村智樹, 小川和律, 尾崎正伸, 佐々木晶, 千秋博紀, 橘省吾, 寺田直樹, 臼井寛裕, 和田浩二, 渡邊誠一郎

日本惑星科学会秋季講演会予稿集(Web)　2017　2017
Elucidation of early solar system evolution based on mineral chemistry of primitive solar system material

中村智樹, 吉崎昂, 高橋実樹, 榎戸祐馬, 百合本はる妃, 中嶋大輔, 杉山和正

東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)　2016　2017
DESTINY⁺による流星群母天体フライバイ計画

荒井朋子, 小林正規, 千秋博紀, 石橋高, 山田学, 和田浩二, 石丸亮, 大塚勝仁, 伊藤孝士, 渡部潤一, 亀田真吾, 川勝康弘, Bruno Sarli, 岩田隆浩, 岡田達明, 吉川真, 船瀬龍, 五十里哲, 尾崎直哉, 石黒正晃, 浦川聖太郎, 阿部新助, 小松睦美, 中村智樹, 中藤亜衣子, 中村メッセンジャー圭子, 三河内岳, 佐々木晶, 薮田ひかる, 廣井孝弘, 橘省吾, 木村宏, 矢野創, 並木則行, Srama Ralph, Kruger Harald

宇宙科学技術連合講演会講演集　60　6p　2016/09/06
Publisher: 日本航空宇宙学会
ISSN： 1884-1945
Science of Mars Moons Exploration mission

60　5p　2016/09/06
Publisher: 日本航空宇宙学会
ISSN： 1884-1945
Scientific Strategy of Landing Site Selection for Hayabusa2

H. Yabuta, A. Nakato, M. Komatsu, T. Morota, M. Matsuoka, S. Sugita, T. Hiroi, K. Kitazato, T. Okada, H. Senshu, S. Sasaki, T. Nakamura, N. Kobayashi, S. Watanabe

METEORITICS & PLANETARY SCIENCE　51　A676-A676　2016/08

ISSN： 1086-9379

eISSN： 1945-5100
EARLY STAGES OF AQUEOUS ALTERATION IN COMETARY BODIES.

T. Noguchi, H. Yabuta, S. Itoh, N. Sakamoto, T. Mitsunari, A. Okubo, R. Okazaki, T. Nakamura, S. Tachibana, K. Terada, M. Ebihara, N. Imae, M. Kimura, H. Nagahara

METEORITICS & PLANETARY SCIENCE　51　A489-A489　2016/08

ISSN： 1086-9379

eISSN： 1945-5100
MMXリモートセンシングによるフォボス分光観測と物質分布推定

中村智樹, 亀田真吾, 宮本英昭, 長谷部信行, 岡田達明, ロッシュテッド

日本惑星科学会秋季講演会予稿集(Web)　2016　2016
はやぶさ2着陸地点の検討状況

中藤亜衣子, 薮田ひかる, 小松睦美, 諸田智克, 松岡萌, 杉田精司, 廣井孝弘, 北里宏平, 岡田達明, 千秋博紀, 佐々木晶, 中村智樹, 小林直樹, 渡邉誠一郎

日本地球惑星科学連合大会予稿集(Web)　2016　ROMBUNNO.PCG10‐04 (WEB ONLY)　2016
浮遊法を用いた再現実験によるコンドリュール形成環境の検討

野村逸郎, 中村智樹, 木村勇気, 塚本勝男, 塚本勝男, 三浦均, 上椙真之, 上杉健太朗, 星野真人

日本鉱物科学会年会講演要旨集　2015　146　2015/09/18

ISSN： 1348-6543
REFLECTANCE SPECTRA MEASUREMENT OF VARIOUS CARBONACEOUS CHONDRITES USING HAYABUSA-2 NEAR INFRARED SPECTROMETER

T. Nakamura, T. Iwata, K. Kitasato, M. Abe, T. Osawa, M. Matsuoka, Y. Nakauchi, T. Arai, M. Komatsu, T. Hiroi, N. Imae, A. Yamaguchi, H. Kojima

METEORITICS & PLANETARY SCIENCE　50　2015/08

ISSN： 1086-9379

eISSN： 1945-5100
VARIATIONS IN ORGANIC FUNCTIONAL GROUPS BETWEEN HYDROUS AND ANHYDROUS ANTARCTIC MICROMETEORITES

H. Yabuta, T. Noguchi, S. Itoh, T. Nakamura, T. Mitsunari, A. Okubo, R. Okazaki, S. Tachibana, K. Terada, M. Ebihara, H. Nagahara

METEORITICS & PLANETARY SCIENCE　50　2015/08

ISSN： 1086-9379

eISSN： 1945-5100
はやぶさ2搭載近赤外分光計NIRS3の開発結果

岩田隆浩, 北里宏平, 安部正真, 荒井武彦, 仲内悠祐, 中村智樹, 廣井孝弘, 大澤崇人, 松岡萌, 松浦周二

日本地球惑星科学連合大会予稿集(Web)　2015　2015
「はやぶさ」帰還試料コンソーシアム研究の進捗:硫化鉄粒子及びリン酸塩鉱物を含む粒子

唐牛譲, 上椙真之, 矢田達, 中藤亜衣子, 橋口未奈子, 松本徹, 熊谷和也, 海老原充, 白井直樹, 関本俊, 山口亮, 寺田健太郎, 土山明, 中村智樹, 野口高明, 岡田達明, 安部正真

日本惑星科学会秋季講演会予稿集(Web)　2015　2015
はやぶさ2近赤外分光計で探る地球の水の起源

北里宏平, 岩田隆浩, 安部正真, 大竹真紀子, 廣井孝弘, 中村智樹, 小松睦美, 荒井朋子, 中藤亜衣子, 大澤崇人, 仲内悠祐, 渡邊誠一郎

日本地球惑星科学連合大会予稿集(Web)　2015　ROMBUNNO.MIS35‐03 (WEB ONLY)　2015
Report of 2014 Fall Meeting

Nakamura T.

Planetary People　23　(4)　398-399　2014/12/25
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X
P2-22 Sub-kmサイズ地球近傍小惑星2011XA_3の高速自転II(ポスターセッション2,ポスター発表)

浦川聖太郎, 大塚勝仁, 阿部新助, 伊藤孝士, 中村智樹

日本惑星科学会秋期講演会予稿集　2014　"P2-22"　2014/09/10
Publisher: 日本惑星科学会
P1-35 Implications for the formation process of thermally metamorphosed carbonaceous chondrites based on mineralogical and oxygen isotopic changes in experimentally heated products

Ahn Insu, Chan Queenie H.-S, Zolensky Michael, Lee Jong-Ik

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2014　"P1-35"　2014/09/10
Publisher: The Japanese Society for Planetary Sciences
P1-36 CM炭素質コンドライトの岩石学的特徴に基づいたC型小惑星の水質変成による物質進化過程(ポスターセッション1,ポスター発表)

仲田愛里, 中村智樹, 木村勇気, 武藤潤

日本惑星科学会秋期講演会予稿集　2014　"P1-36"　2014/09/10
Publisher: 日本惑星科学会
O10-05 CVコンドライト隕石の水質変成と熱変成(口頭発表セッション10 隕石・実験,口頭発表)

小松睦美, 荒井朋子, 山本彩, 三河内岳, 中村智樹, 廣井孝弘, 北里宏平

日本惑星科学会秋期講演会予稿集　2014　"O10-05"　2014/09/10
Publisher: 日本惑星科学会
P1-27 Performances of Flight Model of NIRS3 : the Near Infrared Spectrometer on Hyabusa-2

Iwata Takahiro

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2014　"P1-27"　2014/09/10
Publisher: The Japanese Society for Planetary Sciences
O8-05 炭素質隕石へのパルスレーザー照射によるC型小惑星における宇宙風化作用再現実験(口頭発表セッション8 物質II,口頭発表)

松岡萌, 中村智樹, 木村勇気, 廣井孝弘, 中村良介, 奥村聡, 佐々木晶

日本惑星科学会秋期講演会予稿集　2014　"O8-05"　2014/09/10
Publisher: 日本惑星科学会
O7-03 はやぶさ2近赤外分光計による含水および脱水炭素質隕石の反射スペクトル測定(口頭発表セッショ7 はやぶさ2,口頭発表)

中村智樹, 岩田隆浩, 北里宏平, 安部正真, 大澤崇人, 松岡萌, 仲内悠祐, 荒井武彦, 小松睦美, 廣井孝弘, 今栄直也, 山口亮, 小島秀康

日本惑星科学会秋期講演会予稿集　2014　"O7-03"　2014/09/10
Publisher: 日本惑星科学会
O10-06 CV3炭素質コンドライト隕石母天体の集積時期と形成進化過程(口頭発表セッション10 隕石・実験,口頭発表)

城後香里, 中村智樹, 伊藤元雄, 脇田茂, Zolotov Mikhail, Messenger Scott

日本惑星科学会秋期講演会予稿集　2014　"O10-06"　2014/09/10
Publisher: 日本惑星科学会
SURFACE MICROMORPHOLOGIES OF REGOLITH PARTICLES FROM ASTEROID ITOKAWA AND ITS IMPLICAITION TO SPACE WEATHERING.

T. Matsumoto, A. Tsuchiyama, A. Miyake, T. Noguchi, T. Nakamura, M. Nakamura, J. Matsuno, A. Shimada, K. Uesugi, T. Nakano

METEORITICS & PLANETARY SCIENCE　49　A266-A266　2014/09

ISSN： 1086-9379

eISSN： 1945-5100
Petrographic, chemical and spectroscopic evidence for thermal metamorphism in carbonaceous chondrites I: CI and CM chondrites (vol 126, pg 284, 2014)

Eric Tonui, Mike Zolensky, Takahiro Hiroi, Tomoki Nakamura, Michael E. Lipschutz, Ming-Sheng Wang, Kyoko Okudaira

GEOCHIMICA ET COSMOCHIMICA ACTA　132　458-458　2014/05

DOI： 10.1016/j.gca.2014.02.022 　

ISSN： 0016-7037

eISSN： 1872-9533
DESTINY応用:小惑星Phaethonフライバイミッション

荒井朋子, 小林正規, 春日敏測, 大塚勝仁, 川勝康弘, BRUNO Sarli, 渡部潤一, 伊藤孝士, 中村智樹, 中村良介, 中村メッセンジャー圭子, 小松睦美, 中藤亜衣子, 三河内岳, 亀田真吾, 中宮賢樹, 阿部新助, 浦川聖太郎, 千秋博紀, 和田浩二, 大野宗佑, 石橋高, 石丸亮, 木村宏, SRAMA Ralph, KRUEGER Harald

宇宙科学技術連合講演会講演集(CD-ROM)　58th　2014

ISSN： 1884-1945
小惑星イトカワのレゴリス粒子の表面微細構造から考察するレゴリスの宇宙風化過程

松本徹, 土山明, 三宅亮, 野口高明, 中村智樹, 中村美千彦, 松野淳也, 島田玲, 上杉健太朗, 中野司

日本地球惑星科学連合2014年大会　2014
O9-07 CVコンドライト及びCRコンドライトの水質変成について(口頭発表セッション9(はやぶさ),口頭発表)

小松睦美, 三河内岳, 荒井朋子, 山本彩, 中村智樹, 廣井孝弘, 北里宏平

日本惑星科学会秋期講演会予稿集　2013　"O9-07"　2013/11/20
Publisher: 日本惑星科学会
P3-05 はやぶさ2近赤外分光計NIRS3の運用計画(ポスターセッション3,ポスター発表)

北里宏平, 岩田隆浩, 安部正真, 大竹真紀子, 平田成, 千秋博紀, 中村智樹, 小松睦美, 荒井朋子, 廣井孝弘, 松浦周二, 津村耕司, 荒井武彦, 仲内悠祐, 高木靖彦, 本田親寿, 松永恒雄, 高遠徳尚, 渡邊誠一郎

日本惑星科学会秋期講演会予稿集　2013　"P3-05"　2013/11/20
Publisher: 日本惑星科学会
Precise spectral characterization of C-complex asteroids based on reflectance spectra of carbonaceous chondrites

NAKAMURA T., MISU T., MATSUOKA M., WAKITA S., HIROI T., SASAKI S.

2013　256-256　2013/09/05

ISSN： 1348-6543
A FINE-GRAINED POLYCRYSTALLINE MICRO-METEORITE: AN ASTEROIDAL DUST PARTICLE WITH A UNIQUE MINERALOGY.

T. Noguchi, S. Tsujimoto, R. Okazaki, T. Nakamura, M. Ebihara, S. Ito, H. Nagahara, S. Tachibana, K. Terada, H. Yabuta

METEORITICS & PLANETARY SCIENCE　48　A266-A266　2013/07

ISSN： 1086-9379

eISSN： 1945-5100
「はやぶさ帰還試料の分析で分かったこと」探査機「はやぶさ」が持ち帰った小惑星イトカワ粒子の初期記載について

矢田達, 安部正真, 岡田達明, 中村智樹, 野口高明, 岡崎隆司, 石橋之宏, 白井慶, 上椙真之, 唐牛讓, 八亀彰吾, 上野宗孝, 向井利典, 吉川真, 川口淳一郎, 藤村彰夫

日本惑星科学会誌遊・星・人　22　(2)　68-77　2013/06/25
Publisher: The Japanese Society for Planetary Sciences
DOI： 10.14909/yuseijin.22.2_68 　

ISSN： 0918-273X
Hayabusa-returned sample curation in the Planetary Material Sample Curation Facility of JAXA.

FUJIMURA Akio, ABE Masanao, YADA Toru, NAKAMURA Tomoki, NOGUCHI Takaaki, OKAZAKI Ryuji, NAGAO Keisuke, NARAOKA Hiroshi, ISHIBASHI Yukihiro, SHIRAI Kei, ZOLENSKY Michael, SANDFORD Scott, OKADA Tatsuaki, UESUGI Masayuki, KAROUJI Yuzuru, OGAWA Maho, YAKAME Shogo, UENO Munetaka, MUKAI Toshifumi, YOSHIKAWA Makoto, KAWAGUCHI Junichiro

宇宙航空研究開発機構特別資料 JAXA-SP-　(12-012E)　1-50　2013/03/29

ISSN： 1349-113X
DESTINY派性機による小惑星Phaethon探査

荒井朋子, 春日敏測, 大塚勝仁, 中村智樹, 中藤亜衣子, 中村良介, 渡部潤一, 伊藤孝士, 小林正規, 川勝康弘, BRUNO Sarli, MESSENJA-NAKAMURA Keiko, 小松睦美, 三河内岳, 亀田真吾, 中宮賢樹, 千秋博紀, 和田浩二, 大野宗佑, 石橋高, 石丸亮, SRAMA Ralph, KRUEGER Harald

宇宙科学技術連合講演会講演集(CD-ROM)　57th　2013

ISSN： 1884-1945
はやぶさ2搭載近赤外分光計NIRS3の地上試験結果から期待される科学

岩田隆浩, 北里宏平, 安部正真, 大竹真紀子, 松浦周二, 荒井武彦, 仲内悠祐, 廣井孝弘, 中村智樹, 渡邊誠一郎

宇宙科学技術連合講演会講演集(CD-ROM)　57th　2013

ISSN： 1884-1945
Synchrotron X-ray diffraction analysis and electron microscopy of Itokawa dust particles recovered by the spacecraft Hayabusa

NAKAMURA Tomoki, TANAKA Masahiko

25　(6)　336-341　2012/11/30
Publisher: 日本放射光学会
ISSN： 0914-9287
O3-03 Science observations with Optical Navigation Camera (ONG) onboard Hayabusa2

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2012　29-29　2012/10/24
Publisher: The Japanese Society for Planetary Sciences
O3-04 小惑星イトカワ粒子のサイズ分布・鉱物比率について(口頭発表セッション3(惑星探査-小天体-),口頭発表)

矢田達, 安部正真, 岡田達明, 上椙真之, 唐牛譲, 石橋之宏, 八亀彰吾, 白井慶, 中村智樹, 野口高明, 岡崎隆司, 藤村彰夫

日本惑星科学会秋期講演会予稿集　2012　2012/10/24
Publisher: 日本惑星科学会
A chondrule-like object collected at the international space station

NOGUCHI T, NAKAMURA T, USHIKUBO T, KITA N, VALLEY W, YAMANAKA R, KIMOTO Y, KITAZAWA Y

日本鉱物科学会年会講演要旨集　2012　173-173　2012/09/15

ISSN： 1348-6543
A GRANULAR-OLIVINE CLAST WITH FRACTIONATED REE FROM THE MURCHISON CM CHONDRITE: EVIDENCE FOR ALTERATION/METAMORPHISM AND MELTING ON THE CM PARENT ASTETROID

M. Inoue, S. Itoh, H. Yurimoto, M. Kimura, N. Nakamura

METEORITICS & PLANETARY SCIENCE　47　A207-A207　2012/07

ISSN： 1086-9379
A MINERAL RATIO OF ITOKAWA PARTICLES RECOVERED FROM THE HAYABUSA SAMPLE CATCHER.

T. Yada, M. Abe, T. Okada, M. Uesugi, Y. Karouji, Y. Ishibashi, S. Yakame, K. Shirai, T. Nakamura, T. Noguchi, R. Okazaki, A. Fujimura

METEORITICS & PLANETARY SCIENCE　47　A421-A421　2012/07

ISSN： 1086-9379
COEXISTING NITROGEN- RICH AND POOR ORGANIC MATERIALS IN ULTRACARBONACEOUS ANTARCTIC MICROMETEORITE.

H. Yabuta, S. Itoh, T. Noguchi, N. Sakamoto, M. Hashiguchi, K. Abe, S. Tsujimoto, D. Kilcoyne, A. Okubo, R. Okazaki, S. Tachibana, K. Terada, T. Nakamura, H. Nagahara

METEORITICS & PLANETARY SCIENCE　47　A420-A420　2012/07

ISSN： 1086-9379
S‐520観測ロケットを用いた宇宙ダストの核生成実験にむけて:WG初年度活動報告

木村勇気, 稲富裕光, 三浦均, 田中今日子, 左近樹, 野沢貴也, 中村智樹, 塚本勝男

宇宙利用シンポジウム　28th　23-25　2012/03
「月惑星探査の来たる10年:第二段階のまとめ」小惑星Phaethon探査提案

荒井朋子, 春日敏測, 大塚勝仁, 中村智樹, 中藤亜衣子, 中村良介, 伊藤孝士, 渡部潤一, 小林正規, 川勝康弘, 中村圭子, 小松睦美, 千秋博紀, 和田浩二, 亀田真吾, 大野宗佑, 石橋高, 石丸亮, 中宮賢樹

日本惑星科学会誌遊・星・人　21　(3)　2012

ISSN： 0918-273X
A CM carbonaceous chondrite with flattened chondrules

Tomoki Nakamura, Aiko Nakato, Masaaki Miyahara, Katsuki Yoshioka, Masayuki Uesugi, Kentaro Uesugi, Engrand Cecile

Abstracts of Annual Meeting of the Geochemical Society of Japan　59　(0)　2012
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.59.0.268.0 　

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40以上のＣＭ隕石試料を研究し、その中で強く扁平したコンドリュールを含み比較的強い衝撃を受けたMET01072隕石を発見した。試料の放射光Ｘ線ＣＴ分析を行うことで衝撃圧縮方向を特定し、圧縮方向に平衡に試料を切断し最大圧縮面の詳細な観察・分析を行った。その結果、試料は強く圧縮され、コンドリュールやＰＣＰは大きく扁平していた。しかし、tochilinite-serpentine混合相が主要相として存在していることから、衝撃加熱温度は400℃以下であったことがわかった。薄片観察より衝撃圧は５GPa以上であると推定した。
S12-05 イトカワ上の礫と微粒子の組織が語るイトカワの過去(口頭セッション12:はやぶさ,口頭発表)

野口高明, 中村智樹, 木村眞, Zolensky Mike, 田中雅彦, 土山明, 岡崎隆司, はやぶさキュレーションチーム

日本惑星科学会秋期講演会予稿集　2011　17-17　2011/10/23
Publisher: 日本惑星科学会
S12-08 イトカワにおける宇宙風化(口頭セッション12:はやぶさ,口頭発表)

野口高明, 中村智樹, 木村眞, Zolensky Mike, 田中雅彦, 橋本隆仁, 今野充, 中藤亜衣子, 大神稔皓, 岡崎隆司, はやぶさキュレーションチーム

日本惑星科学会秋期講演会予稿集　2011　20-20　2011/10/23
Publisher: 日本惑星科学会
S12-02 Primitive materials of the parent body of asteroid Itokaw

Zolensky Mike, Sandford Scott

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2011　14-14　2011/10/23
Publisher: The Japanese Society for Planetary Sciences
S12-01 はやぶさ帰還試料キュレーションの現状(口頭セッション12:はやぶさ,口頭発表)

矢田達, 藤村彰夫, 安部正真, 岡田達明, 石橋之宏, 白井慶, 上椙真之, 唐牛譲, 八亀彰吾, 中村智樹, 野口高明, 岡崎隆司, 向井利典, 上野宗孝, 吉川真, 川口淳一郎

日本惑星科学会秋期講演会予稿集　2011　13-13　2011/10/23
Publisher: 日本惑星科学会
S12-03 イトカワ母天体の熱進化(口頭セッション12:はやぶさ,口頭発表)

圦本尚義, 中村智樹, 伊藤正一, 坂本直哉, 阿部憲一, 橋口未奈子, 片山樹里, 加藤千図, 川崎教行, 小林幸雄, 女池竜二, 朴昌根, 武井将志, 若木重行, 山本広佑, 橋爪光, 土山明, 瀬戸雄介, 長尾敬介, 野口高明, 海老原充, 奈良岡浩, 北島富美雄, 岡崎隆司, Ireland T.R., Zolensky M.E., 阿部正真, 藤村彰夫, 川口淳一郎, 向井利典, 上椙真之, 矢田達, 吉川真

日本惑星科学会秋期講演会予稿集　2011　15-15　2011/10/23
Publisher: 日本惑星科学会
S12-04 イトカワ母天体物質の起源(口頭セッション12:はやぶさ,口頭発表)

海老原充, 関本俊, 白井直樹, 浜島靖典, 山本政儀, 熊谷和也, 大浦泰嗣, Ireland Trever, 北島富美雄, 長尾敬介, 中村智樹, 奈良岡浩, 野口高明, 岡崎隆司, 土山明, 上椙真之, 圦本尚義, Zolensky Michael, 安部正真, 藤村彰夫, 向井利典, 矢田達

日本惑星科学会秋期講演会予稿集　2011　(2011)　16-16　2011/10/23
Publisher: 日本惑星科学会

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本文データは学協会の許諾に基づきCiNiiから複製したものである
S12-06 イトカワでのレゴリス生成と進化(口頭セッション12:はやぶさ,口頭発表)

土山明, 上椙真之, 松島亘志, 道上達弘, 門野敏彦, 中村智樹, 上杉健太朗, 中野司, Sandford Scott A., 野口遼, 松本徹, 松野淳也, 永野崇, 今井悠太, 竹内晃久, 鈴木芳生, 大神稔皓, 片桐淳, 海老原充, Ireland Trevor, 北島富美雄, 長尾敬介, 奈良岡浩, 野口高明, 岡崎隆司, 圦本尚義, Zolensky Michael, はやぶさキュレーションチーム

日本惑星科学会秋期講演会予稿集　2011　18-18　2011/10/23
Publisher: 日本惑星科学会
S12-07 イトカワでのレゴリス年代学(口頭セッション12:はやぶさ,口頭発表)

長尾敬介, 岡崎隆司, 中村智樹, 三浦弥生, 大澤崇人, 馬上謙一, 松田伸太郎, 海老原充, Ireland Trevor R., 北島富美雄, 奈良岡浩, 野口高明, 土山明, 上椙真之, 圦本尚義, Zolensky Michael E., 白井慶, 安部正真, 矢田達, 石橋之宏, 藤村彰夫, 向井利典, 上野宗孝, 岡田達明, 吉川真, 川口淳一郎

日本惑星科学会秋期講演会予稿集　2011　19-19　2011/10/23
Publisher: 日本惑星科学会
S12-09 Materials accumulating on the surface of asteroid Itokawa : Primitive carbonaceous matter

Sandford Scott A.

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2011　21-21　2011/10/23
Publisher: The Japanese Society for Planetary Sciences
S12-10 Materials accumulating on the surface of asteroid Itokawa : Organic compounds including amino acids

Sandford Scott

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2011　22-22　2011/10/23
Publisher: The Japanese Society for Planetary Sciences
Evaluation of the X-ray diffraction data obtained by a high-resolution synchrotron radiation Gandolfi camera and the application for the mineralogy

TANAKA Masahiko, NAKAMURA Tomoki, NOGUCHI T. Takaaki, KATSUYA Yoshio, MATSUSHITA Yoshitaka

2011　182-182　2011/09/05

ISSN： 1348-6543
美濃帯の上部三畳系遠洋性堆積岩中に記録された天体衝突の証拠

佐藤峰南, 尾上哲治, 中村智樹, 野口高明, 初川雄一, 大澤崇人, 小泉光生, 藤暢輔, 海老原充

日本地質学会学術大会講演要旨　118th　160　2011/09/05

DOI： 10.14863/geosocabst.2011.0.340.0 　

ISSN： 1348-3935
三畳紀新世における天体衝突と絶滅事変

尾上哲治, 佐藤峰南, 中村智樹, 野口高明, 初川雄一, 大澤崇人, 小泉光生, 藤暢輔, 海老原充

日本地質学会学術大会講演要旨　118th　15　2011/09/05

DOI： 10.14863/geosocabst.2011.0.53.0 　

ISSN： 1348-3935
SOLAR NOBLE GASES IN ITOKAWA REGOLITH MATERIALS RETURNED BY THE HAYABUSA MISSION

K. Nagao, R. Okazaki, T. Nakamura, Y. N. Miura, T. Osawa, K. Bajo, S. Matsuda, M. Ebihara, T. R. Ireland, F. Kitajima, H. Naraoka, T. Noguchi, A. Tsuchiyama, M. Uesugi, H. Yurimoto, M. E. Zolensky, K. Shirai, M. Abe, T. Yada, Y. Ishibashi, A. Fujimura, T. Mukai, M. Ueno, T. Okada, M. Yoshikawa, J. Kawaguchi

METEORITICS & PLANETARY SCIENCE　46　A171-A171　2011/07

ISSN： 1086-9379
EXAMINATION OF ORGANIC COMPOUNDS IN THE HAYABUSA SAMPLES FROM THE ASTEROID ITOKAWA

H. Naraoka, H. Mita, K. Hamase, M. Mita, H. Yabuta, K. Saito, K. Fukushima, F. Kitajima, S. A. Sandford, T. Nakamura, T. Noguchi, R. Okazaki, K. Nagao, M. Ebihara, H. Yurimoto, A. Tsuchiyama, M. Abe, K. Shirai, M. Ueno, T. Yada, Y. Ishibashi, T. Okada, A. Fujimura, T. Mukai, M. Yoshikawa, J. Kawaguchi

METEORITICS & PLANETARY SCIENCE　46　A175-A175　2011/07

ISSN： 1086-9379
ORIGIN AND EVOLUTION OF ITOKAWA REGOLITH PARTICLES BASED ON THREE-DIMENSIONAL SHAPES AND SIZES OF HAYABUSA SAMPLES

A. Tsuchiyama, M. Uesugi, T. Matsushima, T. Michikami, T. Kadono, T. Nakamura, K. Uesugi, T. Nakano, S. A. Sandford, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, A. Takeuchi, Y. Suzuki, T. Ogami, J. Katagiri, M. Ebihara, T. R. Ireland, F. Kitajima, K. Nagao, H. Naraoka, T. Noguchi, R. Okazaki, H. Yurimoto, M. E. Zolensky, T. Mukai, M. Abe, T. Yada, A. Fujimura, M. Yoshikawa, J. Kawaguchi

METEORITICS & PLANETARY SCIENCE　46　A240-A240　2011/07

ISSN： 1086-9379
HAYABUSA SAMPLE CURATION AT PLANETARY MATERIAL SAMPLE CURATION FACILITY IN JAXA

T. Yada, A. Fujimura, M. Abe, T. Nakamura, T. Noguchi, R. Okazaki, T. Okada, Y. Ishibashi, K. Shirai, M. E. Zolensky, S. Sandford, M. Uesugi, Y. Karouji, M. Ueno, T. Mukai, M. Yoshikawa, J. Kawaguchi

METEORITICS & PLANETARY SCIENCE　46　A257-A257　2011/07

ISSN： 1086-9379
THE ROLE OF SYNCHROTRON RADIATION-BASED X-RAY MICROTOMOGRAPHY IN EXAMINATION OF SMALL EXTRATERRESTRIAL SAMPLES RECOVERED BY SPACECRAFT IN THE Stardust AND HAYABUSA MISSIONS

A. Tsuchiyama, T. Nakamura, M. Uesugi, K. Uesugi, T. Nakano, A. Takeuchi, Y. Suzuki, Y. Iida, R. Niimi, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, T. Ogami, T. Noguchi, M. E. Zolensky, T. Mukai, M. Abe, T. Yada, A. Fujimura

METEORITICS & PLANETARY SCIENCE　46　A239-A239　2011/07

ISSN： 1086-9379
MINERALOGY AND THERMAL HISTROY OF ITOKAWA SURFACE PARTICLES RECOVERED BY HAYABUSA MISSION

T. Nakamura, T. Noguchi, M. Tanaka, M. E. Zolensky, M. Kimura, A. Tshuchiyama, A. Nakato, T. Ogami, H. Ishida, M. Uesugi, T. Yada, K. Shirai, A. Fujimura, R. Okazaki, S. Sandford, S. Wakita, Y. Ishibashi, M. Abe, T. Okada, M. Ueno, T. Mukai, M. Yoshikawa, J. Kawaguchi

METEORITICS & PLANETARY SCIENCE　46　A172-A172　2011/07

ISSN： 1086-9379
FIRST DIRECT EVIDENCE OF ASTEROIDAL SPACE WEATHERING FOUND ON THE SURFACE OF ITOKAWA PARTICLES

T. Noguchi, T. Nakamura, M. Kimura, M. E. Zolensky, M. Tanaka, T. Hashimoto, M. Konno, A. Nakato, T. Ogami, A. Fujimura, M. Abe, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi, R. Okazaki

METEORITICS & PLANETARY SCIENCE　46　A178-A178　2011/07

ISSN： 1086-9379
THE VARIETY OF THERMAL EVOLUTION OF PRIMITIVE HYDROUS ASTEROIDS RECORDED IN DEHYDRATED CARBONACEOUS CHONDRITES

A. Nakato, T. Nakamura, T. Noguchi, I. Ahn, J. I. Lee

METEORITICS & PLANETARY SCIENCE　46　A175-A175　2011/07

ISSN： 1086-9379
小惑星探査機はやぶさが回収したイトカワ微粒子の鉱物学的特性

中村智樹, 野口高明, 田中雅彦, ZOLENSKY Mike, 木村真, 中藤亜衣子, 大神稔皓, 石田初美, 土山明, 上椙真之, 矢田達, 白井慶, 岡崎隆司, 藤村彰夫, 石橋之宏, 安部正真, 岡田達明, 上野宗孝, 向井利典

PFシンポジウム要旨集　28th　4　2011
Mineralogical study of Itokawa dust particles recovered by spacecraft Hayabusa

Nakamura Tomoki, Uesugi Masayuki, Yada Toru, Shirai Kei, Okazaki Ryuji, Scott Sandford, Wakita Shigeru, Fujimura Akio, Ishibashi Yukihiro, Abe Masanao, Okada Tatsuaki, Noguchi Takaaki, Ueno Munetaka, Mukai Toshifumi, Yoshikawa Makoto, Kawaguchi Jun'ichiro, Tanaka Masahiko, Mike Zolensky, Kimura Makoto, Tsuchiyama Akira, Nakato Aiko, Ogami Toshihiro, Ishida Hatsumi

Annual Meeting of the Geological Society of Japan　2011　(0)　2-2　2011
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2011.0.2.0 　

ISSN： 1348-3935
Three-dimensional structures of Itokawa regolith particles and a role of X-ray microtomograhy in their preliminary examination

Tsuchiyama Akira, Noguchi Ryo, Matsumoto Toru, Matsuno Junya, Nagano Takashi, Imai Yuta, Takeuchi Akihisa, Suzuki Yoshio, Ogami Toshihiro, Katagiri Jun, Ebihara Mitsuru, Uesugi Masayuki, Ireland Trevor, Kitajima Fumio, Nagao Keisuke, Naraoka Hiroshi, Noguchi Takaaki, Okazaki Ryuji, Yurimoto Hisayoshi, Zolensky Michael, Mukai Toshifumi, Abe Masanao, Matsushima Takashi, Yada Toru, Fujimura Akio, Yoshikawa Makoto, Kawaguchi Jun'ichiro, Michikami Tatsuhiro, Kadono Toshihiko, Nakamura Tomoki, Uesugi Kentaro, Nakano Tsukasa, Sandford Scott

Annual Meeting of the Geological Society of Japan　2011　(0)　1-1　2011
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2011.0.1.0 　

ISSN： 1348-3935
Three-dimensional structures and shapes of regolith particles recovered from the asteroid Itokawa

Tsuchiyama Akira, Noguchi Ryo, Matsumoto Toru, Matsuno Junya, Nagano Takashi, Imai Yuta, Takeuchi Akihisa, Yoshio Suzuki, Ogami Toshihiro, Katagiri Jun, Ebihar Mitsuru, Uesugi Masayuki, Ireland Trevor, Kitajima Fumio, Nagao Keisuke, Naraoka Hiroshi, Noguchi Takaaki, Okazaki Ryuji, Yurimoto Hisayoshi, Zolensky Michael, Hayabusa Curation Team, Matsushima Takashi, Michikami Tatsuhiro, kadono Toshihiko, Nakamura Tomoki, Uesugi Kentaro, Nakano Tsukasa, Sandford Scott A

Abstracts of Annual Meeting of the Geochemical Society of Japan　58　(0)　169-169　2011
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.58.0.169.0 　

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Particles collected by the Hayabusa spacecraft are considered as regolith on the surface of asteroid Itokawa. Three-dimensional structures and shapes of these particles were obtained using X-ray microtomography at Spring-8 in the preliminary examination of Hayabusa sample. The modal abundance of minerals and density of whole particles are similar to those of LL chondrites. Any melting textures, such as agglutinates found in Luna regolith, were not observed. Size distribution and three-dimensional shape distribution are also different from those of Luna regolith. Based on these data, the formation and evolution of the regolith particles will be discussed.
小惑星イトカワの酸素同位体組成,²⁶Al初生存在度,微量元素組成

YURIMOTO HISAYOSHI, ITO SHOICHI, SAKAMOTO NAOYA, KOBAYASHI SACHIO, HASHIZUME KO, TSUCHIYAMA AKIRA, SETO YUSUKE, IRELAND T. R, ZOLENSKY M, NAKAMURA TOMOKI, NOGUCHI TAKAAKI, NAGAO KEISUKE, EBIHARA MITSURU, NARAOKA HIROSHI, OKAZAKI RYUICHI, KITAJIMA FUMIO, MUKAI TOSHIFUMI, FUJIMURA AKIO, ABE MASANAO, YADA TOORU, UESUGI MASAYUKI, YOSHIKAWA MAKOTO, KAWAGUCHI JUN'ICHIRO

日本地球化学会年会講演要旨集　58th　179-171　2011
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.58.0.171.0 　
331 「はやぶさ」回収カプセル受入れとキュレーション作業(オーラルセッション10 火星・小惑星)

藤村彰夫, 安部正真, 中村智樹, 野口高明, 岡崎隆司, 矢田達, 石橋之宏, 白井慶, 上野宗孝, 向井利典

日本惑星科学会秋期講演会予稿集　2010　82-82　2010/10/06
Publisher: 日本惑星科学会
Development of a high-resolution synchrotron radiation Gandolfi camera and the application for quantitative-phase analysis of mineral samples

TANAKA Masahiko, NAKAMURA Tomoki, NOGUCHI Takaaki, KATSUYA Yoshio, MATSUSHITA Yoshitaka

2010　93-93　2010/09/23

ISSN： 1348-6543
Preliminary examination plan for Hayabusa sample and its goal

TSUCHIYAMA Akira, EBIHARA Mitsuru, KITAJIMA Fumio, NAGAO Keisuke, NAKAMURA Tomoki, NARAOKA Hiroshi, NOGUCHI Takaaki, OKAZAKI Ryuji, UESUGI Masayuki, YURIMOTO Hisayoshi, HASPET members

日本鉱物科学会年会講演要旨集　2010　65-65　2010/09/23

DOI： 10.14824/jakoka.2010.0.64.0 　

ISSN： 1348-6543
THE WEAK THERMAL EVOLUTION OF THE PRIMITIVE HYDROUS ASTEROIDS RECORDED IN DEHYDRATED CM CARBONACEOUS CHONDRITES

A. Nakato, T. Nakamura, T. Noguchi, I. Ahn, J. I. Lee

METEORITICS & PLANETARY SCIENCE　45　A149-A149　2010/07

ISSN： 1086-9379
美濃帯の上部トリアス系チャートから発見したスフェルール及びNiに富むスピネル粒子

佐藤峰南, 尾上哲治, 中村智樹

日本地質学会学術大会講演要旨　117th　2010

ISSN： 1348-3935
はやぶさ回収サンプルのキュレーション作業(3)~ピックアップサンプルの観察~

中村智樹, 野口高明, 岡崎隆司, 藤村彰夫, 安部正真, 矢田達, 石橋之宏, 白井慶, 岡田達明, 上野宗孝, 向井利典

太陽系科学シンポジウム講演集録(CD-ROM)　32nd　ROMBUNNO.12GATSU21NICHI,3　2010
HAYABUSA sample curation

Fujimura Akio, Abe Masanao, Nakamura Tomoki, Noguchi Takaaki, Okazaki Ryuji, Yada Toru, Ishibashi Yukihiro, Shirai Kei

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2010　(0)　63-63　2010
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.14824/jakoka.2010.0.63.0 　

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'Hayabusa' re-entry capsule was safely carried into the clean room ofSagamihara Planetary Sample Curation Facility in JAXA. After executingCT scanning, removal of heat shield, and surface cleaning of samplecontainer, the sample container was enclosed into the clean chamber.After opening the sample container and residual gas sampling in theclean chamber, optical observation, sample recovery, sample separation for initial analysis will be carried. This curation work will becontinued with some selected member of Hayabusa Asteroidal SamplePreliminary Examination Team (HASPET) for several month. We report the'Hayabusa' capsule recovery operation and current status of curationwork for 'Hayabusa' sample.
104 隕石中の複合コンドリュールのX線CTによる3次元観察と、その形成過程の考察(オーラルセッション1 太陽系物質科学)

上椙真之, 中村智樹, 土`山明, 上杉健太朗

日本惑星科学会秋期講演会予稿集　2009　4-4　2009/09/28
Publisher: 日本惑星科学会
305 Development of the electrostatic micromanipulation system for material scientific studies of asteroids

小川真帆, 矢田達, 安部正真, 中村智樹, 藤村彰夫

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2009　56-56　2009/09/28
Publisher: 日本惑星科学会
306 Present status of the Planetary Sample Curation Facility in JAXA : Preparation for HAYABUSA's sample curation rehearsal operation

Fujimura A, Abe M, Yada T, Nakamura T, Okazaki R, Noguchi T, Tanaka S, Kobayashi N, Kato M

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2009　57-57　2009/09/28
Publisher: 日本惑星科学会
NO MEANINGFUL CORRELATION BETWEEN MINERALOGY AND NOBLE GAS COMPOSITIONS OF CARBONACEOUS MATERIALS IN SHISR 007 UREILITE

K. Ando, T. Nakamura, T. Noguchi, R. Okazaki, D. Nakashima, Y. Kakazu, F. Kitajima

METEORITICS & PLANETARY SCIENCE　44　A23-A23　2009/07

ISSN： 1086-9379
ADDITIONAL EVIDENCE FOR THE PRESENCE OF CHONDRULES IN COMET 81P/WILD 2

T. Nakamura, T. Noguchi, A. Tsuchiyama, T. Ushikubo, N. T. Kita, J. W. Valley, N. Takahata, Y. Sano, M. E. Zolensky, Y. Kakazu, K. Uesugi, T. Nakano

METEORITICS & PLANETARY SCIENCE　44　A153-A153　2009/07

ISSN： 1086-9379
STRENGTH MEASUREMENT OF CARBONACEOUS CHONDRITES AND MICROMETEORITES USING MICRO COMPRESSION TESTING MACHINE

A. Tsuchiyama, E. Mashio, Y. Imai, T. Noguchi, Y. Miura, H. Yano, T. Nakamura

METEORITICS & PLANETARY SCIENCE　44　A206-A206　2009/07

ISSN： 1086-9379
MINERALOGICAL AND CHEMICAL VARIATIONS RECORDED IN DEHYDRATED CARBONACEOUS CHONDRITES

A. Nakato, T. Nakamura, T. Noguchi

METEORITICS & PLANETARY SCIENCE　44　A155-A155　2009/07

ISSN： 1086-9379
Strength measurement of carbonaceous chondrites and micrometeorites using micro compression testing machine

Tsuchiyama Akira, Mashio Etsuko, Imai Yuta, Noguchi Taakaaki, Miura Yayoi, Yano Hajime, Nakamura Tomoki

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2009　(0)　216-216　2009
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.14824/jakoka.2009.0.216.0 　

ISSN： 1348-6543

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Tensile strengths of small pieces (&sim;100 μm) of carbonaceous chondrites (Murchison, Murray, Ivuna, Orgueil, and Targish Lake) were successively measured using a micro compression testing machine. The mean strengths are about 1-5 MPa and have a tendency of CM>CI>TL. The tensile strengths of seven scoriaceous micrometeorites (4 to 40 MPa) are larger than those of carbonaceous chondrites. Comparison with the strength of larger samples of Murchison may indicate a small size dependency.
Initial investigation of silica aerogel equipped on SM/MPAC & SEED recovered from the ISS in 2002, 2004, and 2005.

Noguchi, T, Nakamura, T, Kitazawa, Y, Yamanaka, R, Kimoto, Y, Suzuki, M

JAXA report　(JAXA-SP-08-015E)　59-66　2009
P117 Abundance of presolar grains in Ningqiang carbonaceous chondrite based on the noble-gas composition

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2008　108-108　2008/11/01
Publisher: The Japanese Society for Planetary Sciences

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Signatures of noble gas compositions in meteorites reflect the history of materials and there are a lot of noble-gas components. Exotic gases are contained in presolar grains such as diamond, graphite and silicon carbide (SiC). We analyzed mineralogy and noble gas compositions in acid residue of Ningqiang charbonaceous chondrite and discussed the precursor materials of meteorite parent bodies. Neon, Krypton and Xeon in acid residue were dominated by HL component. S component was not observed in all noble gas elements. These are consistent with that CV chondrite. Our results suggest that the parent body of Ningqiang had contained presolar grains that have similar ratio of diamond, graphite and SiC with CV chondrite.
Hydrothermal experiments of synthetic amorphous silicates with Cl chondritic composition in the systems with and without FeO

R. Noguchi, K. Murata, A. Tsuchiyama, H. Isobe, H. Chihara, T. Nakamura, T. Noguchi

METEORITICS & PLANETARY SCIENCE　43　(7)　A117-A117　2008/07

ISSN： 1086-9379
Mineralogical and stable isotope signatures of El-Quss Abu Said CM2 carbonaceous chondrite: Pristine material from outer asteroid belt

T. Nakamura, T. Noguchi, R. Okazaki, K. Jogo, K. Ohtsuka

METEORITICS & PLANETARY SCIENCE　43　(7)　A110-A110　2008/07

ISSN： 1086-9379
Evaluation of dehydration mechanism during heating of hydrous asteroids based on experimentally heated CM cohndrites

A. Nakato, T. Nakamura, F. Kitajima, T. Noguchi

METEORITICS & PLANETARY SCIENCE　43　(7)　A113-A113　2008/07

ISSN： 1086-9379
Mineralogical and noble gas compositional changes in the Ningqiang carbonaceous chondrite during experimetnal aqueous alteration with water vapor

Y. Yamamoto, T. Nakamura, T. Noguchi, K. Nagao

METEORITICS & PLANETARY SCIENCE　43　(7)　A173-A173　2008/07

ISSN： 1086-9379
Possible mineralogical variation of D-TYPE asteroids deduced from new type hydrous micrometeorites collected from Antarctic snow

K. Sakamoto, T. Nakamura, T. Noguchi, A. Tsuchiyama

METEORITICS & PLANETARY SCIENCE　43　(7)　A136-A136　2008/07

ISSN： 1086-9379
Mineralogy, chemistry, and isotope compositions of coarse-grained antarctic micrometeorites

R. Okazaki, T. Nakamura

METEORITICS & PLANETARY SCIENCE　43　(7)　A122-A122　2008/07

ISSN： 1086-9379
Hypervelocity experiments for sample return missions using silica aerogels as capture media

Okudaira Kyoko, Noguchi Takaaki, Hasegawa Sunao, Yano Hajime, Tabata Makoto, Nakamura Tomoki, Yamagishi Akihiko

Abstracts of Annual Meeting of the Geochemical Society of Japan　55　(0)　177-177　2008
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.55.0.177.0 　

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We report on our hypervelocity capture experiments for sample return missions using silica aerogels as capture media. Since aerogels are excellent thermal insulator, there is a possibility that samples might be thermally altered upon capturing. Thus empirical simulation in the lab is essential for rigorous examination of the captured samples. We fired hydrated phyllosilicate mineral particles which were susceptible to heat into aerogel by using two-stage light gas guns. After extraction from aerogel, several kinds of analyses were given to the samples to evaluate their alteration. We introduce results of our previous studies as well as those of preliminary experiments for TANPOPO mission.
Formation process of the Y-86009 CV3 carbonaceous chondrite: occurrence and formation age of secondary fayalites

Jogo Kaori, Nakamura Tomoki, Ito Motoo, Messenger Scott

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2008　(0)　210-210　2008
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.14824/jakoka.2008.0.210.0 　

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CV3 Y-86009 carbonaceous chondrite is a breccia consisting of numerous clasts. Secondary fayalites (Fa>80) occur as grains (5-50 μm) and veins (&sim;10 × 50 μum) in the host matrix and most clasts. These fayalites show different abundances and Fa compositions in the host matrix and in each clast, and fayalite-veins terminate at the clast boundaries. Thus, the fayalites should have already formed in various conditions of aqueous alteration prior to the Y-86009 breccia formation. Mn-Cr isotope analysis was performed on 15 fayalites in the host matrix and clasts. An absolute age was determined to be 4560 Ma. This age is consistent with other CV3 fayalite formation ages. These results imply that all CV3 fayalites formed by aqueous alteration at the same time in the same single CV3 asteroid.
Non-destructive analysis of Stardust particles using synchrotron radiation

NAKAMURA Tomoki, MIKOUCHI Takashi, TSUCHIYAMA Akira

Planetary people　16　(4)　285-289　2007/12/25
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X
Non-destructive analysis of cometary dust impact tracks using synchrotron radiation

TSUCHIYAMA Akira, NAKAMURA Tomoki

Planetary people　16　(4)　281-284　2007/12/25
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X
A study of Stardust tracks using synchrotron radiation : estimation of impact cometary dust

TSUCHIYAMA Akira, IIDA Yosuke, OKAZAKI Takahide, NAKAMURA Tomoki, JOGO Kaori, SAMAMOTO Kanako, KAZUKI Yuuki, KADONO Toshihiko, UESUGI Kentaro, NAKANO Tsukasa, NOGUCHI Takaaki

2007　78-78　2007/09/22

ISSN： 1348-6543
Three-dimensional structures of micrometeorites and model dust particles: Porosities and fractal dimensions

A. Tsuchiyama, T. Okazaki, K. Murata, K. Wada, H. Kimura, T. Noguchi, T. Nakamura, T. Nakano, K. Uesugi

METEORITICS & PLANETARY SCIENCE　42　A151-A151　2007/08

ISSN： 1086-9379
Crystalline silicate formation in protoplanetary disks : heating experiments of amorphous silicate

MURATA Keisuke, CHIHARA Hiroki, TSUCHIYAMA Akira, KOIKE Chiyoe, TAKAKURA Takashi, NOGUCHI Takaaki, NAKAMURA Tomoki

Planetary people　16　(2)　119-127　2007/06/25
Publisher: The Japanese Society for Planetary Sciences
ISSN： 0918-273X
A possibility for the depletion of siderphile elements in chondrules due to the expulsion of iron globules

Uesugi Masayuki, Sekiya Minoru, Nakamura Tomoki, Saiki Kazuto, Tsuchiyama Akira

Abstracts for fall meeting of the Japanese Society for Planetary Science　2007　(0)　72-72　2007
Publisher: THE JAPANESE SOCIETY FOR PLANETARY SCIENCES
DOI： 10.14909/jsps.2007f.0.72.0 　

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Separation of iron globules from chondrules during chondrule formation process is investigated kinematically. The results of calculation show that if those iron globules were initially inside and transported to the surface of the chondrule, most of them would be expelled from inside to outside due to the surface tension force. The results show a possibility that this process may be responsible for the depletion of siderophile elements in natural chondrules.
Three Dimensional Multifractal Analyses of Micro Meteorites using SR Microtomography

OKAZAKI Takahide, ENDO Noritaka, TSUCHIYAMA Akira, NAKANO Tsukasa, UESUGI Kentaro, NOGUCHI Takaaki, NAKAMURA Tomoki

21　(2)　174-175　2006/10/01

ISSN： 0915-6089
Microchondrules within a troilite-rich rim around a chondrule in the Yamato-790448 LL3 chondrite

R. Okazaki, T. Nakamura

METEORITICS & PLANETARY SCIENCE　41　(8)　A135-A135　2006/08

ISSN： 1086-9379
Temperature dependence on the effects of aqueous alteration on mineralogy and noble gas compositions in carbonaceous chondrite Ningqiang

Y. Yamamoto, T. Nakamura, T. Noguchi, K. Nagao

METEORITICS & PLANETARY SCIENCE　41　(8)　A193-A193　2006/08

ISSN： 1086-9379
Mineralogy and oxygen isotope signatures of the Asuka-881020 CH chondrite

T. Nakamura, T. Noguchi, T. Akaki

METEORITICS & PLANETARY SCIENCE　41　(8)　A128-A128　2006/08

ISSN： 1086-9379
El-Quss Abu Said: A CM2 carbonaceous chondrite with decomposed phyllosilicates

T. Nakamura, T. Noguchi, R. Okazaki, K. Jogo, K. Ohtsuka

METEORITICS & PLANETARY SCIENCE　41　(8)　A212-A212　2006/08

ISSN： 1086-9379
Secondary fayalite in the Vigarano CV3 carbonaceous chondrite: Occurrence and formation age

K. Jogo, T. Nakamura, T. Noguchi

METEORITICS & PLANETARY SCIENCE　41　(8)　A88-A88　2006/08

ISSN： 1086-9379
Effects of experimental aqueous alteration on the abundances of argon-rich noble gases in the Ningqiang carbonaceous chondrite

YAMAMOTO Yukio, OKAZAKI Ryuji, NAKAMURA Tomoki

Meteorit Planet Sci　41　(4)　541-551　2006/04

ISSN： 1086-9379
Infrared Microspectroscopy of Organics and Hydrous Components in Antarctic Micrometeorites

Suzuki Akiko, Kebukawa Yoko, Nakashima Satoru, Nakamura Tomoki

Abstracts for fall meeting of the Japanese Society for Planetary Science　2006　(0)　109-109　2006
Publisher: THE JAPANESE SOCIETY FOR PLANETARY SCIENCES
DOI： 10.14909/jsps.2006f.0.109.0 　

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Some Antarctic Micrometeorites (AMMs) were studied non-destructively by infrared (IR) microspectroscopy for characterizing organic and hydrous components in these particles. Their IR spectra showed absorption peaks of OH (molecular water) at 3400 cm−1, aliphatic carbonaceous components at 2960 cm−1 for CH3 and 2925 and 2860 cm−1 for CH2. By using peak height ratios of CH3/CH2 (2960 cm−1/2925 cm−1) and OH/CH2 (3400 cm−1/2925 cm−1), aliphatic and hydrous component characters of AMMs can be quantitatively investigated. The CH3/CH2 and OH/CH2 ratios of AMMs are ranging 0.6-0.9 and 1-3, respectively. These ratios of AMMs are smaller than those of carbonaceous chondrites. In order to study effects of heating, an AMM was heated in-situ under the IR microscope in atmosphere at temperatures from room temperature (RT) to 600˚C. The peak height ratio of CH3/CH2 remained mostly unchanged from RT to 210˚C and increased from 210˚C to 300˚C. The OH/CH2 ratio decreased from RT to 210˚C and then increased greatly from 210˚C to 300˚C. Effects of aqueous altaeration on micrometeorites are now being studied by hydrothermal experiments on simulated mineral-organic compounds.
Sampling Technology and Scientific Objectives for Minor Body Sample Return Missions after Hayabusa

YANO Hajime, HASEGAWA Sunao, Minor Body Exp. WG Sampling Sub-Group, NOGUCHI Takaaki, MATSUNAGA Saburo, Fujii Hirohisa, MIURA Yayoi, MORI Osamu, TSUCHIYAMA Akira, NARAOKA Hiroshi, NAKAMURA Tomoki

Abstracts for fall meeting of the Japanese Society for Planetary Science　2006　(0)　79-79　2006
Publisher: THE JAPANESE SOCIETY FOR PLANETARY SCIENCES
DOI： 10.14909/jsps.2006f.0.79.0 　

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As a post-Hayabusa mission in 2010's, our working group has been developing a new sampling system for C-type and other primitive asteroid surface and sub-surface materials, based upon technology and operation established and lessons learned by Hayabusa's touch-and-go sampling attempt at the S-type asteroid Itokawa in 2005. Both impact sampling with corer projectiles and a microgravity tether retraction system are under the development as well as shaped charge excavation on free asteroidal surface. This study summarizes results of those endeavors and future prospects of this challenge.
Mineralogy of 100-microgram powder test samples II: Evolved procedures for the initial analysis of regolith materials of the Asteroid Itokawa

Nakamura T, Noguchi T, Tanaka, M

JAXA report　(JAXA-SP-05-021E)　5-74　2006
Post-hydration thermal metamorphism of carbonaceous chondrites

Tomoki Nakamura

Journal of Mineralogical and Petrological Sciences　100　(6)　260-272　2005/12

DOI： 10.2465/jmps.100.260 　

ISSN： 1345-6296 1349-3825
Mineralogy of ultracarbonaceous large micrometeorites

T Nakamura, T Noguchi, Y Ozono, T Osawa, K Nagao

METEORITICS & PLANETARY SCIENCE　40　(9)　A110-A110　2005/09

ISSN： 1086-9379
Compound chondrule formation in the primitive solar nebula

Uesugi Masayuki, Akaki Takeshi, Sekiya Minoru, Nakamura Tomoki

Abstracts for fall meeting of the Japanese Society for Planetary Science　2005　(0)　101-101　2005
Publisher: THE JAPANESE SOCIETY FOR PLANETARY SCIENCES
DOI： 10.14909/jsps.2005f.0.101.0 　

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Chondrules are igneous submillimeter sized spherical object, which observed in primitive meteorites. We report the results of examinations for the formation process of compound chondrules in chondrule formation region.
3-D observation of interplanetary dust particles using microtomography

TSUCHIYAMA Akira, NAKAMURA Keiko, NAKAMURA Tomoki, NOGUCHI Takaaki, UESUGI Kentaro, NAKANO Tsukasa

2004　144-144　2004/09/22

ISSN： 1348-6543
Mineralogy of Asuka 881020 CH3 chondrite

NOGUCHI Takaaki, NAKAMURA Tomoki, KIMURA Makoto, IMAE Naoya

2004　149-149　2004/09/22

ISSN： 1348-6543
Formation and evolution of hydrous planetesimals

NAKAMURA Tomoki, OKAZAKI Ryuji, NAGAO Keisuke

2004　172-172　2004/09/22

ISSN： 1348-6543
Characteristics of phyllosilicates in micrometeorites derived from synchrotron X-ray diffraction analysis

T Nakamura, T Noguchi

METEORITICS & PLANETARY SCIENCE　39　(8)　A76-A76　2004/08

ISSN： 1086-9379
隕石から取り出した微小試料の鉱物学的研究 –放射光X線回折と透過電子顕微鏡観察の統合－

野口高明, 中村智樹

月刊地球　26　(9)　641-646　2004
Publisher: 海洋出版
ISSN： 0387-3498
放射光イメージングを用いた地球外微小サンプルの分析―リターンサンプルへの応用

土山明, 中村健太郎, 上杉健太朗, 中野司, 矢野創, 奥平恭子, 中村圭子, 野口高明, 中村智樹

日本惑星科学会秋季講演会予稿集　2004　(0)　114-111　2004
Publisher: 日本惑星科学会
DOI： 10.14909/jsps.2004f.0.111.0 　

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Analytical methods using synchrotron radiation imaging for extraterrestrial small samples, such as micrometeorites and IDPs, have been developed. Observation of dust tracks as well as dust particles in an aerogel dust collector is possible by micro-radiography using refraction imaging. This method can be applied to Stardust mission sample, which will be returned from comet Wild-2 in January, 2006. Density measurement of micrometeorites by micro-tomography can be applied to Hayabusa mission sample, which will be returned from S-type asteroid ITOKAWA in June, 2007.
Evaluation of mineralogical alteration of micrometeoroid analog materials captured in aerogel

K. Okudaira, T. Noguchi, T. Nakamura, S. Sugita, Y. Sekine, H. Yano

Advances in Space Research　34　(11)　2299-2304　2004

DOI： 10.1016/j.asr.2004.06.003 　

ISSN： 0273-1177
Kusakabe M., Maruyama S., Nakamura T., and Yada T. An oxygen isotope analytical system for rocks and minerals using a CO2 Laser-BrF5 fluorination Technique.

Journal of the Mass Spectrometry Society of Japan　52, 205-212　2004

DOI： 10.5702/massspec.52.205 　
The global accretion rate of extraterrestrial materials in the last glacial period estimated from the abundance of micrometeorites in Antarctic glacier ice

T Yada, T Nakamura, N Takaoka, T Noguchi, K Terada, H Yano, T Nakazawa, H Kojima

EARTH PLANETS AND SPACE　56　(1)　67-79　2004

DOI： 10.1186/BF03352491 　

ISSN： 1880-5981
Evidence against the nebular shock model of chondrule formation

M Uesugi, T Akaki, M Sekiya, T Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA　67　(18)　A502-A502　2003/09

ISSN： 0016-7037
CI-like chondrite clasts in ordinary chondrite regolith breccias and their implication to the investigation of the surface material of asteroids

T Noguchi, T Nakamura, D Nakashima, A Inada, K Nagao

GEOCHIMICA ET COSMOCHIMICA ACTA　67　(18)　A341-A341　2003/09

ISSN： 0016-7037
Early aqueous alteration of hydrous asteroids inferred from Sayama CM2 chondrite

T Nakamura, T Noguchi, M Sekiya, S Yoneda

GEOCHIMICA ET COSMOCHIMICA ACTA　67　(18)　A327-A327　2003/09

ISSN： 0016-7037
Formation history of CI-like phyllosilicate-rich clasts in the Tsukuba meteorite inferred from mineralogy and noble gas signatures

D Nakashima, T Nakamura, T Noguchi

EARTH AND PLANETARY SCIENCE LETTERS　212　(3-4)　321-336　2003/07

DOI： 10.1016/S0012-821X(03)00282-6 　

ISSN： 0012-821X
Noble gases in ureilites released by crushing

R Okazaki, T Nakamura, N Takaoka, K Nagao

METEORITICS & PLANETARY SCIENCE　38　(5)　767-781　2003/05

DOI： 10.1111/j.1945-5100.2003.tb00041.x 　

ISSN： 1086-9379

eISSN： 1945-5100
Acid-susceptive material as a host phase of argon-rich noble gas in the carbonaceous chondrite Ningqiang

T Nakamura, M Zolensky, M Sekiya, R Okazaki, K Naga

METEORITICS & PLANETARY SCIENCE　38　(2)　243-250　2003/02

DOI： 10.1111/j.1945-5100.2003.tb00262.x 　

ISSN： 1086-9379

eISSN： 1945-5100
A primitive dark inclusion with radiation-damaged silicates in the Ningqiang carbonaceous chondrite

M Zolensky, K Nakamura, MK Weisberg, M Prinz, T Nakamura, K Ohsumi, A Saitow, M Mukai, M Gounelle

METEORITICS & PLANETARY SCIENCE　38　(2)　305-322　2003/02

DOI： 10.1111/j.1945-5100.2003.tb00266.x 　

ISSN： 1086-9379

eISSN： 1945-5100
Yamato 86029: Aqueously altered and thermally metamorphosed CI-like chondrite with unusual textures

EK Tonui, ME Zolensky, ME Lipschutz, MS Wang, T Nakamura

METEORITICS & PLANETARY SCIENCE　38　(2)　269-292　2003/02

DOI： 10.1111/j.1945-5100.2003.tb00264.x 　

ISSN： 1086-9379

eISSN： 1945-5100
Mineralogy and noble-gas signatures of the carbonate-rich lithology of the Tagish Lake carbonaceous chondrite: evidence for an accretionary breccia

T Nakamura, T Noguchi, ME Zolensky, M Tanaka

EARTH AND PLANETARY SCIENCE LETTERS　207　(1-4)　83-101　2003/02

DOI： 10.1016/S0012-821X(02)01127-5 　

ISSN： 0012-821X
Mineralogy of 100-mg test samples for Muses C mission. in "The First Open Competition for the MUSES-C Asteroidal Sample Preliminary Examination Team"

Nakamura T, Noguchi T

ISAS report　(16)　103-120　2003
Nakashima D., Nakamura T., and Noguchi T. Formation history of CI-like phyllosilicate-rich clasts in the Tsukuba meteorite inferred from mineralogy and noble gas signatures.

Earth and Planetary Science Letters　212　321-336　2003
Acid-susceptive material as a host phase of argon-rich noble gas in the carbonaceous chondrite Ningqiang

Tomoki Nakamura, Michael Zolensky, Minoru Sekiya, Ryuji Okazaki, Keisuke Nagao

Meteoritics and Planetary Science　38　(2)　243-250　2003
Publisher: University of Arkansas
DOI： 10.1111/j.1945-5100.2003.tb00262.x 　

ISSN： 1086-9379
Mineralogy of phyllosilicate-rich micrometeorites and comparison with Tagish Lake and Sayama meteorites

T Noguchi, T Nakamura, W Nozaki

EARTH AND PLANETARY SCIENCE LETTERS　202　(2)　229-246　2002/09

DOI： 10.1016/S0012-821X(02)00777-X 　

ISSN： 0012-821X
Variety of mineralogy among antarctic micrometeorites: Comparison with hydrated carbonaceous chondrites.

T Noguchi, T Nakamura, W Nozaki

METEORITICS & PLANETARY SCIENCE　37　(7)　A111-A111　2002/07

ISSN： 1086-9379
Formation history of CI-like phyllosilicate-rich clasts in the Tsukuba meteorite inferred from mineralogy and noble gas signature.

D Nakashima, T Nakamura, T Noguchi

METEORITICS & PLANETARY SCIENCE　37　(7)　A108-A108　2002/07

ISSN： 1086-9379
Nakashima D., Nakamura T., Sekiya M., and Takaoka M. Cosmic ray exposure age and heliocentric distance of the parent body of H chondrites Yamato-75029 and Tsukuba.

Antarctic Meteorite Research　15, 97-113　2002
Okudaira K., Noguchi T. Nakamura T., Suguta S., Sekine Y., and Yano H. Post retrieval analysis techniques for micrometeoroid and debris samples captured in aerogels onboard the international space station.

Proceedings of the twenty-third international symposium on space technology and science　2307-2311　2002
Okudaira K., Noguchi T. Nakamura T., Suguta S., Sekine Y., and Yano H. Post retrieval analysis techniques for micrometeoroid and debris samples captured in aerogels onboard the international space station.

Proceedings of the twenty-third international symposium on space technology and science　2307-2311　2002
Noble gases in the Kobe CK4 carbonaceous chondrite

N Takaoka, T Nakamura, K Nagao, N Nakamura

GEOCHEMICAL JOURNAL　36　(4)　355-368　2002

ISSN： 0016-7002

eISSN： 1880-5973
Evaluating the thermal metamorphism of CM chondrites by using the pyrolytic behavior of carbonaceous macromolecular matter

F Kitajima, T Nakamura, N Takaoka, T Murae

GEOCHIMICA ET COSMOCHIMICA ACTA　66　(1)　163-172　2002/01

ISSN： 0016-7037
Noble gases in the Kobe CK4 carbonaceous chondrite

N. Takaoka, T. Nakamura, K. Nagao, N. Nakamura

Geochemical Journal　36　(4)　355-368　2002
Publisher: The Physiological Society of Japan
DOI： 10.2343/geochemj.36.355 　

ISSN： 0016-7002
Three-dimensional description of the Kobe meteorite by micro X-ray CT method: Possibility of three-dimensional curation of meteorite samples

A Tsuchiyama, T Nakamura, T Nakano, N Nakamura

GEOCHEMICAL JOURNAL　36　(4)　369-390　2002

ISSN： 0016-7002

eISSN： 1880-5973
Nakashima D., Nakamura T., Sekiya M., and Takaoka M. Cosmic ray exposure age and heliocentric distance of the parent body of H chondrites Yamato-75029 and Tsukuba.

Antarctic Meteorite Research　15, 97-113　2002
708 Origin of micrometeorites estimated from their chemical and isotopic composition

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2001　115-115　2001/10/06
Publisher: The Japanese Society for Planetary Sciences

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Antarctic Micrometeorites are analyzed by electron microprobe for chemical composition of major elements and by ion microprobe for oxygen isotopic ratio. Results of both analyses indicate that micrometeorites are closely related to parent bodies of carbonaceous chondrites.
403 The equilibrium shape of a chondrule containing metalic iron

Uesugi Masayuki, Sekiya Minoru, Nakamura Tomki

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2001　51-51　2001/10/06
Publisher: The Japanese Society for Planetary Sciences

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Some of chondrules, a major component of ordinary chondrites, have distinctive shapes which indicate they were spinning during their formation with considerable angular velocities. We may add some new constraints to the chondrule formation model by analyzing these features. In this study, we formulate to calculate shapes of the chondrules with metallic iron spheres protruding their surface. We discuss the preliminary solutions of these analysis.
Ueda T., Murakami Y., Ishitsu N., Kawabe H., Inoue R., Nakamura T., Sekiya M. and Takaoka N. Collisional destruction experiment of chondrules and formation of fragments in the solar nebula.

Earth Planet. Sci.　53, 927-935　2001
Nakamura T., Noguchi T., Yada T., Nakamuta Y. and Takaoka N. Bulk mineralogy of individual micrometeorites by X-ray diffraction analysis and transmisson electron microscopy.

Geochim. Cosmochim. Acta　65, 4385-4397　2001
Noble gas composition of enstatite chondrites

Antarctic Meteorite Research　10　83-89　2001
Mineralogical study of cosmic dust using synchrotron radiation

NAKAMURA Tomoki, NOZAKI Wataru, NAKAMUTA Yoshihiro

Japanese Magazine of Mineralogical and Petrological Sciences　30　(2)　84-85　2001
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.2465/gkk.30.84 　

ISSN： 1345-630X
Nakamura T., Nakamuta Y., and Tanaka M. Identification of anhydrous and hydrous interplanetary dust particles by X-ray diffraction analysis.

In Photon Factory Activity, Report 2000, Part A (Highlights and Facility, Report #18), Section 6 Crystallography (ed. by Ohsumi K), KEK Progress Report　2001-2, 30-31　2001
エンスタタイトコンドライトの希ガス同位体組成

遊星人(日本惑星科学会誌)　10　83-89　2001
Ueda T., Murakami Y., Ishitsu N., Kawabe H., Inoue R., Nakamura T., Sekiya M. and Takaoka N. Collisional destruction experiment of chondrules and formation of fragments in the solar nebula.

Earth Planet. Sci.　53, 927-935　2001
Nakamura T., Noguchi T., Yada T., Nakamuta Y. and Takaoka N. Bulk mineralogy of individual micrometeorites by X-ray diffraction analysis and transmisson electron microscopy.

Geochim. Cosmochim. Acta　65, 4385-4397　2001
Mineralogical study of cosmic dust using synchrotron radiation

30　84-85　2001
General characterization of Antarctic micrometeorites collected by the 39th Japanese Antarctic Research Expedition : Consortium studies of JARE AMMs((]G0003[)).

Antarctic Meteorite Research　14　89-107　2001
Nakamura T., Nakamuta Y., and Tanaka M. Identification of anhydrous and hydrous interplanetary dust particles by X-ray diffraction analysis.

In Photon Factory Activity, Report 2000, Part A (Highlights and Facility, Report #18), Section 6 Crystallography (ed. by Ohsumi K), KEK Progress Report　2001-2, 30-31　2001
Okazaki R., Takaoka N., Nagao K., Sekiya M., Nakamura T. Finding of noble-gas-rich chondrules in an enstatite chondrite.

Nature　412, 795-798　2001
Okazaki R., Takaoka N., Nagao K., Sekiya M., Nakamura T. Finding of noble-gas-rich chondrules in an enstatite chondrite.

Nature　412, 795-798　2001
Impact-induced textural changes of CV carbonaceous chondrites: Experimental reproduction

T Nakamura, K Tomeoka, N Takaoka, T Sekine, H Takeda

ICARUS　146　(1)　289-300　2000/07

DOI： 10.1006/icar.2000.6385 　

ISSN： 0019-1035
Deformation-sensitive luminescence of forsterite (Mg-2 SiO4) shocked up to 82 CPa

Shinno, I, T Nakamura, T Sekine

JOURNAL OF LUMINESCENCE　87-9　1292-1294　2000/05

DOI： 10.1016/S0022-2313(99)00592-X 　

ISSN： 0022-2313
実験的手法による小惑星レゴリスの研究

遊星人(日本惑星科学会誌)　9　197-215　2000
Solar-wind derived light noble gases in micrometeorite collected at the Dome Fuji Station : characterization by stepped pyrolysis.

Antarctic Meteorite Research　13　311-321　2000
Thermal effects on mineralogy, noble-gas composition, and carbonaceous material in CM chondrites.

NKAMURA T.

In Workshop on Extraterrestrial Materials from cold and Hot Deserts LPI Contribution　997　(997)　61-63　2000
Publisher: Lunar and Planetary Institute Contribution Lunar and Planetary Institute
Characterization of Antarctic micrometeorites collected at the Dome Fuji station by synchrotron radiation X-ray fluorescence analysis.

Nakai Izumi, Kondo Nahoko, Itabashi Masato, Sasaki Miho, Terada Yasuko, Terada Kentaro, Noguchi Takaaki, Nakamura Tomoki

Antarctic Meteorite Research　13　302-310　2000
Cosmic-ray exposure ages of enstatite chondrites.

Okazaki Ryuji, Takaoka Nobuo, Nakamura Tomoki, Nagao Keisuke

Antarctic Meteorite Research　13　153-169　2000
Publisher: National Institute of Polar Research
ISSN： 1343-4284

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Eleven enstatite (E-) chondrites were analyzed for abundances and isotopic ratios of noble gases by total melting. Light noble gases, He, Ne and Ar are discussed. We obtained cosmic-ray exposure ages (T^<21>) based on cosmogenic ^<21>Ne that are divided into two groups, below 15 Myr and above 40 Myr. Both ranges of T^<21> contain various petrologic-types of E-chondrites. Isotopic ratios and concentration of Ne for Yamato (Y)-8414 and -86004 are almost the same, which suggests that they are from a common fragment. Identical exposure age T^<21> of 10 Myr for Y-8414 and -86004 supports their pairing. The pairing for Y-8414 and -86004 based on noble-gas signatures and T^<21> is consistent with their petrologic similarities. Pairing for Y-792959 and -793161 is also suggested by their similarities in mineral compositions, their close sampling location and the same petrologic-type. However, there are discrepancies in He and Ar contents between the two samples, which fails to support their pairing. Including literature data, the exposure ages show no systematic correlation with petrologic type. Additionally, both EH-and EL-chondrites are found in both two peaks of T^<21>. The exposure age distribution has no implications about the structure of E-chondrite parent body. The parent body of E-chondrites has possibly lost the original structure after many collisions in the early solar system evolution.
A consortium study of antarctic micrometeorites recovered from the Dome Fuji Station.

Noguchi Takaaki, Imae Naoya, Nakamura Tomoki, Nozaki Wataru, Terada Kentaro, Mori Takeshi, Nakai Izumi, Kondo Nahoko, Sasaki Miho, Murakami Toshio, Fukuoka Takaaki, Nogami Ken-ichi, Ohmori Rie, Ohashi Hideo

Antarctic Meteorite Research　13　270-284　2000
Mineralogy of Antarctic micrometeorites recovered from the Dome Fuji Station.

Antarctic Meteorite Research　13　285-301　2000
Noble gas measurement in individual micrometeorites using laser gas-extraction system.

Osawa Takahito, Nagao Keisuke, Nakamura Tomoki, Takaoka Nobuo

Antarctic Meteorite Research　13　322-341　2000
Publisher: National Institute of Polar Research
ISSN： 1343-4284

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All noble gases in 12 individual Antarctic micrometeorites, series F96C and F96D, taken from a water tank at the Dome Fuji Station, were measured by using Nd-YAG CW laser-extraction system. According to the results of light noble gases, the micrometeorites can be separated into two groups, "gas-rich" and "gas-poor". Samples in the gas-rich group have SEP-like ^3He/^4He ratios and Ne isotopic ratios between SEP- and Solar wind-Ne, which are consistent with previous reports on micrometeorites or IDPs. On the other hand, samples in the gas-poor group have very low ^3He/^4He ratios and ^<20>Ne/^<22>Ne ratios lower than the atmospheric values. The ^<40>Ar/^<36>Ar ratios are also separated into two groups, i. e., samples with lower ^<40>Ar/^<36>Ar belong to the gas-rich group. Cosmogenic noble gases were undetected in all the samples and cosmic-ray exposure ages may be shorter than 4.5Ma considering error limits of Ne data. Heavy noble gas elemental compositions are chondritic. There was no correlation between the concentration of volatile elements, sulfur, and that of He and Ne.
Characterization of artificially shocked forsterites : (3) profile analysis of Raman spectra.

SHINNO Isamu, NAKAMUTA Yoshihiro, NAKAMURA Tomoki, SEKINE Toshimori

Mineralogical Journal　22　(1)　11-20　2000
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.2465/minerj.22.11 　

ISSN： 0544-2540 1881-4174

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Synthetic single crystal forsterites have been shocked up to 82GPa and examined by profile analysis of Raman spectra. Raman bands due to Si–O external vibrations of translational and rotational modes are shifted to higher frequencies with the increase of shock pressure without band broadening. At the internal vibration of Si–O stretching modes, the bands show no shift up to 46GPa, while above that pressure they are shifted to the higher frequencies with distinguishable band broadening. Although Mg(M2)–O translational band is not shifted, its band broadening increases linearly with increasing shock pressure. Over the shock pressure of 46GPa, the Mg–O band is shifted gradually to the lower frequencies as opposed to that all of the internal bands of υ 1 to υ 4 have tendency to move to higher frequencies, whereas the Mg–O band width is doubled. These variations indicate that the lattice deformation resides heterogeneously in the crystal structure of the shocked forsterite, in which the SiO₄ tetrahedron is compressed differently between the pressure ranges below and above the 46GPa in the plastic region. In the lower shock region, plastic deformation is caused mainly by the translational and rotational strain, while over the shock pressure of 46GPa, abrupt plastic changes occur in both tetrahedral and octahedral polyhedra, causing positive and negative residual stresses in the structure, respectively. The transition pressure of 46GPa coincides nearly with the onset pressure of phase transition, 50GPa, on the pressure-density Hugoniot of shocked forsterite (Syono et al., 1981).
603 Relationships between the pyrolytic features of CM chondritic carbonaceous matter and thermal methamorphism

Kitajima F., Nakamura T., Takaoka N., Murae T.

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　1999　76-76　1999/11/13
Publisher: The Japanese Society for Planetary Sciences
微量元素による宇宙塵の特性化の試み

中井泉, 板橋将人, 佐々木美穂, 寺田靖子, 寺田健太郎, 野口高明, 中村智樹

日本岩石鉱物鉱床学会学術講演会講演要旨集　1999　1999
Heterogeneous distribution of solar and cosmogenic noble gases in CM chondrites and implications for the formation of CM parent bodies

T Nakamura, K Nagao, K Metzler, N Takaoka

GEOCHIMICA ET COSMOCHIMICA ACTA　63　(2)　257-273　1999/01

DOI： 10.1016/S0016-7037(98)00278-6 　

ISSN： 0016-7037
Antarctic micrometeorites collected at the Dome Fuji station

Antarctic Meteorite Research　12　184-198　1999
Cosmic Dust Recovery from the Space, the Stratosphere, and the South Pole Regions

NAKAMURA Tomoki, ZOLENSKY M. E., IMAE Naoya

Journal of the Mineralogical Society of Japan　28　(3)　95-102　1999
Publisher: 日本鉱物学会
DOI： 10.2465/gkk1952.28.95 　

ISSN： 0454-1146 1883-7018
Cosmic dust collected in space, stratosphere, and Antarctica

28　95-102　1999
Trace element concentrations in iron-type cosmic spherules determined by the SR-XRF method

Antarctic Meteorite Research　12　200-213　1999
Characterization of artificially shocked forsterites : (2) Profile analysis of photo-luminescence spectra

SHINNO Isamu, NAKAMUTA Yosihiro, NAKAMURA Tomoki, SEKINE Toshimori

Mineralogical Journal　21　(3)　119-130　1999
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.2465/minerj.21.119 　

ISSN： 0544-2540 1881-4174

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Synthetic single crystals of forsterite shocked up to 82.0GPa have been examined by the profile analysis of photo-luminescence spectra. The forsterites give rise eight broad bands in photo-luminescence spectra in contrast to unshocked forsterite having usually faint and obscure luminescence. Their intensity increases linearly with increasing the pressure up to 46.2GPa, while over the pressure the intensity abruptly decreases. The intensity variation also has a close relationship to Raman band shift and broadening, implying the variable degree of lattice deformation in shocked forsterites. The critical shock pressure of 46.2 GPa nearly corresponds to the onset shock pressure of phase transition (50GPa) on the Hugoniot curve of forsterite (Syono et al., 1981). Luminescence mechanism in the shocked forsterite may be the emission transition between the deformed electron levels with vibrational sub-levels in its [SiO₄]⁴⁻ molecular orbitals. This is a new type of photo-luminescence in silicate minerals that can be called as the deformation luminescence. The correlation between the intensity of photo-luminescence and shock pressure loaded on the forsterites is formulated, and applied to estimate the shock pressure of Dhurmsala LL6 chondrite; it ranges from 26 to 29 GPa.
Microdistribution of primordial noble gases in CM chondrites determined by in situ laser microprobe analysis: Decipherment of nebular processes

T Nakamura, K Nagao, N Takaoka

GEOCHIMICA ET COSMOCHIMICA ACTA　63　(2)　241-255　1999/01

DOI： 10.1016/S0016-7037(98)00275-0 　

ISSN： 0016-7037
Characterization of artificially shocked forsterites : (1) Diffraction profile analysis by Gadolfi camera

UCHIZONO Atsushi, SHINNO Isamu, NAKAMUTA Yoshihiro, NAKAMURA Tomoki, SEKINE Toshimori

Mineralogical Journal　21　(1)　15-23　1999
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.2465/minerj.21.15 　

ISSN： 0544-2540 1881-4174

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We have examined synthetic single crystals of forsterites shocked up to 82GPa using a single stage propellant gun. Even in forsterites shocked to 82GPa, any decomposition phases such as spinels or silica glasses and fine-grained MgO could not be detected by X-ray diffraction and EPMA methods. Profile analysis of X-ray diffraction peaks of the shocked forsterites using a Gandolfi camera has been done to detect the maximum strain. The maximum strain derived from Williamson-Hall plot of about 20 diffraction angles and their integral maximum breadths had a linear relation to the shock pressures, in which the elastic limit could not be detected. Unit cell dimensions did not show any changes against the shock pressures, however the increasing broadening of X-ray diffraction peaks occurred with the increase of shock pressures, indicating the homogeneous lattice distortion due to shock pressures. This is the first quantitative analysis that enables us to estimate an experienced shock pressure from the X-ray peak broadening, and is applied to the Dhurmsala LL6 chondrite; the pressure estimated in this study is ranging from 24.0 to 37.8GPa in contrast to the range of 5 to 20 GPa (shock stage S3 by Stöffler et al., 1991) estimated from the texture of olivine in the chondrite.
314 Chemical composition of glassy spherules separated from deposit in water tank of the dome F station, Antarctica : A report of preliminary investigation for Antarctic cosmic-dust

Fukuoka T., Tazawa Y., Nakamura T., Imae N., Noguchi T., Yano H., Nakai I., Terada K., Nogami K., Ohashi H., Murakami T.

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　1998　98-98　1998/10/13
Publisher: The Japanese Society for Planetary Sciences
Preliminary examination and curation of comic dust collected at the Antarctic Dome-Fiji base.

中村智樹, 今栄直也, 中井泉, 野口高明, 矢野創, 寺田健太郎, 村上登志男, 野上謙一, 大橋英雄

地球惑星科学関連学会合同大会予稿集　1998　271　1998/05
Oxygen is otope study of Tsukuba chondrite, some HED meteorites and Allende chondrules.

Antarctic Meteorite Research　11　122-136　1998
Collection and Curation of Cosmic Dust

YANO Hajime, NAKAMURA Tomoki, NOZAKI Wataru, FUNAKI Minoru, IMAE Naoya, NOGAMI Ken-ichi

Chikyukagaku　32　(4)　161-174　1998
Publisher: The Geochemical Society of Japan
DOI： 10.14934/chikyukagaku.32.161 　

ISSN： 0386-4073

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Since the early development of the cosmic dust research that started almost a century ago, a wide variety of the sample collection techniques has been developed. Such direct sampling of cosmic dust (or micrometeoroids, micrometeorites, interplanetary dust particles (IDP)) has enabled subsequent analyses of these extra-terrestrial micro particles at ground laboratories in great detail. In coming years, Japan will have an array of new opportunities of cosmic dust collection from space, stratosphere and Antarctica. However each collection site causes certain biases of samples in terms of physical and chemical alterations, selection effects and contamination. Here we review the cosmic dust collection from deep sea sediments, Greenland blue lakes, Antarctic ice cores, stratosphere and both near-Earth and interplanetary space, together with a brief description of the curation system of the samples being operated by NASA/JSC.
A Bridge over the Border -Malaysia-Singapore Second Crossing-

NAKAMURA Tomoki

82　(11)　2-5　1997/11/15
Publisher: 土木学会
ISSN： 0021-468X
204 LOSS OF PRIMORDIAL NOBLE GASES FROM PRIMITIVE CHONDRITIC METEORITES BY IMPACTS

Nakamura T., Zolensky M. E., Horz F., Takaoka N., Nagao K.

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　1997　26-26　1997/09/15
Publisher: The Japanese Society for Planetary Sciences
102 Studies on noble gases in estatite chondrites

Okazaki R., Takaoka N., Nakamura T., Nagao K.

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　1997　16-16　1997/09/15
Publisher: The Japanese Society for Planetary Sciences
104 The Parent Body of Thermally Heated Unusual CM Carbonaceous Chondrites

Matsuoka K., Nakamura T., Takaoka N., Nagao K., Nakamuta Y.

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　1997　18-18　1997/09/15
Publisher: The Japanese Society for Planetary Sciences
Shock effects on phase Q and HL diamonds inferred from experimentally shock loading on Allende meteorite.

Lunar Planetary Science Conference　28　1416-1417　1997
Noble gases and mineralogy of primary igneous materials of the Yamato 793605 shergottite.

Nagao Keisuke, Nakamura Tomoki, Miura Yayoi N., Takaoka Nobuo

Antarctic Meteorite Research　10　125-142　1997
101 The information on precursors of melted cosmic dust

Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　1996　15-15　1996/10/02
Publisher: The Japanese Society for Planetary Sciences
Yamato-86789 : A heated CM-like carbonaceous chondrite.

MATSUOKA K.

Proceedings of the NIPR Symposium on Antarctic Meteorites.　9　20-36　1996
Noble gas analysis of the Julesburg L3.6, Tulia H4, Y-86789 thermally metamorphosed CM and Allende CV3 chondrites by crushing method.

Lunar and Planetary Science Conference　27　385　1996
Shock effects on the most primitive planetary bodies interred from natural and experimentally shocked carbonaceous chondrites.

Proceedings for the 3rd NIRIM International Symposium on Advanced Materials　25　1996
Formation processes of magnetic spherules collected from deep-sea sediments -Observation and numerical simulations of the orbital evolution.

YADA T.

Proceedings of the NIPR Symposium on Antarctic Meteorites　9　218-236　1996
X-ray Study of PCP from the Murchison CM carbonaceous chondrites.

Proceedings of the NIPR Symposium on Antarctic Meteorites　9　37　1996
Numerical Simulation of I-type spherule formation

Lunar and Planetary Science Conference　27　1463　1996
Noble-gas distribution in the Murchison, Murray, Nogoya and Yamato-791198

Lunar and Planetary Science Conference　27　929　1996
Noble gases released by crushing from Happy Canyon E-chondrite.

Lunar and Planetary Science Conference　27　1307　1996
IMPACT-INDUCED CHONDRULE FLATTENING IN THE ALLENDE CV3 CARBONACEOUS CHONDRITE - SHOCK EXPERIMENTS

T NAKAMURA, K TOMEOKA, T SEKINE, H TAKEDA

METEORITICS　30　(3)　344-347　1995/05

ISSN： 0026-1114
Gravitational instabilities in a dust layer and the condition for the compound chondrules

Proceedings of the 28th ISAS Lunar and Planetary Symposium　73　1995
Primordial noble gas-rich component in the CM chondrites : implications for the site of phase Q

Lunar and planetary science conference　26　1027　1995
始源隕石炭素質コンドライトの衝撃変成

月刊地球　12　71　1995
Shock metamorphism of carbonaceous chondrites.

12　71　1995
原始太陽系内のダストの振る舞い

遊星人(日本惑星科学会誌)　4　248　1995
SHOCK EFFECTS OF CK CHONDRITES INFERRED FROM HIGH-TEMPERATURE SHOCK EXPERIMENTS ON ALLENDE

T NAKAMURA, K TOMEOKA, T SEKINE, H TAKEDA

METEORITICS　29　(4)　509-510　1994/07

ISSN： 0026-1114
High-temperature shock effects on carbonaceous chondrites

Lunar and planetary science conference　26　969　1994
Analysis of trace ruthenium in meteoritic FeNi minerals by microbeam XRF using synchrotron radiation

Jun SAITO, Tomoki NAKAMURA, Akira YAMAGUCHI, Kazuto SAIKI, Hiroshi TAKEDA

Mineralogical Journal　16　(5)　258-267　1993

DOI： 10.2465/minerj.16.258 　

ISSN： 0544-2540 1881-4174
Mineralogy and petrology of the CK chondrites Yamato-82104, Yamato-693 and a Carlisle Lakes-type chondrite Yamato-82002

Proceedings of the NIPR Symposium on Antarctic Meteorites.　6,171　1993
Shock metamorphism of carbonaceous chondrites : textural diversity of experimentally shocked Allende in various conditions.

Meteoritics　28　(3)　408　1993
SHOCK EFFECTS OF THE LEOVILLE CV CARBONACEOUS CHONDRITE - A TRANSMISSION ELECTRON-MICROSCOPE STUDY

T NAKAMURA, K TOMEOKA, H TAKEDA

EARTH AND PLANETARY SCIENCE LETTERS　114　(1)　159-170　1992/12

DOI： 10.1016/0012-821X(92)90158-R 　

ISSN： 0012-821X
SHOCK-INDUCED DEFORMATION RECORDED IN THE LEOVILLE CV CARBONACEOUS CHONDRITE

T NAKAMURA, K TOMEOKA, H TAKEDA

METEORITICS　26　(4)　377-377　1991/12

ISSN： 0026-1114
Okudaira K., Noguchi T., Nakamura T., Sugita S., Sekine Y., and Yano H. (2004) Evaluation of mineralogical alteration of micrometeoroid analog materials captured in aerogel.

Advanced Space Science, 34, 2299-2304.
Yada T., Nakamura T., Takaoka N., Noguchi T., Terada K., Yano Y., Nakazawa T., and Kojima H. (2004) The global accretion rate of extraterrestrial materials in the last glacial period estimated from the abundance of micrometeorites in Antarctic glacier ・・・

Earth Planets and Space, 56, 67-79.

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Yada T., Nakamura T., Takaoka N., Noguchi T., Terada K., Yano Y., Nakazawa T., and Kojima H. (2004) The global accretion rate of extraterrestrial materials in the last glacial period estimated from the abundance of micrometeorites in Antarctic glacier ice.
Kusakabe M., Maruyama S., Nakamura T., and Yada T. (2004) An oxygen isotope analytical system for rocks and minerals using a CO2 Laser-BrF5 fluorination Technique.

Journal of the Mass Spectrometry Society of Japan, 52, 205-212.

DOI： 10.5702/massspec.52.205 　
Condition for the formation of the compound chondrules in the solar nebula.

Proceedings of the NIPR symposium on Antarctic Meteorites　9　208

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Presentations 218

Possible Interpretations of Visible/Near-Infrared Spectra of Asteroid Ryugu Obtained by the Hayabusa2 Mission International-presentation

Nakamura, T, Matsuoka, M, Amano, K, Kobayashi, S, Mita, H, Brunetto, R, Lantz, C, Hiroi, T, Zolensky, M, Kitazato, K, Sugita, S, Honda, R, Morota, T, Tatsumi, E, Milliken, R, Iwata, T, Kameda, S, Sawada, H, Abe, M, Ohtake, M, Matsuura, S, Arai1, T, Nakauchi, Y, Mogi, K, Yamashita, S, Sato, Y, Ka, H, Honda, C, Yokota, Y, Yamada, M, Kouyama, T, Sakatani, N, Senshu, H, Hirata, N, Suzuki, H, Yoshioka, K, Hayakawa, M, Cho, Y, Pilorget, C, Poulet, F, Riu, L, Bibring, J, Takir, D, Domingue, D, Vilas, F, Barucci, M, Perna, D, Palomba, E, Galiano, A, Tsumura, K, Osawa, T, Komatsu, M, Nakato, A, Arai, T, Takato, N, Matsunaga, T, Imae, N, Yamaguchi, A, Kojima H, Nakazawa, S, Tanaka, S, Yoshikawa, M, Watanabe, S, Tsuda, Y

50th Lunar and Planetary Science Conference　2019/03/18
Solar-radiation Heating as a Possible Heat Source for Dehydration of Hydrous Primitive Asteroids International-presentation

Nakamura, T, Golabek, G, Ohtsuka, K, Matsuoka, M

Int'l Symposium on Dust & Parent Bodies 2019　2019/02/12
Project overview of CAESAR comet sample return mission International-presentation

Nakamura, T, Squyres, S, Nakamura, K, Furukawa, Y, Kimura, Y, Takigawa, A, Lauretta, D, Messenger, S, CAESAR project team

Hayabusa Symposium 2018　2018/12/06
History of unsuccessful reproduction experiments (including me!) of barred olivine chondrules International-presentation

NAKAMURA Tomoki

Core2 meeting　2018/06
The First Recovery of Asteroidal Samples to the Earth and Subsequent Two Japanese Sample Return Missions: Hayabusa, Hayabusa2, and MMX Missions International-presentation

NAKAMURA Tomoki

Astrophysics Colloquium　2018/06
Japanese Second Sample Return Mission: Hayabusa2 International-presentation Invited

NAKAMURA Tomoki

Asteroid Science Intersections with In-Space Mine Engineering　2018/04/16
Physical and Chemical Properties of Phobos and Deimos in a Giant Impact Hypothesis

R. H. Hyodo, H. G. Genda, S. C. Charnoz, F. P. Pignatale, P. R. Rosenblatt, T. N. Nakamura

49th Lunar and Planetary Science Conference (2018)　2018/03
Gaussian Deconvolution of the 3-Micron Hydration Band of Carbonaceous Chondrites for Identifying Their Parent Bodies Using a Spectrometer in Space

T. Hiroi, R. E. Milliken, H. Kaiden, S. Sasaki, M. Matsuoka, T. Nakamura

49th Lunar and Planetary Science Conference (2018)　2018/03
Diversity of Soluble Organic Matter in Antarctic Micrometeorites, Considering in Relation to Chondrites

K. Yamamoto, M. Hashiguchi, T. Yada, H. Naraoka, T. Nakamura, T. Okada

49th Lunar and Planetary Science Conference (2018)　2018/03
Martian Moons Exploration (MMX) Conceptual Study Update

K. Kuramoto, Y. Kawakatsu, M. Fujimoto, H. Genda, T. Imamura, S. Kameda, K. Matsumoto, H. Miyamoto, T. Morota, H. Nagaoka, T. Nakamura, K. Ogawa, H. Otake, M. Ozaki, S. Sasaki, H. Senshu, S. Tachibana, N. Terada, T. Usui, K. Wada, S. Watababe, MMX Study Team

49th Lunar and Planetary Science Conference (2018)　2018/03
Hayabusa2 Landing Site Selection (LSS) Training: Summary Report of Scientific Evaluation

H. Yabuta, N. Hirata, R. Honda, Y. Ishihara, K. Kitazato, M. Komatsu, A. Miura, K. Matsumoto, T. Morota, T. Nakamura, A. Nakato, T. Noguchi, T. Okada, N. Sakatani, S. Sugita, S. Tachibana, S. Tanaka, E. Tatsumi, S. Watanabe, T. Yamaguchi, Y. Yamamoto, Hayabusa, LSSAA Team

49th Lunar and Planetary Science Conference (2018)　2018/03
The CAESAR New Frontiers Mission: 3. TAG Site Selection and Camera Suite

A. G. Hayes, K. M. Getzandanner, J. M. Soderblom, M. Ravine, R. Kirk, J. Tansock, M. B. Houghton, D. P. Glavin, S. P. D. Birch, K. Nakamura-Messenger, K. E. Berry, D. D. Rowlands, E. Mazarico, E. E. Palmer, R. W. Gaskell, S. W. Squyres, CAESAR Project Team

49th Lunar and Planetary Science Conference (2018)　2018/03
DESTINY+ Mission: Flyby of Geminids Parent Asteroid (3200) Phaethon and In-Situ Analyses of Dust Accreting on the Earth

T. Arai, M. Kobayashi, K. Ishibashi, F. Yoshida, H. Kimura, K. Wada, H. Senshu, M. Yamada, O. Okudaira, T. Okamoto, S. Kameda, R. Srama, H. Kruger, M. Ishiguro, H. Yabuta, T. Nakamura, J. Watanabe, T. Ito, K. Ohtsuka, S. Tachibana, T. Mikouchi, M. Komatsu, K. Nakamura-Messenger, S. Sasaki, T. Hiroi, S. Abe, S. Urakawa, N. Hirata, H. Demura, G. Komatsu, T. Noguchi, T. Sekiguchi, T. Inamori, H. Yano, M. Yoshikawa, T. Ohtsubo, T. Okada, T. Iwata, K. Nishiyama, T

49th Lunar and Planetary Science Conference (2018)　2018/03
The CAESAR New Frontiers Mission: 5. Contamination, Recovery, and Curation

K. Nakamura-Messenger, L. Berm?dez, J. S. Canham, P. C. Chu, S. J. Clemett, J. P. Dworkin, P. A. Gerakines, C. D. K. Herd, M. B. Houghton, D. S. Lauretta, C. C. Lorentson, J. M. Makowski, S. R. Messenger, S. N. Milam, T. Nakamura, D. Oberg, L. F. Pace, J. W. Spring, M. Violet, K. Zacny, T. J. Zega, S. W. Squyres, CAESAR Project Team

49th Lunar and Planetary Science Conference (2018)　2018/03
The CAESAR New Frontiers Mission: 4. Sample Acquisition and Preservation

D. P. Glavin, S. W. Squyres, P. C. Chu, P. A. Gerakines, K. Yamada, J. E. Parker, H. L. Peabody, M. B. Houghton, S. Aslam, N. Gorius, G. Quilligan, J. Spring, K. A. Zacny, S. Gorevan, S. Okazaki, Y. Satoh, Y. Maru, T. Nakao, A. Kukita, T. Shimoda, T. Yamakawi, A. G. Hayes, D. S. Lauretta, S. Messenger, K. Nakamura-Messenger, T. Nakamura, J. P. Dworkin, S. J. Clemett, Y. Furukawa, Y. Kimura, A. Takigawa, CAESAR Project Team

49th Lunar and Planetary Science Conference (2018)　2018/03
Phobos Environment Model and Regolith Simulant for MMX Mission

H. Miyamoto, T. Niihara, K. Wada, K. Ogawa, N. Baresi, P. Abell, E. Asphaug, D. Britt, G. Dodbiba, T. Fujita, K. Fukui, M. Grott, K. Hashiba, R. Hemmi, P. Hong, T. Imada, H. Kikuchi, P. Mitchel, K. Mogi, T. Nakamura

49th Lunar and Planetary Science Conference (2018)　2018/03
The CAESAR New Frontiers Mission: 2. Sample Science

D. S. Lauretta, S. W. Squyres, S. Messenger, K. Nakamura-Messenger, T. Nakamura, D. P. Glavin, J. P. Dworkin, A. Nguyen, S. Clemett, Y. Furukawa, Y. Kimura, A. Takigawa, G. Blake, T. J. Zega, M. Mumma, S. Milam, C. D. K. Herd, CAESAR Project Team

49th Lunar and Planetary Science Conference (2018)　2018/03
MMX overview International-presentation

Tomoki Nakamura

Small Bodies Assessment Group 18th Meeting　2018/01/17
Dehydration process of experimentally heated Tagish Lake carbonaceous chondrite without any effects of rehydrated and adsorbed water

K. Mogi, S. Yamashita, T. Nakamura, M. Matsuoka, S. Okumura, Y. Furukawa

2017 Joint meeting of Multi-scale asteroid science & Aqua planetology　2017/12
The effects of rehydrated and adsorbed water in naturally and experimentally dehydrated carbonaceous chondrites

Sayuri Yamashita, Kaoru Mogi, Tomoki Nakamura, MoeMatsuoka, Queenie Chan, Yuma Enokido, Yudai Sato, Satoshi Okumura, Yoshihiro Furukawa, Mike Zolensky

2017 Joint meeting of Multi-scale asteroid science & Aqua planetology　2017/12
Spectral and mineralogical properties of dehydrated carbonaceous chondrites, The Eighth Symposium on Polar Science

M. Matsuoka, T. Nakamura, N. Miyajima, N. Imae, A. Yamaguchi, H. Kojima

The Eighth Symposium on Polar Science　2017/12
Yamato-980115: CI chondrite experienced incomplete dehydration deduced from mineralogy and noble gas signatures

Kazuki Kikuchi, Tomoki Nakamura, Daisuke Nakashima, Keisuke Nagao, Naoya Imae, Akira Yamaguchi

The Eighth Symposium on Polar Science　2017/12
Current status of consortium study of silica-containing Hayabusa-returned particle

M. Hashiguchi, A. Miyake, A. Tsuchiyama, T. Nakamura, M. Uesugi, J. Matsuno, A. Nakato, T. Yada, M.Yoshitake, T. Okada, M. Abe, H. Yurimoto

2017 Hayabusa symposium　2017/12
Near infrared spectral imager MacrOmega onboard MMX to investigate martian atmosphere

Hiromu Nakagawa, Shohei Aoki, Takeshi Imamura, Kazunori Ogohara, Takao M. Sato, Hideo Sagawa, Takeshi Sakanoi, Yasumasa Kasaba, Makoto Taguchi, Takahiro Iwata, Tomoki Nakamura, Vincent Hamm, Cedric Pilorget, Jean-Peire Bibring

SGEPSS Fall Meeting in Kyoto 2017　2017/10
天然および実験的に加熱脱水した炭素質コンドライト隕石に対する復水と吸着水の影響

中村智樹, 茂木郁, 山下小百合, 松岡萌, 榎戸祐馬, 佐藤勇大, 奥村聡, 古川喜博

日本鉱物科学会2017　2017/09
Mineralogy and crystallography of return samples from primitive asteroids International-presentation Invited

Tomoki Nakamura

24 Congress and General Assembly of the International Union of Crystallography　2017/08/27
Development of a Near-Infrared Hyper-Spectral Imaging Camera NIRS44/MacrOmega for the Martian Moon's Sample Return Mission

Takeshi Sakanoi, Hiromu Nakagawa, Takahiro Iwata, Tomoki Nakamura, Jean-Pierre Bibring, Cedric Pilorget, Vincent Hamm, Yasumasa Kasaba, Takeshi Imamura, Shohei Aoki, Takao M. Sato, Makoto Taguchi, Atsushi Yamazaki

14th Annual Meeting Asia Oceania Geosciences Society　2017/08
SOLAR-RADIATION HEATING AS A POSSIBLE HEAT SOURCE FOR DEHYDRATION OF HYDROUS CARBONACEOUS CHONDRITES International-presentation

Tomoki Nakamura, Gregor Golabek, Katsuhito Ohtsuka, Moe Matsuoka

80th Annual Meeting of The Meteoritical Society　2017/07/23
Development of near- infrared spectrometers NIRS4/MacrOmega for the Martian moon’s sample return mission MMX

Takeshi Sakanoi, Takahiro Iwata, Hiromu Nakagawa, Jean-Pierre Bibring, Vincent Hamm, Cedric Pilorget, Tomoki Nakamura, Shohei Aoki, Takao M. Sato, Yasumasa Kasaba

31st International Symposium on Space Technology and Science　2017/07
ORIGIN OF SPINEL FRAMBOIDS IN CALCIUM-ALUMINUM-RICH INCLUSIONS

T. Yoshizaki, D. Nakashima, T. Nakamura, N. Sakamoto, H. Ishida

80th Annual Meeting of The Meteoritical Society　2017/07
DEHYDRATION PROCESS OF EXPERIMENTALLY HEATED MURCHISON WITHOUT ANY EFFECTS OF ADSORBED AND REHYDRATED WATER

Kaoru Mogi, Sayuri Yamashita, Tomoki Nakamura, Moe Matsuoka, Satoshi Okumura, Yoshihiro Furukawa

80th Annual Meeting of The Meteoritical Society　2017/07
DISCOVERY OF RUBINITE, Ca 3 Ti 3+ 2 Si 3 O 12 , A NEW GARNET MINERAL IN REFRACTORY INCLUSIONS FROM CARBONACEOUS CHONDRITES

Chi Ma, Takashi Yoshizaki, Alexander N. Krot, John R. Beckett, Tomoki Nakamura, Kazuhide Nagashima, Jun Muto, Marina A. Ivanova

80th Annual Meeting of The Meteoritical Society　2017/07
Hayabusa mission: A current summary of return sample analysis Invited

2017/05/20
始原天体の太陽加熱の観点から

中村智樹

第19回CPS 月惑星探査研究会　2017/05
Hydration and dehydration of primitive asteroids as inferred from mineralogical and compositional properties of carbonaceous chondrites International-presentation

NAKAMURA Tomoki

JSPS Core-to-Core program “Planet 2” symposium　2017/02/20
Mineralogy and mineral chemistry of a newly identified shock-melted Itokawa particle RB-CV-0082 International-presentation

Nakamura, T, Jourdan, F, Kishi, Y, Oike, R, Timms N, Bland P

2016 Hayabusa symposium　2016/11/29
Remote sensing and return sample analysis of MMX mission International-presentation

NAKAMURA Tomoki

Martian Moons eXploration (MMX) science meeting (First F2F MMX CNES/JAXA/IAS meeting)　2016/11/07
Mineralogical and compositional analysis of Itokawa dust particles returned by the Hayabusa mission International-presentation

NAKAMURA Tomoki

ISSI Workshop on Cosmic Dust from the Lab to the Stars　2016/10/31
火星衛星の反射スペクトルに基づく物質推定：含水炭素質隕石の加熱実験生成物との比較

中村智樹, 茂木郁, 山下小百合, 松岡萌, 佐藤勇大, 古川善博, 奥村聡, 中嶋大輔

日本鉱物科学会2016　2016/09/23
ＭＭＸリモートセンシングによるフォボス分光観測と物質分布推定

中村智樹, 亀田真吾, 宮本英昭, 長谷部信行, 岡田達明, ロッシュ、テッド, MMX衛星リモセンコンソーシアム

日本惑星科学会2016　2016/09/12
Experimental heating of Murray CM carbonaceous chondrite at 800℃ in the presence of water International-presentation

Nakamura, T, Mibe, K, Shimojuku, A, Nakato, A, Oike, R, Noguchi, T

79th Annual Meeting of the Meteoritical Society　2016/08/07
Observation Plans for Hydrated Minerals and Carbonaceous Materials on Phobos and Deimos by Near-Infrared Hyperspectral Imager Macromega

Takahiro Iwata, Tomoki Nakamura, Jean-Pierre Bibring, Vincent Hamm, Cedric Pilorget, Takeshi Sakanoi, Hiromu Nakagawa, Sarah Crites

14th Annual Meeting Asia Oceania Geosciences Society　2016/08
Chondrule Flattening of MET01072 CM Chondrite: Possible Evidence for Long-Duration Slow Impact International-presentation

Nakamura, T, Matsuoka, M, Yamashita, S, Sato, Y, Nakato, A, Uesugi, M, Miyahara, M, Uesugi, K

26th Goldschmidt 2016　2016/06/26
CI、CMコンドライト隕石の鉱物学および希ガス同位体組成に基づく含水小惑星の脱水過程の解明

菊池知紀, 中村智樹, 中嶋大輔, 長尾敬介, 今栄直也, 山口亮, 小島秀康

日本地球惑星科学連合大会2016　2016/05/22
実験的に加熱したTagish Lake隕石の反射スペクトル、鉱物学、化学組成

茂木郁, 中村智樹, 山下小百合, 松岡萌, 佐藤勇大, 古川善博, 奥村聡, 中嶋大輔

日本地球惑星科学連合大会2016　2016/05/22
Tagish Lake隕石の加熱実験: 加熱脱水炭素質コンドライトの熱進化過程の研究

中藤亜衣子, 中村智樹, 癸生川陽子, 武一泰男, 菅大暉, 宮本千尋, 間瀬一彦, 高橋嘉夫

日本地球惑星科学連合大会2016　2016/05/22
Meteorites and mineral textures in meteorites International-presentation

NAKAMURA Tomoki

Crystallography for Space Sciences　2016/04/16
Oxygen Isotope Ratios of Chondrules and Isolated Forsterite and Olivine Grains in the WIS91600 Carbonaceous Chondrite from D-Type Asteroid International-presentation

Yamanobe M, Nakamura T, Nakashima D

47th Lunar and Planetary Science Conference　2016/03/21
Estimating the Carbon Contents and Distinguishing the Types of Carbonaceous Chondrites by Spectral Instruments Onboard Hayabusa2 Spacecraft International-presentation

Hiroi T, Kaiden H, Imae N, Yamaguchi A, Kojima H, Sasaki S, Matsuoka M, Nakamura T, Carlé M. Pieters

47th Lunar and Planetary Science Conference　2016/03/21
Reproducing Space Weathering on C-Type Asteroids with Low-Energy Laser Irradiation Experiments of the Murchison Meteorite International-presentation

Matsuoka M, Nakamura T, Kimura Y, Hiroi T, Nakamura R, Okumura S, Sasaki S

47th Lunar and Planetary Science Conference　2016/03/21
火星衛星の構成物に関する観測的制約と今後の課題

宮本英昭, 中村智樹, 亀田真吾, 松本晃治, 菊地紘, 新原隆史, 長勇一郎, 洪鵬, 火星衛星サンプルリターン科学検討チーム

日本惑星科学会2015秋季講演会　2015/10/14
浮遊法を用いた再現実験によるコンドリュール形成環境の検討

野村逸郎, 中村智樹, 木村勇気, 塚本勝男, 三浦均, 上椙真之, 上杉健太朗, 星野真人

日本鉱物学会年会2015　2015/09/25
炭素質隕石の反射スペクトルの鉱物学的評価：C型小惑星の水質変成の特性化を目指して

佐藤勇大, 中村智樹, 仲田愛里, 松岡萌

日本鉱物学会年会2015　2015/09/25
Reflectance Spectra Measurement of Various Carbonaceous Chondrites Using Hayabusa-2 Near Infrared Spectrometer International-presentation

Nakamura T, Iwata T, Kitasato K, Abe M, Osawa T, Matsuoka M, Nakauchi Y, Arai T, Komatsu M, Hiroi T, Imae N, Yamaguchi A, Kojima H

78th Annual Meeting of the METEORITICAL SOCIETY　2015/07/27
Depletion of Volatiles and Timing of Heating Recorded in Thermally Metamorphosed Hydrous Carbonaceous Chondrites International-presentation

Nakamura T, Park J, Ahn I. S, Shirai N, Sekimoto S, Nakato A, Nakashima D, Turrin B. D, Lindsay F. N, Herzog G. F, Delaney J. S, Swisher C. C. III, Nagao K

78th Annual Meeting of the METEORITICAL SOCIETY　2015/07/27
Progressive Changes in Mineralogy, Reflectance Spectra and Water Contents of Experimentally Heated Murchison at 400, 600, and 900°C International-presentation

Yamashita S, Nakamura T, Jogo K, Matsuoka M, Okumura S

78th Annual Meeting of the METEORITICAL SOCIETY　2015/07/27
Application of Antarctic Meteorites to Grand Performance Test of the Near Infrared Spectrometer on Board the Hayabusa 2 Spacecraft International-presentation

Nakamura T, Iwata T, Kitasato K, Abe M, Osawa T, Matsuoka M, Nakauchi Y, Arai T, Komatsu M, Hiroi T, Imae N, Yamaguchi A, Kojima H

XII International Symposium on Antarctic Earth Science　2015/07/13
The collection and studies of Antarctic micrometeorites from Japanese Antarctic Research Expedition International-presentation

Imae N, Noguchi T, Kojima H, Nakamura T, Yada T, Iwata N, Terada K

XII International Symposium on Antarctic Earth Science　2015/07/13
含水炭素質コンドライトの脱水および復水過程

中村智樹, 松岡萌, 山下小百合, 佐藤勇大, 城後香里, アンインスー, リジョンイク, 今栄直也, 山口亮, 小島秀康

日本地球惑星科学連合大会　2015/05/24
浮遊法による放射状輝石コンドリュールの組織再現実験

野村逸郎, 中村智樹, 木村勇気, 塚本勝男, 三浦均, 上椙真之, 上杉健太朗, 星野真人

日本地球惑星科学連合大会　2015/05/24
炭素質隕石の反射スペクトルによるC型小惑星の水質変成の特性化

佐藤勇大, 中村智樹, 仲田愛里, 松岡萌

日本地球惑星科学連合大会　2015/05/24
Mineralogy of Itokawa Dust Particles with Possible Shock-Induced Melting International-presentation

Nakamura T, Noguchi T, Tsuchiyama A, Kimura M, Zolensky M.E, Tanaka M, Tazawa K, Uesugi M, Nakato A, Yada T, Okazaki R, Shirai K, Ishibashi Y, Karouji Y, Abe M, Okada T, Fujimura A

HAYABUSA2014:Symposium of Solar System Materials　2014/12/04
Surface Morphologies and Their Origins of ITOKAWA Regolith Particles

Tsuchiyama A, Matsumoto T, Nakamura T, Nakamura M, Uesugi K, NakanoT

HAYABUSA2014:Symposium of Solar System Materials　2014/12/04
Reflectance spectra measurement of hydrated and dehydrated carbonaceous chondrites using the Near Infrared Spectrometer on Hayabusa 2 spacecraft

Nakamura T, Iwata T, Kitasato K, Abe M, Osawa T, Matsuoka M, Nakauchi Y, Arai T, Komatsu M, Hiroi T, Imae N, Yamaguchi A, Kojima H

第5回極域科学シンポジウム　2014/12/02
Discovery of Unusual 3 μm Bands on Some CM Chondrite Chips of NIPR and Possible Link to Asteroidal Surface Minerals

Hiroi T, Kaiden H, Imae N, Yamaguchi A, Kojima H, Sasaki S, Matsuoka M, Nakamura T, Pieters C. M

第5回極域科学シンポジウム　2014/12/02
Sub-kmサイズ地球近傍小惑星2011 XA3の高速自転II

浦川聖太郎, 大塚勝仁, 阿部新助, 伊藤孝士, 中村智樹

日本惑星科学会秋季講演会2014　2014/09/24
はやぶさ２近赤外分光計による含水および脱水炭素質隕石の反射スペクトル測定

中村智樹, 岩田隆浩, 北里宏平, 安部正真, 大澤崇人, 松岡萌, 仲内悠祐, 荒井武彦, 小松睦美, 廣井孝弘, 今栄直也, 山口亮, 小島秀康

日本惑星科学会秋季講演会2014　2014/09/24
The Unique Differentiated Meteorite NWA7325: Highly Reduced, Stark Affinities to E-Chondrites and Unknown Pasrental Planet International-presentation

El Goresy A, Nakamura T, Miyahara M, Ohtani E, Ph. Gil-let, Jogo K, Yamanobe M, Ishida H

77th Annual Meeting of the Meteoritical Society　2014/09/08
Surface Micromorphologies of Regolith Particles from Asteroid Itokawa and Its Implicaition to Space Weathering International-presentation

Matsumoto T, Tsuchiyama A, Miyake A, Noguchi T, Nakamura T, Nakamura M, Matsuno J, Shimada A, Uesugi K, Nakano T

77th Annual Meeting of the Meteoritical Society　2014/09/08
Performances of Flight Model of NIRS3: the Near Infrared Spectrometer on Hayabusa-2 International-presentation

Iwata T, Kitazato K, Abe M, Arai T, Nakauchi Y, Nakamura T, Hiroi T, Matsuoka M, Matsuura S, Ozaki M, Watanabe S, nd NIRS, Mission Group

AOGS 11th Annual Meeting（Asia Oceania Geosciences Society）　2014/07/28
Thermal history of the parent bodies of asteroid Itokawa International-presentation

Wakita S, Nakamura T, Ikeda T, Yurimoto H

AOGS 11th Annual Meeting（Asia Oceania Geosciences Society）　2014/07/28
Relationship of organics, minerals, and water in ice-rock small body recorded in an ultracarbonaceous Antarctic micrometeorite International-presentation

Yabuta H, Noguch T, Itoh S, Nakamura T, Tsujimoto S, Sakamoto N, Hashiguchi M, Abe K, David Kilcoyne A. L, Okubo A, Tachibana S, Okazaki R, Terada K, Ebihara M, Nagahara H

Origins 2014 International Conference　2014/07/06
Fast Rotation of Near-Earth Object 2011 XA3 International-presentation

Urakawa S, Ohtsuka K, Abe S, Ito T, Nakamura T

Asteroids, Comets, Meteors 2014　2014/06/30
Thermal history of the parent bodies of asteroid Itokawa International-presentation

Wakita S, Nakamura T, Ikeda T, Yurimoto H

Asteroids, Comets, Meteors 2014　2014/06/30
Thermal History of the Parent Asteroid of Itokawa International-presentation

Nakamura T, Wakita S

Goldschmidt2014　2014/06/08
Reproduction of Space Weathering of C-Type Asteroids by Laser Heating Experiments of Murchison CM2 Chondrite International-presentation

Matsuoka M, Nakamura T, Kimura Y, Hiroi T, Nakamura R, Okumura S, Sasaki S

Goldschmidt2014　2014/06/08
小惑星イトカワから回収したレゴリス粒子の表面微細構造観察

松本徹, 土山明, 三宅亮, 野口高明, 中村智樹, 中村美千彦, 松野淳也, 島田玲, 上杉健太郎, 中野司

日本顕微鏡学会　2014/05/11
はやぶさ２搭載近赤外分光計 NIRS3 のフライトモデル性能

岩田隆浩, 北里宏平, 安部正真, 荒井武彦, 仲内悠祐, 中村智樹, 廣井孝弘, 松岡萌, 松浦周二, 尾崎正伸, 渡邊誠一郎

日本地球惑星科学連合連合大会 2014年大会　2014/04/28
ISS/JEM 曝露部利用実験たんぽぽ：宇宙塵捕集計画と地上実験

薮田ひかる, 緒方雄一朗, 奥平恭子, 小林憲正, 三田肇, 中嶋悟, 脇太郎, 池本夕佳, 長谷川直, 田端誠, 横堀伸一, 今井栄一, 河口優子, 杉野朋弘, 浜瀬健司, 福島和彦, 青木弾, 野口高明, 土山明, 中村智樹, 伊藤元雄, 三河内岳, 矢野創, 山岸明彦, たんぽぽワーキンググループ

日本地球惑星科学連合連合大会 2014年大会　2014/04/28
電子線ホログラフィーによるフランボイダルマグネタイトの磁場構造と生成過程の解明

木村勇気, 佐藤岳志, 中村智樹, 中村教博, 野澤純, 塚本勝男, 山本和生

日本地球惑星科学連合連合大会 2014年大会　2014/04/28
イトカワレゴリス粒子の３次元構造：月レゴリス粒子との比較

土山明, 松島亘志, 松本徹, 中野司, 松淳也, 島田玲, 上杉健太朗, 竹内晃久, 鈴木芳生, 大竹真紀子, 中村智樹, 上椙真之, 矢田達, 西泉邦彦

日本地球惑星科学連合連合大会 2014年大会　2014/04/28
小惑星イトカワのレゴリス粒子の表面微細構造から考察するレゴリスの宇宙風化過程

松本徹, 土山明, 三宅亮, 野口高明, 中村智樹, 中村美千彦, 松野淳也, 島田玲, 上杉健太朗, 中野司

日本地球惑星科学連合連合大会 2014年大会　2014/04/28
Oxygen Isotopic Compositions of Chondrules from the Primitive CV3 Chondrite RBT 04143.

H. Ishida, S. Itoh, H. Yurimoto, T. Nakamura

45th Lunar and Planetary Science Conference　2014/03/17
Results of Ground Performance Tests for NIRS3: the Never Infrared Spectrometer on Hayabusa-2.

T. Iwata, K. Kitazato, M. Abe, T. Arai, Y. Nakauchi, T. Nakamura, T. Hiroi, S. Matsuura, M. Ozaki, S. Watanabe

45th Lunar and Planetary Science Conference　2014/03/17
Visible and Near-Infrared Spectral Survey of CM Chondrite Samples of National Institute of Polar Research and Possible Discovery of Unusual 3-Micron Absorption Bands.

T. Hiroi, H. Kaiden, N. Imae, A. Yamaguchi, H. Kojima, S. Sasaki, T. Misu, M. Matsuoka, T. Nakamura, Carlé M. Pieters

45th Lunar and Planetary Science Conference　2014/03/17
CVコンドライト及びCRコンドライトの水質変成について

小松睦美, 三河内岳, 荒井朋子, 中村智樹, 廣井孝弘, 北里宏平

日本惑星科学会　2013/11/20
Pulse-laser irradiation experiments of Murchison CM2 chondrite forreproduction of space weathering of C-type asteroids

Moe Matsuoka, Tomoki Nakamura, YukiKimura, Takahiro Hiroi, Takaaki Misu, Ryosuke Nakamura, Satoshi Okumura, Sho Sasaki

2013年度第4回極域科学シンポジウム　2013/11/12
Visible and near-infrared spectral survey of select carbonaceous chondritesamples of the National Institute of Polar Research: Results of CI/Cmchondrites

Takahiro Hiroi, Hiroshi Kaiden, Naoya Imae, Akira Yamaguchi, Hideyasu Kojima, Sho Sasaki, Takaaki Misu, Moe Matsuoka, Tomoki Nakamura

2013年度第4回極域科学シンポジウム　2013/11/12
Cathodoluminescence microscopy and spectroscopy of a plagioclase particlefrom asteroid Itokawa: Results of a preliminary investigation

Arnold Gucsik, Tomoki Nakamura, Hirotsugu Nishido, KiyotakaNinagawa, Yuki Kimura, Masahiro Kayama, Akira Tsuchiyama, Szaniszlo Berczi, Akos Kereszturi

2013年度第4回極域科学シンポジウム　2013/11/12
A STRONG LINK BETWEEN ITOKAWA PARTICLES AND EQUILIBRATED LL CHONDRITES INFERRED FROM OXYGEN ISOTOPE RATIOS

D. Nakashima, N. T. Kita, T. Ushikubo, T. Noguchi, T. Nakamura, J. W. Valley

HAYABUSA2013:Symposium of Solar System Materials　2013/10/16
SYLVITE AND HALITE CRYSTALS ON AN ITOKAWA PARTICLE: SALTS ON ITOKAWA?

T. Noguchi, M. Kimura, T. Hashimoto, M. Konno, T. Nakamura, M. E. Zolensky, A. Tsuchiyama, T. Matsumoto, J. Matsuno, R. Okazaki, M. Uesugi, Y. Karouji, T. Yada, Y. Ishibashi, K. Shirai, M. Abe, T. Okada

HAYABUSA2013:Symposium of Solar System Materials　2013/10/16
Outline of HAYABUSA Sample Preliminary Examination Results

A. Tsuchiyama, T. Nakamura, H. Yurimoto, M. Ebihara, T. Noguchi, K. Nagao, H. Naraoka, F. Kitajima, T. R. Ireland, S. A. Sandford, M. E. Zolensky, M. Abe, T. Okada, T. Yada, Y. Ishibashi, Y. Karouji, M. Uesugi, HAYA-BUS sample preliminary examination, team members

HAYABUSA2013: Symposium of Solar System Materials　2013/10/16
Surface morphology of Itokawa regolith particles related to space weathering on Itokawa

T. Matsumoto, A. Tsuchiyama, A. Miyake, K. Yasuda, N. Watanabe, A. Kouchi, A. Takigawa, T. Noguchi, Y. Nakata, T. Nakamura, J. Matsuno, A. Shimada

HAYABUSA2013: Symposium of Solar System Materials　2013/10/16
Bulk Chemical Compositions of Tiny Grains Recovere by the HAYABUSA Spacecraft - A NAA Study

M. Ebihara, N. Shirai, S. Sekimoto, T. Nakamura, A. Tsuchiyama, J. Matsuno, T. Matsumoto, Abe, A. Fuji-mura, Y. Ishibashi, Y. Karouji, T. Mukai, T. Okada, M. Uesugi, T. Yada

HAYABUSA2013: Symposium of Solar System Materials　2013/10/16
Recent Progress in Hayabusa Sample Analysis on 3D Microstructure and Surface Morphology: Comparison with Chondrite and Processes on the Asteroid Surface

A. Tsuchiyama, T. Matsumoto, K. Uesugi, T. Nakano, M. Uesugi, J. Matsuno, A. Shimada A. Takeuchi, Y. Suzuki, T. Nakamura, T. Noguchi, M. Abe, T. Yada, Y. Karouji, Y. Ishibashi, K. Shirai, T. Okada, A. Fujimura

HAYABUSA2013: Symposium of Solar System Materials　2013/10/16
How we find the best sampling sites on the asteroid JU3?

Tomoki Nakamura, Takahiro Hiroi

Hayabusa2 Joint Science Team(HJST)会議　2013/09/19
炭素質コンドライトの反射スペクトルによるC 型小惑星の分光特性精密化

中村智樹, 三須貴瑛, 松岡萌, 脇田茂, 廣井孝弘, 佐々木晶

2013年度日本地球化学会第60回年会　2013/09/11
CM 隕石中の高い10Be/9Be 初生比を示すmelilite に富むCAI

山野辺正邦, 中村智樹, 嘉数勇基, 石田初美

2013年度日本地球化学会第60回年会　2013/09/11
Organic Nitrogen Cosmochemistry of Ultracarbonaceous Micrometeorite International-presentation

Yabuta H, Noguchi T, Itoh S, Tsujimoto S, Sakamoto N, Hashiguchi M, Abe K, Kilcoyne D, Okubo A, Okazaki R, Tachibana S, Terada K, Nakamura T, Ebihara M, Nagahara H

Goldschmidt Conference 2013　2013/08/25
はやぶさ２近赤外分光計NIRS3によるサイエンス

北里宏平, 岩田隆浩, 安部正真, 大竹真紀子, 廣井孝弘, 中村智樹, 小松睦美, 荒井朋子, 千秋博紀, 平田成, はやぶさ, NIRS3チーム

第46回月・惑星シンポジウム　2013/08/05
DESTINY派生機による小惑星3200Phaethon探査計画

荒井朋子, 春日敏測, 大塚勝仁, 中村智樹, 中藤亜衣子, 中村良介, 渡部潤一, 伊藤孝士, 小林正規, 川勝康弘, 中村メッセンジャー圭子, 小松睦美, 三河内岳, 亀田真吾, 中宮賢樹, 千秋博紀, 和田浩二, 大野宗祐, 石橋高, 石丸亮, Ralph Srama

第46回月・惑星シンポジウム　2013/08/05
はやぶさ２サンプラーのめざす成果と開発現状

橘省吾, 澤田弘崇, 岡田隆司, 高野淑識, 中村智樹, 三浦弥生, 野口高明, 岡本千里, 和田浩二, 黒澤耕介, 矢野創, はやぶさ, サンプラーチーム

第46回月・惑星シンポジウム　2013/08/05
DIVERSITY OF THERMAL EVOLUTION PROCESSES IN THE HYDROUS ASTEROIDS IDENTIFIED IN THERMALLY METAMORPHOSED CARBONACEOUS CHONDRITE PCA 02012 International-presentation

A. Nakato, A. J. Brearley, T. Nakamura, T. Noguchi, I. Ahn, J. I. Lee, M. Matsuoka, S. Sasaki

76th Annual Meteoritical Society Meeting　2013/07/29
MET00432: Another Tagish Lake-type Carbonaceous Chondrite from Antarctica International-presentation

T. Nakamura, T. Noguchi, Y. Kimura, T. Hiroi, I. Ahn, J. I.Lee, S. Sasaki

76th Annual Meteoritical Society Meeting　2013/07/29
A FINE-GRAINED POLYCRYSTALLINE MICRO-METEORITE: AN ASTEROIDAL DUST PARTICLE WITH A UNIQUE MINERALOGY International-presentation

T. Noguchi, S. Tsujimoto, R. Okazaki, T. Nakamura, M. Ebi-hara, S. Ito, H. Nagahara, S. Tachibana, K. Terada, H. Yabu-ta

76th Annual Meteoritical Society Meeting　2013/07/29
Shisr 007 ユレーライトの炭素質物質中の不均一希ガス分布

安藤高太郎, 岡崎隆司, 中村智樹

日本地球惑星科学連合大会2013年大会　2013/05/19
反射スペクトルに基づくＨコンドライト隕石母天体表層での宇宙風化速度の推定

三須貴瑛, 中村智樹, 木村勇気

日本地球惑星科学連合大会2013年大会　2013/05/19
自由浮遊ナノ粒子の赤外スペクトルその場計測実験と未同定バンド解明への挑戦

石塚紳之介, 木村勇気, 中村智樹

日本地球惑星科学連合大会2013年大会　2013/05/19
マーチソン隕石を用いたC型小惑星における宇宙風化作用の再現実験

松岡萌, 中村智樹, 木村勇気

日本地球惑星科学連合大会2013年大会　2013/05/19
南極とっつき岬から回収した非溶融宇宙塵の鉱物学的研究

田澤賢, 中村智樹, 木村勇気

日本地球惑星科学連合大会2013年大会　2013/05/19
Be-B 法を用いたmelilite に富むCAI の年代決定の試み

山野辺正邦, 中村智樹, 嘉数勇基, 石田初美

日本地球惑星科学連合大会2013年大会　2013/05/19
はやぶさ２搭載近赤外分光計NIRS3の地上試験結果から期待される科学

岩田隆浩, 北里宏平, 安部正真, 大竹真紀子, 松浦周二, 津村耕司, 仲内悠祐, 荒井武彦, 廣井孝弘, 千秋博紀, 小松睦美, 中村智樹, 渡邊誠一郎

日本地球惑星科学連合大会2013年大会　2013/05/19
Noble gas isotopes of micrometeorites collected from Antarctic snow

Ryuji Okazaki, Yu Tobimatsu, Takaaki Noguchi, Shinichi Tsujimoto, Aya Okubo, Tomoki Nakamura, Mitsuru Ebihara, Shoichi Ito, Hikaru Yabuta, Shogo Tachibana, Hiroko Nagahara, Kentaro Terada

日本地球惑星科学連合大会2013年大会　2013/05/19
Chemical compositions of cosmic dust samples recovered from Antarctic snow

Mitsuru Ebihara, Shun Sekimoto, Naoki, Shirai, Shinichi Tsujimoto, Takaaki Noguchi, Tomoki Nakamura, Ryuji Okazaki, Shoichi Itoh, Shogo Tachibana, Hikaru Yabuta, Kentaro Terada, Aya Okubo, Hiroko Nagahara

日本地球惑星科学連合大会2013年大会　2013/05/19
Development of a new analytical scheme for micrometeorites and discovery of micrometeorites with intriguing mineralogy

Shinichi Tsujimoto, Takaaki Noguchi, Ryuji Okazaki, Tomoki Nakamura, Mitsuru Ebihara, Shoichi Itoh, Hiroko Nagahara, Shogo Tachibana, Kentaro Terada, Hikaru Yabuta

日本地球惑星科学連合大会2013年大会　2013/05/19
Evidence for extended aqueous alteration in CR carbonaceous chondrites International-presentation

J.M. Trigo-Rodriguez, C.E. Moyano-Cambero, N. Mestres, J. Fraxedas, M. Zolensky, T. Nakamura, Z.Martins

43nd Lunar and Planetary Science Conference　2013/03/19
PCA 02012: An unique thermally metamorphosed carbonaceous chondrite International-presentation

A. Nakato, A. J. Brearley, T. Nakamura, T. Noguchi, I. Ahn, J. I. Lee, M. Matsuoka, S. Sasaki

43nd Lunar and Planetary Science Conference　2013/03/19
Evidence of minimum aueous alteration in rock-ice body: update of organic chemistry and mineralogy of ultracarbonaceous antarctic micrometeorite International-presentation

H. Yabuta, T. Noguchi, S. Itoh, N. Sakamoto, M. Hashiguchi, K. Abe, S. Tsujimoto, A. L, D. Kilcoyne, A.Okubo, R. Okazaki, S Tachibana, T. Nakamura, K. Terada, M. Ebihara, H. Nagahara

43nd Lunar and Planetary Science Conference　2013/03/19
Results of the critical design for NIRS3: The near infrared spectrometer on Hayabusa-2 International-presentation

T. Iwata, K. Kitazato, M. Abe, M. Ohtake, S. Matsuura, K. Tsumura, N. Hirata, C. Honda, Y. Takagi, Y. Nakauchi, T. Hiroi, H. Senshu, T. Arai, T. Nakamura, T. Matsunaga, M. Komatsu, N. Takato, S. Watanabe

43nd Lunar and Planetary Science Conference　2013/03/19
Chemical composition of dust samples recovered from Antarctic snow International-presentation

M. Ebihara, S. Sekimotoi, N. Shirai, S. Tsujimoto, T. Noguchi, T. Nakamura, R. Okazaki, M. Ito, S. Tachibana, K. Yabuta, K. Terada, H. Nagahara

43nd Lunar and Planetary Science Conference　2013/03/19
Oxygen three-isotope ratios of silicate particles returned from asteroid Itokawa by the Hayabusa spacecraft: A strong link to equilibrated LL chondrites International-presentation

D. Nakashima, N. T. Kita, T. Ushikubo, T. Noguchi, T. Nakamura, J. W. Valley

43nd Lunar and Planetary Science Conference　2013/03/19
KEYS TO DETECT SPACE WEATHERING ON VESTA: CHANGES OF VISIBLE AND NEARINFRARED REFLECTANCE SPECTRA OF HEDS AND CARBONACEOUS CHONDRITES International-presentation

T. Hiroi, S.Sasaki, T. Misu, T. Nakamura

43nd Lunar and Planetary Science Conference　2013/03/19
The mineral ratio of Itokawa samples - Difference between two rooms of the Hayabusa sample catcher International-presentation

T. Yada, M. Abe, T. Okada, M. Uesugi, Y. Karouji, Y. Ishibashi, S. Yakame, K. Shirai, T. Nakamura, T. Noguchi, R. Okazaki, M. Fujimoto, M. Yoshikawa

43nd Lunar and Planetary Science Conference　2013/03/19
Delivery of typical cometary dust to the surface of the Earth International-presentation

T. Noguchi, N. Ohashi, S. Tsujimoto, J. P. Bradley, T. Nakamura, S. Toh, T. Stephan, N. Iwata, N.Imae

43nd Lunar and Planetary Science Conference　2013/03/19
小惑星と彗星の砂に秘められた初期太陽系進化

西川シンポジウム　2013/03/13
小惑星探査機はやぶさが持ち帰った宝物

早稲田大学高等研究所第1回宇宙シンポジウム　2013/03/05
はやぶさが持ち帰ったイトカワの塵に秘められた小惑星形成史

駿台天文講座、第562回講演会　2013/01/19
たんぽぽ（地球と宇宙空間の微生物と有機物の双方向伝播）WG報告：微生物、宇宙塵有機物、スペースデブリの捕集実験

藪田ひかる, 奥平恭子, 横堀伸一, 河口優子, 小林憲正, 三田肇, 河合秀幸, 田端誠, 今井栄一, 浜瀬健司, 中嶋悟, 福島和彦, 野口高明, 土山明, 中村智樹, 伊藤元雄, 三河内岳, 長谷川直, 東出真澄, 橋本博文, 矢野創, 山岸明彦

第13回宇宙科学シンポジウム　2013/01/08
はやぶさ２近赤外分光計（NIRS3）：目指すサイエンスと機器開発の現状

北里宏平, 岩田隆浩, 安部正真, 大竹真紀子, 松浦周二, 津村耕司, 仲内悠祐, 高木靖彦, 松永恒雄, 平田成, 本田親寿, 高遠徳尚, 廣井孝弘, 中村智樹, 小松睦美, 荒井朋子, 千秋博紀

第13回宇宙科学シンポジウム　2013/01/08
New perspective for early solar system evolution derived from recent sample return missions International-presentation

Cosmochemistry of primitive bodies-The need for MarcoPolo-R - a European sample return space mission　2012/12/17
イトカワ微粒子の物質科学

中村智樹

惑星科学会始原天体研究会　2012/12/01
The characteristics of Hayabusa returned samples and their distributions for NASA and international announcement of opportunity (AO)

矢田達, 安部正真, 岡田達明, 上椙真之, 唐牛譲, 石橋之宏, 八亀彰吾, 白井慶, 中村智樹, 野口高明, 岡崎隆司, 藤本正樹, 吉川真

第3回極域科学シンポジウム／第35回南極隕石シンポジウム,　2012/11/26
小惑星イトカワ粒子のサイズ分布・鉱物比率について

日本惑星科学会2012秋季講演会　2012/10/24
国際宇宙ステーションから回収されたコンドルール様物体について

野口高明, 中村智樹, 牛久保孝行, 木多紀子, バレージョン, 山中理代, 木本雄吾, 北澤幸人

日本鉱物科学会　2012/09/19
Te-Xe法による鉱化年代測定一熱水性金鉱床を例としてー

高岡宣雄, 島田允尭, 島正子, 中村智樹, 長尾敬介, 佐川斉, 岡崎隆司, 島田和彦

日本地球化学会年会　2012/09/10
小惑星イトカワから回収された粒子の化学組成

海老原充, 白井直樹, 関本俊, 中村智樹, 土’山明

日本地球化学会年会　2012/09/10
扁平したコンドリュールを含むＣＭ炭素質隕石

中村智樹, 中藤亜衣子, 宮原正明, 吉岡勝樹, 上椙真之, 上杉健太朗

日本地球化学会年会　2012/09/10
Coexisting Nitrogen-Rich and Poor Organic Materials in Ultracarbonaceous Antarctic Micrometeorite

H. Yabuta, S. Itoh, T. Noguchi, N. Sakamoto, M. Hashiguchi, K. Abe, S. Tsujimoto, A. L, D. Kilcoyne, A. Okubo, R. Okazaki, S. Tachibana, K. Terada, T. Nakamura, H. Nagahara

75th Annual Meeting of the Meteoritical Society　2012/08/12
A Mineral Ratio of Itokawa Particles Recovered from the Hayabusa Sample Catcher

T. Yada, M. Abe, T. Okada, M. Uesugi, Y. Karouji, Y. Ishibashi, S. Yakame, K. Shirai, T. Nakamura, T. Noguchi, R. Okazaki, A. Fujimura

75th Annual Meeting of the Meteoritical Society　2012/08/12
九大・初期記載によるイトカワ粒子の粒度分布及び鉱物比率について

矢田達, 藤村彰夫, 岡田達明, 上椙真之, 唐牛譲, 石橋之宏, 中村智樹, 野口高明, 岡崎隆司

第４５回月・惑星シンポジウムプログラム　2012/08/01
小惑星 Phaethon 探査計画とその科学的意義

荒井朋子, 春日敏測, 大塚勝仁, 中村智樹, 中藤亜衣子, 中村良介, 伊藤孝士, 渡部潤一, 小林正規, 川勝康弘, 中村圭子, 小松睦美, 千秋博紀, 和田浩二, 亀田真吾, 大野宗佑, 石橋高, 石丸亮, 中宮正樹

第４５回月・惑星シンポジウムプログラム　2012/08/01
超炭素質南極微隕石から見つかった窒素に富む有機物

薮田ひかる, 伊藤正一, 野口高明, 坂本直哉, 橋口未奈子, 阿部憲一, 辻本真一, A. L, D. Kilcoyne, 大久保彩子, 岡崎隆司, 橘省吾, 寺田健太郎, 中村智樹, 永原裕子

日本地球惑星科学連合2012年大会　2012/05/20
Shock state of the Itokawa samples

マイクゾレンスキー, 中村智樹, 三河内岳, 萩谷健二, 大隅一昌, 田中雅彦, 野口高明, 木村真, 土山明, 中藤亜衣子, 大神稔皓, 石田初美, 上椙真之, 矢田達, 白井慶, 藤村彰夫, 岡崎隆司, 石橋幸弘, 安部正真, 岡田達明, 上野宗孝, 向井利典, 吉川真, 川口淳一郎

日本地球惑星科学連合2012年大会　2012/05/20
反射スペクトルから推定されるＣ型小惑星の多様性

中村智樹, 中藤亜衣子, 三須貴瑛, 松岡萌, 脇田茂, 廣井孝弘, 佐々木晶

日本地球惑星科学連合2012年大会　2012/05/20
顕微分光による”はやぶさ”微粒子の分析

北島富美雄, 小嗣真人, 大河内拓雄, 奈良岡浩, 石橋之宏, 唐牛譲, 上椙真之, 安部正真, 藤村彰夫, 岡崎隆司, 矢田達, 中村智樹, 野口高明, 長尾敬介, 土‘山明, 圦本尚義, 向井利典, スコットサンドフォード, 岡田達明, 白井慶, 上野宗孝, 吉川真, 川口淳一郎

日本地球惑星科学連合2012年大会　2012/05/20
イトカワ粒子の宇宙風化産物のSTEM 観察とN2 パージ環境の重要性

野口高明, 木村眞, 橋本隆仁, 今野充, 中村智樹, Zolensky Michael, 田中雅彦, 藤村彰夫, 安部正真, 矢田達, 向井利典, 上野宗孝, 岡田達明, 白井慶, 石橋之宏, 上椙真之, 唐牛譲, 岡崎隆司, 土山明

日本地球惑星科学連合2012年大会　2012/05/20
はやぶさ回収試料の初期分析２:酸素同位体分析、微量元素分析

伊藤正一, 圦本尚義, 坂本直哉, 小林幸雄, 橋爪光, 土山明, 瀬戸雄介, アイルランドトレバー, Zolensky Michael, 中村智樹, 野口高明, 長尾敬介, 海老原充, 奈良岡浩, 岡崎隆司, 北島富美雄, 向井利典, 藤村彰夫, 安部正真, 矢田達, 上椙真之, 吉川真, 川口淳一郎

日本地球惑星科学連合2012年大会　2012/05/20
イトカワレゴリスの微細表面構造ーLL コンドライトおよび衝突実験生成物との比較

松本徹, 土山明, Gucsik Arnold, 門野敏彦, 永木恵太, 野口遼, 松野淳也, 永野宗, 今井悠太, 島田玲, 上椙真之, 上杉健太郎, 中野司, 竹内昇久, 鈴木芳生, 近藤忠, 境家達弘, 中村智樹, 野口高明

日本地球惑星科学連合2012年大会　2012/05/20
25 GPa におけるアルミナスペロフスカイト中のSi とMgの拡散

下宿彰, 久保友明, 加藤工, 芳野極, 山崎大輔, 中村智樹, 岡崎隆司, チャクラボルティースーミット

日本地球惑星科学連合2012年大会　2012/05/20
小惑星Phaethon探査提案

荒井朋子, 春日敏測, 大塚勝仁, 中村智樹, 中藤亜衣子, 中村良介, 伊藤孝士, 渡部潤, 小林正規, 川勝康弘, 中村圭子, 小松睦美, 千秋博紀, 和田浩二, 石橋高, 亀田真吾, 大野宗祐, 石丸亮

日本地球惑星科学連合2012年大会　2012/05/20
「月惑星探査の来る10年」検討：第二段階パネルからの報告

向井正, 杉田精司, 笠羽康正, 中村智樹, 田村元秀

日本地球惑星科学連合2012年大会　2012/05/20
レゴリス起源隕石の反射スペクトルに基づく宇宙風化速度の推定

三須貴瑛, 中村智樹, 佐々木晶, 廣井孝弘

日本地球惑星科学連合2012年大会　2012/05/20
強い衝撃を受けたＣＭ炭素質コンドライトの発見

中村智樹, 吉岡勝樹, 中藤亜衣子, 宮原正明

日本地球惑星科学連合2012年大会　2012/05/20
Integrated Visible/Near-Infrared Spectra of the HAYABUSA Sampling Sites and their Implications on the Maturity of the Returned Sample

中村良介, 平田成, 石黒正晃, 北里宏平, 野口高明, 中村智樹, 廣井孝弘, 矢野創

Asteroids, Comets, Meteors(ACM)　2012/05/16
New perspective for early solar system evolution derived from recentsample return missions

深宇宙探査シンポジウム　2012/05/14
新しく発見された炭素質コンドライト隕石についてD型小惑星の物質か？

中村智樹

神戸大学CPSセミナー　2012/03/28
Finding of Nitrogen-Rich Organic Material in Antarctic Ultracarbonaceous Micrometeorite International-presentation

H. Yabuta, S. Itoh, T. Noguchi, N. Sakamoto, M. Hashiguchi, K. Abe, S. Tsujimoto, A. L, D. Kilcoyne, A. Okubo, R. Okazaki, S. Tachibana, K. Terada, T. Nakamura, H. Nagahara

43rd Lunar and Planetary Science Conference　2012/03/19
Neutron Activation Analysis of Rocky Grains Recovered by the Hayabusa Spacecraft – Revisited

M. Ebihara, S. Sekimoto, N. Shirai, T. Nakamura, A. Tsuchiyama, M. Abe, A. Fujimura, T. Mukai, T. Yada

43rd Lunar and Planetary Science Conference　2012/03/19
Micro-Structures of Particle Surfaces of Itokawa Regolith and LL Chondrite Fragments International-presentation

T. M. Matsumoto, A. T. Tsuchiyama, A. G. Gucsik, R. N. Noguchi, J. M. Matsuno, T. N. Nagano, Y. I. Imai, A. S. Shimada, M. U. Uesugi, K. U. Uesugi, T. N. Nakano, A. T. Takeuchi, Y. S. Suzuki, T. Nakamura, T. N. Noguchi, T. M. Mukai, M. A. Abe, T. Y. Yada, A. F. Fujimura

43rd Lunar and Planetary Science Conference　2012/03/19
Space Weathering Products Found on the Surfaces of the Itokawa Dust Particles: A Summary of the Initial Analysis International-presentation

T. Noguchi, M. Kimura, T. Hashimoto, M. Konno, T. Nakamura, A. Nakato, T. Ogami, H. Ishida, R. Sagae, S. Tsujimoto, A. Tsuchiyama, M. E. Zolensky, M. Tanaka, A. Fujimura, M. Abe, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi, R. Okazaki

43rd Lunar and Planetary Science Conference　2012/03/19
Three-Dimensional Structures of Itokawa Particles Using Micro-Tomography: Comparison with LL5 and LL6 Chondrites

A. Tsuchiyama, M. Uesugi, K. Uesugi, T. Nakano, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, A. Shimda, A. Takeuchi, Y. Suzuki, T. Nakamura, T. Noguchi, T. Mukai, M. Abe, T. Yada, A. Fujimura

43rd Lunar and Planetary Science Conference　2012/03/19
The First Recovery of Asteroidal Samples by the Hayabusa Mission International-presentation

T. Nakamura, T. Noguchi, A. Tshuchiyama, H. Yurimoto, K. Nagao, M. Ebihara, R. Okazaki, F. Kitajima, H. Naraoka, M. Abe, A. Fujimura, T. Yada, T. Okada, Y. Ishibashi, K.Shirai, T. Mukai, H. Yano, T. Yamada, H. Kuninaka, M. Yoshikawa, J. Kawaguchi

American Geophysical Union Fall Meeting　2011/12/05
Sample Curation in the JAXA's Planetary Material Curation Facility International-presentation

T. Okada, M. Abe, A. Fujimura, T. Yada, Y. Ishibashi, M. Uesugi, Y. Karouji, S. Yakame, T. Nakamura, T. Noguchi, R. Okazaki, M.E. Zolensky, S. Sandford, T. Mukai, M. Ueno, M, Yoshikawa, J. Kawaguchi

American Geophysical Union Fall Meeting　2011/12/05
Conditions of aqueous alteration of 9 CM chondrites estimated from mineralogy and compositional variations of matrix International-presentation

K. Yoshioka, T. Nakamura, H. Fujimaki

American Geophysical Union Fall Meeting　2011/12/05
The Timing and the Heating Conditions of Compound Chodnrule Formation International-presentation

K. Sakamoto, T. Nakamura, N. T. Kita, D. Nakashima

日韓合同質量分析学会　2011/11/23
Asteroid Itokawa sample curation and distribution in the Planetary Material Sample Curation Facility of JAXA. Antarctic Meteorites XXXIV International-presentation

T. Yada, A. Fujimura, M. Abe, T. Okada, Y. Ishibashi, K. Shirai, M. Uesugi, Y. Karouji, S. Yakame, T. Nakamura, T. Noguchi, R. Okazaki, T.Mukai, M. Ueno, M. Yoshikawa, J. Kawaguchi

National Institute of Polar Research　2011/11/17
「月惑星探査来たる10 年」検討第二段階の説明

並木則行, 向井正, 中村智樹, 笠羽康正, 田村元秀, 大槻圭史

太陽系科学シンポジウム　2011/11/15
hemical and mineralogical characteristics of dust particles returned by the Hayabusa mission International-presentation

T. Nakamura

Workshop on Chemical Evolution of the Universe　2011/10/31
はやぶさ帰還試料キュレーションの現状

矢田達, 藤村彰夫, 安部正真, 岡田達明, 石橋之宏, 白井慶, 上椙真之, 唐牛譲, 八亀彰吾, 中村智樹, 野口高明, 岡崎隆司, 向井利典, 上野宗孝, 吉川真, 川口淳一郎

日本惑星科学会2011秋季講演会　2011/10/23
はやぶさキュレーションチーム, イトカワ母天体の材料物質

中村智樹, 野口高明, 田中雅彦, Mike Zolensky, 木村真, 中藤亜衣子, 大神稔皓, 石田初美, 土山明, 岡崎隆司, Scott Sandford, 脇田茂

日本惑星科学会2011秋季講演会　2011/10/23
イトカワ母天体の熱進化

圦本尚義, 中村智樹

日本惑星科学会2011秋季講演会　2011/10/23
イトカワ母天体物質の起源

海老原充, 関本俊, 白井直樹, 浜島靖典, 山本政儀, 熊谷和也, 大浦泰嗣, Trever Ireland, 北島富美雄, 長尾敬介, 中村智樹, 奈良岡浩, 野口高明, 岡崎隆司, 土山明, 上椙真之, 圦本尚義, Michael Zolensky, 安部正真, 藤村彰夫, 向井利典, 矢田達

日本惑星科学会2011秋季講演会　2011/10/23
イトカワ上の礫と微粒子の組織が語るイトカワの過去

野口高明, 中村智樹, 木村眞, Mike Zolensky, 田中雅彦, 土'山明, 岡崎隆司

日本惑星科学会2011秋季講演会　2011/10/23
はやぶさキュレーションチーム, イトカワでのレゴリス生成と進化

土'山明, 上椙真之, 松島亘志, 道上達弘, 門野敏彦, 中村智樹, 上杉健太朗, 中野司, Scott A. Sandford, 野口遼, 松本徹, 松野淳也, 永野崇, 今井悠太, 竹内晃久, 鈴木芳生, 大神稔皓, 片桐淳, 海老原充, Trevor Ireland, 北島富美雄, 長尾敬介, 奈良岡浩, 野口高明, 岡崎隆司, 圦本尚義, Michael Zolensky

日本惑星科学会2011秋季講演会　2011/10/23
イトカワでのレゴリス年代学

長尾敬介, 岡崎隆司, 中村智樹, 三浦弥生, 大澤崇人, 馬上謙一, 松田伸太郎, 海老原充, Trevor. R. Ireland, 北島富美雄, 奈良岡浩, 野口高明, 土'山明, 上椙真之, 圦本尚義, Michael.E. Zolensky, 白井慶, 安部正真, 矢田達, 石橋之宏, 藤村彰夫, 向井利典, 上野宗孝, 岡田達明, 吉川真, 川口淳一郎

日本惑星科学会2011秋季講演会　2011/10/23
はやぶさキュレーションチーム, イトカワにおける宇宙風化

野口高明, 中村智樹, 木村眞, Mike Zolensky, 田中雅彦, 橋本隆仁, 今野充, 中藤亜衣子, 大神稔皓, 岡崎隆司

日本惑星科学会2011秋季講演会　2011/10/23
Mineralogical and Isotope Characteristics of Chondrules, CAIs, and Fine-grained Materials in Short-period Comet Wild 2

中村智樹

フェートン研究会　2011/09/28
小惑星イトカワの酸素同位体組成，26Al 初生存在度，微量元素組成

圦本尚義, 伊藤正一, 坂本直哉, 小林幸雄, 橋爪光, 土山明, 瀬戸雄介, Ireland T. R, Zolensky M, 中村智樹, 野口高明, 長尾敬

日本地球化学会　2011/09/14
はやぶさキュレーションチーム, 小惑星イトカワから回収されたレゴリス粒子の３次元構造と外形

土山明, 上椙真之, 松島亘志, 道上達弘, 門野敏彦, 中村智樹, 上杉健太朗, 中野司, スコットサンドフォード, 野口遼, 松本徹, 松野淳也, 永野崇, 今井悠太, 竹内晃久, 鈴木芳生, 大神稔皓, 片桐淳, 海老原充, アイルランドトレバー, 北島富美雄, 長尾敬介, 奈良岡浩, 野口高明, 岡崎隆司, 圦本尚義

日本地球化学会　2011/09/14
小惑星探査機はやぶさが回収したイトカワレゴリス粒子の３次元構造と初期分析におけるX線マイクロCTの役割

顫山明, 上椙真之, 松島亘志, 道上達弘, 門野敏彦, 中村智樹

日本地質学会第118学術大会　2011/09/09
小惑星探査機はやぶさが回収したイトカワ微粒子の鉱物学的研究

中村智樹, 野口高明, 田中雅彦, クゾレンスキー, 木村真, 顫山明, 中藤亜衣子, 大神稔皓, 石田初美, 上椙真之, 矢田達, 白井慶, 岡崎隆司, スコットサンドフォード, 脇田茂, 藤村彰夫, 石橋之宏, 安部正真, 岡田達明, 上野宗孝, 向井利典, 吉川真, 川口淳一郎

日本地質学会第118学術大会　2011/09/09
三畳紀新世における天体衝突と絶滅事変

尾上哲治, 佐藤峰南, 中村智樹, 野口高明, 初川雄一, 大澤崇人, 小泉光生, 藤暢輔, 海老原充

日本地質学会第118学術大会　2011/09/09
シンクロトロンガンドルフィカメラの評価と鉱物科学への応用

田中雅彦, 中村智樹, 野口高明, 勝矢良雄, 松下能孝

日本地質学会第118学術大会　2011/09/09
美濃帯の上部三畳系遠洋性堆積岩中に記録された天体衝突の証拠

佐藤峰南, 尾上哲治, 中村智樹, 野口高明, 初川雄一, 大澤崇人, 小泉光生, 藤暢輔, 海老原充

日本地質学会第118学術大会　2011/09/09
小惑星イトカワの元天体の熱史

中村智樹

地球外起源固体微粒子に関する総合研究集会　2011/08/26
The Variety of Thermal Evolution of Primitive Hydrous Asteroids Recorded in Dehydrated Carbonaceous Chondrites International-presentation

A. Nakato, T. Nakamura, T. Noguchi, I. Ahn, J. I. Lee

74th Annual Meteoritical Society Meeting　2011/08/08
QUE 97186 and RBT 04143: Two Extreme Varieties of CV3 Carbonaceous Chondrites International-presentation

H. Ishida, T. Nakamura, H. Miura, Y. Kakazu

74th Annual Meteoritical Society Meeting　2011/08/08
Hayabusa Sample Curation at Planetary Material Sample Curation Facility in JAXA International-presentation

T. Yada, A. Fujimura, M. Abe, T. Nakamura, T. Noguchi, R. Okazaki, T. Okada, Y. Ishibashi, K. Shirai, M. E. Zolensky, S. Sandford, M. Uesugi, Y. Karouji, M. Ueno, T. Mukai, M. Yoshikawa, J. Kawaguchi

74th Annual Meteoritical Society Meeting　2011/08/08
Mineralogy and Thermal History of Itokawa Surface Particles Recovered by Hayabusa Mission International-presentation

T. Nakamura, T. Noguchi, M. Tanaka, M. E. Zolensky, M. Kimura, A. Tsuchiyama, A. Nakato, T. Ogami, H. Ishida, M. Uesugi, T. Yada, K. Shirai, A. Fujimura, R. Okazaki, S. Sandford, S. Wakita, Y. Ishibashi, M. Abe, T. Okada, M. Ueno, T. Mukai, M. Yoshikawa, J. Kawaguchi

4th Annual Meteoritical Society Meeting　2011/08/08
A Preliminary Micro-Spectroscopic Analysis of the Carbonaceous Matter in the Particles Recovered by the Hayabusa Mission International-presentation

F. Kitajima, M. Kotsugi, T. Ohkochi, H. Naraoka, Y. Ishibashi, M. Abe, A. Fujimura, R. Okazaki, T. Yada, T. Nakamura, T. Noguchi, K. Nagao, A. Tsuchiyama, H. Yurimoto, M. Ebihara, T. Mukai, S. A. Sandford, T. Okada, K. Shirai, M. Ueno, M. Yoshikawa, J. Kawaguchi

74th Annual Meteoritical Society Meeting　2011/08/08
Oxygen and Magnesium Isotopic Compositions of Asteroid 25143 Itokawa Returned by the Hayabusa Mission International-presentation

H. Yurimoto, K. Abe, M. Abe, M. Ebihara, A. Fujimura, M. Hashiguchi, K. Hashizume, T. R. Ireland, S. Itoh, J. Katayama, C. Kato, J. Kawaguchi, N. Kawasaki, F. Kitajima, S. Kobayashi, T, Meike, T. Mukai, K. Nagao, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, C. Park, N. Sakamoto, Y. Seto, M. Takei, A. Tsuchiyama, M. Uesugi, S. Wakaki, T. Yada, K. Yamamoto, M. Yoshikawa, M. Zolensky

74th Annual Meteoritical Society Meeting　2011/08/08
he Role of Synchrotron Radiation Based X-Ray Microtomography in Examination of Small Extraterrestrial Samples Recovered by Spacecraft in the Stardust and Hayabusa Missions International-presentation

A. Tsuchiyama, T. Nakamura, M. Uesugi, K. Uesugi, T. Nakano, A. Takeuchi, Y. Suzuki, Y. Iida, R. Niimi, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, T. Ogami, T. Noguchi, M. E. Zolensky, T. Mukai, M. Abe, T. Yada, A. Fujimura

74th Annual Meteoritical Society Meeting　2011/08/08
Origin and Evolution of Itokawa Regolith Particles Based on Three-Dimensional Shapes and Sizes of Hayabusa Samples International-presentation

A. Tsuchiyama, M. Uesugi, T. Matsushima, T. Michikami, T. Kadono, T. Nakamura, K. Uesugi, T. Nakano, S. A. Sandford, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, A. Takeuchi, Y. Suzuki, T. Ogami, J. Katagiri, M. Ebihara, T. R. Ireland, F. Kitajima, K. Nagao, H. Naraoka, T. Noguchi, R. Okazaki, H. Yurimoto, M. E. Zolensky, T. Mukai, M. Abe, T. Yada, A. Fujimura, M. Yoshikawa, J. Kawaguchi

74th Annual Meteoritical Society Meeting　2011/08/08
Solar Noble Gases in Itokawa Regolith Materials Returned by the Hayabusa Mission International-presentation

K. Nagao, R. Okazaki, T. Nakamura, Y. N. Miura, T. Osawa, K. Bajo, S. Matsuda, M. Ebihara, T. R. Ireland, F. Kitajima, H. Naraoka, T. Noguchi, A. Tsuchiyama, M. Uesugi, H. Yurimoto, M. E. Zolensky, K. Shirai, M. Abe, T. Yada, Y. Ishibashi, A. Fujimura, T. Mukai, M. Ueno, T. Okada, M. Yoshikawa, J. Kawaguchi

74th Annual Meteoritical Society Meeting　2011/08/08
Matrix Mineral Chemistry of TIL 08007 CM Chondrite: Implications for Intermediate Alteration International-presentation

H. W. Lee, S. T. Kwon, J. I. Lee, I. S. Ahn, T. Nakamura, A. Nagato

74th Annual Meteoritical Society Meeting　2011/08/08
Examination of Organic Compounds in the Hayabusa Samples from the Asteroid Itokawa International-presentation

H. Naraoka, H. Mita, K. Hamase, M. Mita, H. Yabuta, K. Saito, K. Fukushima, F. Kitajima, S. A. Sandford, T. Nakamura, T. Noguchi, R. Okazaki, K. Nagao, M. Ebihara, H. Yurimoto, A. Tsuchiyama, M. Abe, K. Shirai, M. Ueno, T. Yada, Y. Ishibashi, T. Okada, A. Fujimura, T. Mukai, M. Yoshikawa, J. Kawaguchi

74th Annual Meteoritical Society Meeting　2011/08/08
First Direct Evidence of Asteroidal Space Weathering Found on the Surface of Itokawa Particles International-presentation

T. Noguchi, T. Nakamura, M. Kimura, M. E. Zolensky, M. Tanaka, T. Hashimoto, M. Konno, A. Nakato, T. Ogami, A. Fujimura, M. Abe, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi, R. Okazaki

74th Annual Meteoritical Society Meeting　2011/08/08
A new type of material formed by condensation in the early solar nebula International-presentation

T. Ogami, T. Nakamura, T. Noguchi, Y. Yamauchi, D. Nakashima, T. Ushikubo, N. T. Kita, J. W. Valley

Asia Oceania Geosciences Sciety　2011/08/08
小惑星探査機はやぶさが回収したイトカワ微粒子の鉱物学的特性

中村智樹

PFシンポジウム　2011/07/12
Preliminary examination of Hayabusa asteroidal samples: mineralogy and mineral-chemistry

中村智樹, 野口高明, 田中雅彦, Mike Zolensky, 木村真, 中藤亜衣子, 大神稔皓, 石田初美, 土山明, 上椙真之, 矢田達, 白井慶, 岡崎隆司, 藤村彰夫, 石橋之宏, 安部正真, 岡田達明, 上野宗孝, 向井利典

日本地球惑星科学連合2011年大会　2011/05/22
はやぶさ回収試料の初期分析：イトカワレゴリス粒子の３次元構造と初期分析におけるＸ線マイクロトモグラフィーの役割

土山明, 上椙真之, 上杉健太朗, 中野司, 中村智樹

日本地球惑星科学連合2011年大会　2011/05/22
Preliminary examination of Hayabusa asteroidal samples: Noble gases

長尾敬介, 岡崎隆司, 中村智樹, 三浦弥生, 大澤崇人, 馬上謙一, 松田伸太郎, 海老原充, T.R. Ireland, 北島富美雄, 奈良岡浩, 野口高明, 土山明, 上椙真之, 圦本尚義, M. Zolensky, 白井慶, 安部正真, 矢田達, 石橋之宏, 藤村彰夫, 向井利典, 上野宗孝, 岡田達明, 吉川真, 川口淳一郎

日本地球惑星科学連合2011年大会　2011/05/22
はやぶさ回収試料の初期分析：酸素同位体分析，Mg同位体分析

伊藤正一, 安部正真, 海老原充, 藤村彰夫, 橋爪光, アイルランドトレバー, 川口淳一郎, 北島富美雄, 向井利典, 長尾敬介, 中村智樹, 奈良岡浩, 野口高明, 岡崎隆司, 坂本直哉, 瀬戸雄介, 土山明, 上椙真之, 矢田達, 吉川真, 圦本尚義, Zolensky Michael

日本地球惑星科学連合2011年大会　2011/05/22
美濃帯南部, 上部トリアス系層状チャートからみつかったイリジウム異常，Ni に富むスピネル粒子，マイクロスフェルール

佐藤峰南, 尾上哲治, 中村智樹, 野口高明, 初川雄一, 大澤崇人, 藤暢輔, 小泉光生

日本地球惑星科学連合2011年大会　2011/05/22
美濃帯坂祝セクションの上部トリアス系チャートからみつかったイジェクタ層の堆積年代

尾上哲治, 佐藤峰南, 中村智樹, 初川雄一, 大澤崇人, 藤暢輔, 小泉光生

日本地球惑星科学連合2011年大会　2011/05/22
宇宙塵の形成：形状，組成，組織の関係

土居政雄, 中本泰史, 中村智樹, 山内佑司

日本地球惑星科学連合2011年大会　2011/05/22
Conditions of aqueous alteration of C-type asteroids deduced from mineralogy and oxygen isotope ratios of CM chondrite G

吉岡勝樹, 中村智樹, 藤巻宏和, 嘉数勇基

本地球惑星科学連合2011年大会　2011/05/22
Reduced type に分類されるCV3 炭素質コンドライト(RBT04143,QUE97186)の多様な形成進化過程

石田初美, 中村智樹, 三浦均, 嘉数勇基

日本地球惑星科学連合2011年大会　2011/05/22
小惑星探査機はやぶさ帰還粒子取り扱いに用いた静電制御微小マニピュレーションについて

藤村彰夫, 安部正真, 矢田達, 中村智樹, 野口高明, 岡崎隆司, 岡田達明, 白井慶, 石橋之宏, 小川真帆

日本地球惑星科学連合2011年大会　2011/05/22
はやぶさカプセル回収チーム, はやぶさミッション概要とカプセル回収

安部正真, 藤村彰夫, 矢野創, 岡本千里, 岡田達明, 矢田達, 石橋之宏, 白井慶, 中村智樹, 野口高明, 岡崎隆司, Zolensky Michael, Sandford Scott, Ireland Trevor, 上野宗孝, 向井利典, 吉川真, 山田哲哉, 國中均, 川口淳一郎

日本地球惑星科学連合2011年大会　2011/05/22
サンプルのキュレーション：経緯、現状、今後の予定

藤村彰夫, 安部正真, 矢田達, 中村智樹, 野口高明, 岡崎隆司, 石橋之宏, 白井慶, 岡田達明, 矢野創, Zolensky Michael, Sandford Scott, 山田哲哉, 上野宗孝, 向井利典, 吉川真, 川口淳一郎

日本地球惑星科学連合2011年大会　2011/05/22
小惑星イトカワから回収された微粒子表面のSEMとSTEM観察について

野口高明, 中村智樹, 木村眞, Zolensky Michael, 田中雅彦, 橋本隆仁, 今野充, 中藤亜衣子, 大神稔皓, 藤村彰夫, 安部正真, 矢田達, 向井利典, 上野宗孝, 岡田達明, 白井慶, 石橋之宏, 岡崎隆司

日本地球惑星科学連合2011年大会　2011/05/22
はやぶさ回収試料の初期分析：中性子放射化分析による粒子全岩元素分析

海老原充, 関本俊, 浜島靖典, 山本政儀, 熊谷和也, 大浦泰嗣, 奈良岡浩, 白井直樹, トレバーアイルランド, 北島富美雄, 長尾敬介, 中村智樹, 野口高明, 岡崎隆司, 土山明, 上椙真之, 圦本尚義, マイケルゾレンスキー, 安部正真, 藤村彰夫, 向井利典, 矢田達

日本地球惑星科学連合2011年大会　2011/05/22
はやぶさ回収試料の初期分析：炭素質物質の顕微分光

北島富美雄, 小嗣真人, 大河内拓雄, 奈良岡浩, 石橋之宏, 安部正真, 藤村彰夫, 岡崎隆司, 矢田達, 中村智樹, 野口高明, 長尾敬介, 土‘山明, 向井利典, スコットサンドフォード, 岡田達明, 白井慶, 上野宗孝, 吉川真, 川口淳一郎

日本地球惑星科学連合2011年大会　2011/05/22
はやぶさ回収試料の初期分析：有機化合物分析

奈良岡浩, 三田肇, 浜瀬健司, 三田真史, 薮田ひかる, 斎藤香織, 福島和彦, 北島富美雄, Scott A. Sandford, 中村智樹, 野口高明, 岡崎隆司, 長尾敬介, 海老原充, 圦本尚義, 土山明, 安部正

日本地球惑星科学連合2011年大会　2011/05/22
Mineralogy and Major Element Abundance of the Dust Particles Recovered from Muses-C Regio on the Asteroid Itokawa International-presentation

Nakamura et

42nd Lunar and Planetary Science Conference　2011/03
はやぶさ回収サンプルのキュレーション作業（3）～ピックアップサンプルの観察

中村智樹, 野口高明, 岡崎隆司, 藤村彰夫, 安部正真, 矢田達, 石橋之宏, 白井慶, 岡田達明, 上野宗孝, 向井利典

太陽系科学シンポジウム　2010/12
中野短周期彗星ビルド２に含まれるコンドリュールの鉱物学的同位体的特長

中村智樹, 野口高明, 土山明, 牛久保孝行, 木多紀子, ジョン・バレー, 高畑直人, 藤谷渉, 佐野有司, マイクゾレンスキー, 上杉健太朗

日本地球惑星科学連合2010年大会　2010/05

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Research Projects 43

原始惑星系円盤外縁部に存在した太陽系第三世界の初期状態の解明

中村智樹, 牛久保孝行, 上椙真之, 藤谷渉, 玄田英典

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 東北大学

2024/04/01 - 2029/03/31
To elucidate formation process of martian moons

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tokyo Institute of Technology

2021/04/05 - 2026/03/31
Japan-France joint research on the origin of Martian moons

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Institution: Tokyo Institute of Technology

2020/10/27 - 2026/03/31
新しい時代の太陽系物質科学：マルチスケールで見た含水小惑星の形成進化過程

中村智樹, 牛久保孝行, 上椙真之, 玄田英典, 臼井文彦, 三宅亮

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 東北大学

2020/04/01 - 2024/03/31

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はやぶさ２探査機が回収する予定の小惑星リュウグウサンプルの初期分析を担当するため，その分析方法の開発と炭素質隕石サンプルを用いたリハーサル分析を行った．また，小惑星リュウグウは天体表面の分光観察により，加熱された可能性があるため，CIコンドライトを用いて加熱実験を行い，その加熱物を用いて一連の分析を行った．大気遮断状態でのサンプルのハンドリング，大気遮断状態での反射スペクトル測定，大気遮断での放射光X線回折分析，大気遮断での放射光XANES分析，大気暴露下での放射光CT分析，走査型，および透過型電子顕微鏡を用いた組織観察などをCIコンドライト，CMコンドライト，およびその加熱物に対して行った．その結果，小惑星リュウグウの反射スペクトルはCIコンドライトの粗粒（ｍｍサイズ）粒子の300度程度に還元下で加熱したものと類似することが分かった．また，このとき，層状ケイ酸塩のＦｅの価数が3価に富んだ状態から2価に富んだ状態に還元されていることが分かった．一方，Ｘ線回折分析より300度の加熱では，層状ケイ酸塩（Saponite, serpentine）は分解していないことが分かった．一連の炭素質隕石を用いたリハーサルの結果と，実際のリュウグウ回収サンプルの分析結果を比較することで，小惑星リュウグウの形成進化史を解明することを目指す．
小惑星探査機はやぶさ２の回収試料の負ミューオンによる炭素濃度測定

中村智樹

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 新学術領域研究(研究領域提案型)

Institution: 東北大学

2021/04/01 - 2023/03/31
Solar System Exploration for Aqua-planetology

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Japan Aerospace EXploration Agency

2017/06/30 - 2022/03/31
小惑星探査機はやぶさ２の回収試料のミューオンによる炭素質物質分析法の確立

中村智樹

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 新学術領域研究(研究領域提案型)

Institution: 東北大学

2019/04/01 - 2021/03/31

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小惑星探査機はやぶさ２は、炭素質（C型）小惑星リュウグウの天体表面から岩石サンプルを採集し地球に帰還した。本研究の目的は、当該新学術研究で推進している負ミューオン非破壊元素分析をリュウグウ回収サンプルに適用するため、必要な精度と空間分解能を達成する分析手法や実験条件を確立することである。そのために、リュウグウ回収サンプルに近い物質である炭素質隕石やその模擬物質を分析対象とし、J-PARCにおいて半導体X線検出器を用いた負ミューオン3次元非破壊元素分析を行ってきた。今年度はCM炭素質隕石の岩片に負ミューオンを照射し炭素濃度の定量化を目指し2020年6月と12月に実験を行った。炭素質隕石の粉体をペレット化したサンプル5～50㎎程度を用い、600~1000KWの出力の負ミュオンを10~48時間し、ミュオン照射由来の炭素のX線（75.2keV）の微小なピークを確認した。ピーク強度を正確に求めるために、炭素のピーク付近のX線のバックグラウンドを限りなく低減する工夫（ミュオンから生じた電子の制動放射による連続バックグラウンド成分の除去など）を行った。また、サンプル周りは専用のグローブボックスを製作し、Heを充填することによりミュオンの大気吸収を抑えた。検出器はGe半導体検出器を6台同時に使用した。その結果、20㎎のCM炭素質隕石を3日半負ミュオン分析すれば、精度10％以下で炭素濃度を求めることができることが分かった。これにより探査機によって回収された小惑星リュウグウサンプルの炭素濃度測定法が確立することができた。
Hydrothermal evolution in the interior of a large hydrous planetesimal in the early solar system

Nakamura Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2018/06/29 - 2020/03/31

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In order to understand the chemical and mineralogical evolution in the interior of large hydrous planetesimals, hydrothermal experiments must be performed using carbonaceous chondrites and super-critical water. The purpose of this study is to develop the experimental procedure such hydrothermal experiments. We carried out a preliminary experiment using terrestrial serpentine and a hydrothermal experiment using carbonaceous chondrite with conditions of 600°C for temperature, 250atm for pressure, 50hours for experimental duration、and water/rock ratio of 1. The experimental product was analyzed by using synchrotron X-ray radiation for CT and XRD. The results indicate that hydrous phases in carbonaceous chondrite was decomposed and partially dehydrated. In this study, we developed the procedures of hydrothermal experiments using carbonaceous chondrites and super-critical water.
Reconstruction of atmospheric oxygen isotope composition using ancient cosmic spherules

Onoue Tetsuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

2017/04/01 - 2020/03/31

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Cosmic spherules are subspherical to spherical particles of <1 mm diameter which are produced by melting of interplanetary dust and large objects during atmospheric entry. They are known principally from the ice sheets of polar regions and Cenozoic deep-sea sediments, and a few spherules older than Mesozoic were recovered from the deep-sea deposits in the Japanese accretionary complexes. The cosmic spheres from ice sheets and deep-sea sediments contain atmospheric oxygen, and their final oxidation state is determined by the past oxygen isotopic composition of the atmosphere. Systematic studies of cosmic spherules in the antarctic ice sheets and deep-sea sediments could detect long-term changes in the past oxygen isotopic composition of the atmosphere.
Investigation on imaging of distribution of organic molecules in meteorites

Furukawa Yoshihiro, Saito Ritsumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2017/06/30 - 2019/03/31

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Distribution of organic molecules in meteorite was investigated in this study using mass spectrometers with MALDI-based ionization. Micrometer-scale distribution of mass signals have been found. Search distribution has not been found in meteorites. This distribution will help understand when and how organics in meteorites were formed. Now, further investigations are conducted to identify molecules from the mass signals.
Evolution of early solar system viewed from return sample analysis

Nakamura Tomoki, NAKASHIMA Daisuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2013/04/01 - 2018/03/31

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In order to clarify the evolution of early solar system, we performed (1) analysis of small dust particles returned by Hayabusa mission from S-type asteroid Itokawa, which showed that Itokawa experienced very strong impact that disrupted parent asteroid of Itokawa, (2) heating experiments of hydrous carbonaceous chondrites in order to understand spectral changes during hearting of C-type asteroids. The experiments were performed in vacuum and the heated samples were never exposed to atmosphere after heating and thus we obtained spectra that are free of atmospheric water.
Study on Deriving the Mineral Composition by Measuring the Visible-Infrared Reflectance Spectra of Meteorite Surfaces

Hiroi Takahiro, SASAKI Sho, NAKAMURA Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: National Institute of Polar Research

2012/04/01 - 2017/03/31

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Visible-infrared reflectance spectra of meteorites recovered from Antarctica by the National Institute of Polar Research were measured for estimating their mineral assemblages and mineral chemical compositions. Reflectance spectra of one or more spots on each chip of more than 130 meteorite chip samples of precious meteorites from Mars and the Moon, HED meteorites which mostly came from the asteroid Vesta, and carbonaceous chondrites containing water and organics were measured. By applying linear extrapolation, modified Gaussian model deconvolution, principal component analysis, etc. on those spectra, the rock types and mineral/chemical compositions could be understood, and the scheme for applying this technique to planetary missions such as Hayabusa2 has been proposed.
Quantitative estimation of water contents of C-type asteroids

Nakamura Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2014/04/01 - 2016/03/31

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Experimental heating of Murchison CM chondrite that came from hydrous C-type asteroid was carried out in order to estimate water contents of primitive asteroids. The experiments revealed changes of water contents and mineralogical characteristics of the heated Murchison samples with increasing heating temperatures. Heating at 600°C or higher results in almost complete loss of water from Murchison and thus changes hydrous mineralogy to anhydrous one. A correlation between depths of 3-μm band and water contents was found from experimental heating of Murchison and, based on this relation, the water contents of the hydrous primitive asteroids will be estimated in the near future.
Interaction among minerals, water, and organic materials in the early solar system: evolution of planetary materials and precursor materials of life

NAGAHARA Hiroko, NOGUCHI Takaaki, YABUTA Hikaru, ITOH Shoichi, TACHIBANA Shogo, OKAZAKI Ryuji, NAKAMURA Tomoki, TERADA Kentaro, EBIHARA Mitsuru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: The University of Tokyo

2010/04/01 - 2016/03/31

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Evolution of protoplanetary materials and precursor materials of life was investigated by observation of micrometeorites and physic-chemical evolutionary model of protoplanetary system. Cometary materials consisting of a mixture of ice-organic grains originated at extremely low temperature region of the solar system and mineral grains formed at high temperature have suffered a series of aqueous alteration, where organic materials changed to aromatic at first, then amorphous silicate became hydrated, and finally anhydrous minerals reacted with water to form hydrous silicates. The precursor materials of life, organics and hydrous silicates, were incorporated to small planetary bodies at the early stage of the protoplanetary disk evolution.
Ultra-high Speed Crystallization in the Primitive Solar System

TSUKAMOTO Katsuo, NAKAMURA Tomoki, NAKAMOTO Taishi, INATOMI Yuko, NAKAMURA Norihiro, KIMURA Yuki, MIRUA Hitoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2010/04/01 - 2014/03/31

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In-situ observations of crystallization from chondrule melts have successfully been conducted using gas get levitation method. It was found that hypercooling of 300-1100K is needed for the reproduction of various chondrule textures and the crystallization finishes within a few seconds. Based on the experimental data, a new kinetic model could be proposed for the chondrule texture formation.
Formation and transportation of chondrules at outer regions of protoplanetary disk

NAKAMURA Tomoki, NOGUCHI Takaaki, TUCHIYAMA Akira, NAGAO Keisuke, SEKIYA Minoru, SANO Yuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

2009/04/01 - 2014/03/31

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We have carried out mineralogical and isotopic analyses on cometary chondrules recovered by the Stardust mission. Both type-I and type-II chondrules are present in cometary chondrules. Oxygen isotopes show a wide range of composition. Some silicates in chondrules show 16O-rich composition close to the Sun, suggesting that they formed near the Sun. 26Al was not detected from plagioclase in a type-I chondrule, indicating that this cometary chondrule formed after the decay of most of 26Al and is younger than typical asteroidal chondrules.
Development of non-destructive mineral phase determination of micro amount samples by a large radius synchrotron Gandolfi camera

TANAKA Masahiko, NAKAMURA Tomoki, NOGUCHI Takaaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: National Institute for Materials Science

2009 - 2011

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A high angular resolution Gandolfi camera with the camera radius of 955mm was successfully developed for 3rd generation synchrotron X-ray source. With the Gandolfi camera we successfully observed high quality powder X-ray diffraction data from a small volume natural samples that composed of several mineral crystals. We have adopted the camera for analysis of small particles recovered from the surface of an asteroid "Itokawa" by the JAXA's space prove," Hayabusa". As the result of plagioclase thermometry using the X-ray powder diffraction data obtained by the Gandolfi camera, the crystallization temperatures of the plagioclase were determined.
Importance of amorphous silicates as source material of the solid planets and its initial evolution

TSUCHIYAMA Akira, NOGUCHI Takaaki, NAKAMURA Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Osaka University

2007 - 2011

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Based on experimental study, we have proposed a model of solid particle evolution from the universe to the solar system, where silicate minerals observed were crystallized from amorphous silicates. Stardust and Hayabusa sample analysis shows that cometary material is amorphous silicate mixed with high-temperature materials and S-type asteroid material is ordinary chondrite suffered by thermal metamorphism. Amorphous silicates with high reactivity and compositional valiety caused prompt reaction during hydrothermal metamorphism. These results showed that source material of the solar system is consistent with amorphous silicates.
宇宙風化作用を利用した新しい小惑星表面年代決定法

中村智樹

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 挑戦的萌芽研究

2008 - 2010

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本研究では小惑星の表面年代(天体そのものの形成年代ではなく、天体の現在の表面が形成された年代)を決定する新しい方法を試行する。これまでの表面年代の決定法とは全く異なる原理を用いる。具体的には、小惑星の表層から飛来した隕石の反射スペクトルと希ガス同位体分析を行い、小惑星表層の"宇宙風化作用"による反射スペクトルの変化を百万年刻みで推定する。これらのデータから、反射スペクトルの観測データがある多数の小惑星の表面年代を求める。小惑星帯の形成進化過程を解明する端緒とする。小惑星表層起源隕石であるDubrovnik普通コンドライト隕石に対し、白い部分と灰色の部分の反射スペクトル(非破壊分析)を測定した。その結果、両者に明確な違いが得られた。灰色部分を詳細にスペクトル解析し、希ガス含有量との相関を調べた。その結果、両者に明確な相関は得られなかった。原因としては、反射スペクトルを隕石刃断面で測定しているため、試料表面のみの反射スペクトルになってしまい、試料表面とその内部を包括して得られる希ガス同位体分析結果と整合性が取れないためであると考えられる。今後は、フリーズソー法を用い、太陽風照射を受けている灰色部分を微粒子単位に分解し、その反射スペクトル測定し、その試料の希ガス同位体分析を行うことにより、太陽風照射程度と反射スペクトルの赤化度の相関関係を調べる予定である。
Chondrule Formation from A Levitated Hypercooled Melt Droplet

TSUKAMTO Katsuo, NAKAMURA Tomoki, NAKAMOTO Taishi, KOBATAKE Hidekazu, NAGASHIMA Ken, YOKOYAMA Etsuro, MIURA Hitoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2007 - 2008
Shock experiments on shock metamorphism and close examination of shock scale

SEKINE Toshimori, TOMEOKA Kazushige, NAKAMURA Tomoki, YAMAGUCHI Akira, KOBAYASHI Takamichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: National Institute for Materials Science

2006 - 2008
Toward elucidation of carbonaceous matter and minerals that formed primordial solar system

NOGUCHI Takaaki, NAKAMURA Tomoki, KIMURA Makoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Ibaraki University

2005 - 2008
Evaluation of the timing of the solar nebular dissipation based on the isotope cosmochemical method

NAKAMURA Tomoki, SEKIYA Minoru, NOGUCHI Takaaki, OKAZAKI Ryuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Kyushu University

2004 - 2007

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Mineralogical and isotope study was carried out on the primitive meteorites, CV3 carbonaceous chondrites. The meteorites contain fayalite veins that formed by replacement of magnetite during extensive aqueous alteration. Radiogenic ^<53>Cr excess was detected from the fayalite veins in the Vigarano CV3 chondrite during high-resolution, high-sensitive analysis using secondary ion mass spectrometer. The formation age of the fayalite was obtained to be 4561±3 Ma based on the Mn-Cr chronometer. The age is consistent with that of some other CV3. This suggests that prevailed aqueous alteration took place in the CV3 parent body. Laser-probe noble gas analysis was performed on the sample taken from a portion close to the fayalite. The results of analysis indicate that solar noble gases are contained in the Vigarano sample. The solar gases may have been implanted prior to the formation of the fayalite vein, thus suggesting that solar nebula was dissipated at the time of 4561.3 Ma. Further analysis was planned on the portion including the fayalite veins in order to confirm the results of the present study.
静電浮遊法によるコンドリュール再現実験

中村智樹, 長尾敬介

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 萌芽研究

Institution: 九州大学

2005 - 2006

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コンドリュールとは太陽系最古の岩石であるコンドライト隕石に多数含まれる直径1mm程度の珪酸塩鉱物を主体とした球粒である。コンドリュール自体は天体が形成される以前に、原始太陽系星雲内で固体前駆物質が加熱・急冷されることで形成されたと考えられる。コンドライト隕石に多産するコンドリュールの形成・加熱機構は、太陽系の小惑星や惑星の起源を解明するという点で惑星科学の第一級の課題であるが、100年以上の論争を経ても未決着のままである。本研究では、宇宙空間の環境に限りなく近い条件でのコンドルールの再現実験を通して、コンドリュールの形成条件を解明することを目指す。本研究で採用する静電浮遊法によるコンドリュール再現実験は、圧密固結した紛体を真空中で浮遊させてレーザー加熱し溶融させるため、過去の方法のすべての問題点を解決する革新的方法である。作成した静電浮遊装置を用い、基礎実験を行った。カンラン石の小片下部に高電圧をかけて浮遊させることを試みた。3-5KeV程度で浮遊する現象が確認できたが、浮遊時の姿勢が全く安定せず、現状の装置では浮遊させたまま結晶を溶かすのは困難であることがわかった。その後、宇宙航空研究開発機構の石川毅彦博士(物性物理学)と相談した結果、石川博士が主に金属材料の電磁浮遊溶融に使用している装置を利用して、コンドリュールに近い化学組成の球粒を電磁浮遊溶融させてみることになった。試行錯誤の結果、いくつかのフォルステライトの電磁浮遊溶融に成功した。溶かして急冷した試料内部を光学顕微鏡と電子顕微鏡で観察したところ、天然のコンドリュールに似た棒状組織が再現されていることがわかった。この結果は、電磁浮遊溶融によって初めてコンドリュールに似た組織を再現したという意味で価値がある。今後は、コンドリュールの化学組成と同一の物質を電磁浮遊溶融させることにより、天然のコンドリュールの組織を完全に再現することを目指して、新しい研究展開をはかる予定である。
Quantitative estimation of the shock pressure experienced by each ordinary chondrite through lattice strain of olivine crystals

NAKAMUTA Yoshihiro, NAKAMURA Tomoki, KUWAHARA Yoshihiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Kyushu University

2004 - 2006

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We determined the correlation line between apparent strains of olivine crystals obtained by the X-ray powder diffraction method and shock pressures loaded on them with the aim of quantitatively estimating the degree of shock experienced by each meteorite. The micro-structures of crystals, from which apparent strains obtained by the X-ray method arise, were also inferred. The apparent strains of olivine crystals were determined by using small crystals taken out from polished thin sections, of about 100 μm in size, after the analysis of chemical compositions by EPMA. Micro-structures of olivine crystals, of which apparent strains were determined by the X-ray method, were observed by TEM after processed by the FIB method. On the basis of shock experiments, it was found that the apparent strains of olivine crystals increase in direct proportion with the increase of shock pressures loaded on them. The slope of the line showing the relation between the apparent strains and the shock pressures also increases gradually with the increase of the duration at a peak shock-pressure of each experiment and seems to converge at a constant value over the duration of 2 μs. Based on the apparent strains determined for the olivine crystals from meteorites and the ranges of shock pressures estimated for each shock-stage of meteorites, the correlation line applicable to meteorites is also restricted to the range where shock pressures can be estimated with 20 % of uncertainties from the apparent strains of olivine crystals. The correlation line determined by the shock experiments with 1.8μs duration is in the middle of the probable region of the correlation line obtained by the method mentioned above. Then, shock pressures experienced by each meteorite can be quantitatively estimated with 20 % of uncertainties by measuring apparent strains of olivine crystals in meteorites. The dislocation densities of olivine crystals were measured on the dark-field images taken by TEM. The logarithm of the dislocation density was found to increase in direct proportion with the increase of the apparent strain. The result reveals that apparent strain arises from dislocations formed by shock.
A study of three-dimensional structures of interplanetary dust by imaging x-ray microtomography.

TSUCHIYAMA Akira, TAKEUCHI Akihisa, UESUGI Kentaro, NOGUCHI Takaaki, NAKAMURA Tomoki, NAKANO Tsukasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Osaka University

2003 - 2005

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Three-dimensional structures of cosmic dust (interplanetary dust particles and unmelted micrometeorites) and cometary dust that was collected by NASA Stardust mission were examined using x-ray microtomography at SPring-8. Three-dimensional structures with ultra-high spatial resolution of less than 100 nm has been obtained at the end of the term of this project by imaging tomography using attenuation contrast by overcoming troubles in an optical system for enlargement of x-ray beams and a sample rotation stage. We have also examined some samples by projection CT with the spatial resolution of about 0.5 μm. Physical properties of the samples, such as porosities and densities, were obtained from the three -dimensional structures of the cosmic dust samples. Furthermore, fractal dimensions of the samples were successfully obtained. The fractal dimensions of cosmic dust which was considered to be derived from comets are significantly less than 3. This may suggest evidence of aggregation of constituent particles of the dust in the early stage of the solar system. The Stardust sample analysis, which was performed as one of the members of preliminary examination team of Stardust, revealed the three-dimensional structures of impact tracks in aerogel collectors and terminal particles in the tracks. These results gave information about the impact processes as well as basic textural information for further detailed destructive analyses. Experimental studies of infrared spectrum of cosmic dust minerals in connection with infrared astronomical observation have been also made for comprehensive research on cosmic dust. Furthermore, development of the tomography system at SPring-8 and evaluation of its performance have been done. Brightness of CT images was quantitatively formulated. By using this formulation, we have established a technique for three-dimensional element mapping of Fe and Cs using the subtraction method. The results were applied to meteorites and other terrestrial samples as well as cosmic dust samples.
A study of the carbonaceous matter in carbonaceous chondrites for evaluating the degree of alteration/thermal metamorphism in meteorite parent bodies.

KITAJIMA Fumio, NAKAMURA Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: KYUSHU UNIVERSITY

2002 - 2004

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1.Sulfur K-edge XAFS analysis of the chondrites shows the following results : (1)A typical XAFS spectrum of a CM chondrite shows the absorptions of inorganic sulfide, sulfate, and thiophenic (organic sulfur) absorptions. (2)The spectra of the CV (Allende) and CO (Ornans) chondrites lack in the sulfate and thiophenic absorptions, indicating the difference of parenrt bodies from the CM chondrites. (3)The spectra of unheated or weakly heated chondrites show relatively strong thiophenic absorption. (4)Based on the intensity of thiophenic absorption, the samples can be classified into the following groups : I Weak, corrssponds to strongly heated chondrites, II Comparable to the sulfidic absorption, corresponds to unheated or only weakly heated chondrites, III CV and CO chondrites. (5)Tagish Lake shows relatively strong thiophenic absorption, and relatively weak sulfate absorption is another characteristic of this sample. (6)The XAFS spectrum of the Muchison sample heated in laboratory lacks in the sulfate and thiophenic absorptions, suggesting such partial structure have been lost during heating. (7)Quantitative treatment of the XAFS spectra suggests that the unheated or weakly heated chondrites can be classified into two subgroups. 2.Minerals in the Sayama and the CI-ike clast in the Tsukuba chondrites were determined by X-ray diffraction using synchrotron irradiation. The clast in Tsukuba chondrite have not been heated more than 500℃, and Oxygen isotope analysis of Sayama shows that it have experienced higher temperature (more than 120℃) than the other CM chondrites such as Murchison during its alteration. 3.The laboratory simulation of aqueous alteration using Ningqiang shows that Q-gas have not been lost during alteration, but Ar-rich gas have been lost.
Pursuit of the XXX of the relationships between the origins of carbonaceous chondrites, micrometeorites, and interplnaetary dust particles.

NOGUCHI Takaaki, NAKAMURA Tomoki, YANO Hajime

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Ibaraki University

2001 - 2004

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1.We found more than 5000 micrometeorites from the fine-grained samples collected by the Japanese Antarctic Research Expedition Teams. The majority of the micrometeorites are heavily heated. Only about 1% of them experienced the least heating. We investigated the least heated micrometeorites by synchrotron radiation X-ray diffraction and TEM. Most of them contain abundant saponite as phyllosilicate. Next abundant ones contain both saponite and serpentine as phyllosilicates. Serpentine-predominant ones are revealed to be minor and comprises about 10% of the least heated ones. The most abundant type of phyllosilicate-rich micrometeorites has mineralogy similar to that of Tagish Lake meteorite. Next type resembles CI chondrites. Their parental asteroids are thought to be D-type and C-type asteroids, respectively. In other words, these data suggest that there are many micrometeorites derived from these types of asteroids. 2.We also found hypercarbonaceous anhydrous micrometeorites. These micrometeorites are composed of major carbonaceous material with relatively small amounts of anhydrous minerals such as olivine, low-Ca pyroxene, iron-nickel metal, and iron sulfides (and oxidized and weathered minerals of the metal and sulfide). Two such micrometeorites were sent to Washington University, St.Louis to search the presolar silicate grains in the meteorites. Two presolar silicate grains were discovered from tt54B397. The abundance of the presolar silicates is much higher than that of primitive meteorites. This kind of micrometeorites has an intimate relationship with hypercarbonaceous anhydrous interplanetary dust particles. The high abundance of presolar silicates suggests that this type of micrometeorites were probably derived from comets, P-type asteroids, and Kuiper belt objects. 3.We analyzed mineralogy of carbonaceous chondrite clasts in the H chondrite regolith breccias. Most of them contain saponite or saponite and serpentine as the major phyllosilicates. However, the abundance of CM-like clasts is about 30%, which is higher than that of CM-like micrometeorites.
Geochemical Study on the Oldest Halite Fossil in the Solar System

NAGAO Keisuke, KAGI Hiroyuki, TAKIGAMI Yutaka, KANEOKA Ichiro, MIURA Yayoi n., NAKAMURA Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: The University of Tokyo

2001 - 2003

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Halogens and their crystals (halide) have been investigated in Zag and other halogen containing meteorites by detecting halogen-derived noble gas isotopes ^<80>Kr, ^<82>Kr and ^<128>Xe^<129>Xe from extinct nuclide was ^<129>I also measured in these meteorites. Halide crystals are dark phase portion of the Zag meteorite. Size of most crystals are estimated to be smaller than 0.1 mm, which would be surrounded by silicates insoluble in water. Halogens are also concentrated in small materials in Yamato-74191 (L3.6) meteorite. The halogen enrichments in these meteorite are likely resulted by liquid water with high concentrations of halogens presented on their parent planetesimals. Though origin of the waters is not clear, they might have been brought through bombardment by water containing objects such as carbonaceous chondrites or comets. To study the event concerning the halogen enrichments, we constructed noble gas extraction and purification line for noble gas analysis of neutron irradiated meteorites. Modification of VG3600 noble gas mass spectrometer used for ^<40>Ar-^<39>Ar dating was carried out to improve sensitivity and stability of the mass spectrometer in the Radioisotope Center, University of Tokyo. Combining the noble gas line and the mss spectrometer, I-Xe dating of meteorites can be measurable for the first time in Japan. This method began to clarify the timing of halogen enrichment process in meteorites.
Tagish Lake炭素質コンドライト隕石の物質科学的研究

中村智樹

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究(B)

Institution: 九州大学

2001 - 2002

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Tagish Lake炭素質コンドライト隕石は2000年にカナダに落下した新しいタイプの始原阻石である。反射スペクトルの測定から、この隕石の母天体はD型小惑星であると考えられている。このタイプの小惑星は小惑星帯外縁部に存在し、対応する隕石タイプが存在しないと考えられていたものである。本研究において、Tagish Lakeの鉱物学的研究より、この隕石は明らかに母天体上での水の関与する変質を受けており、その変質の程度は高く隕石中の細粒部分はほとんど層状珪酸塩でできていることがわかった。層状珪酸塩はサポナイトが卓越しており、他の炭素質隕石の鉱物組み合わせ(サーペンテンとサポナイト)と異なる。したがって、Tagish Lakeは母天体上でこれまで見つかった隕石と異なる環境で水質変成を受けていたことが判明した。また、この隕石は鉱物組成と内部組織が異なる無数のゼノリスを含んでおり、このことはこの隕石の母天体が、角礫岩化作用を受けたことを意味する。一方、希ガス同位体比分析から、この隕石には太陽風希ガスが含まれておらず、したがって角礫岩化作用は天体表層ではなく天体集積時に起こったと推定される。これはこの隕石が集積角礫岩であることを示す(研究業績1)。また、Tagish Lakeは今までに見つかったどの隕石よりも、ダイヤモンドやSicといった先太陽系粒子の濃度が高いことがわかった。本研究より、Tagish Lake隕石は極めて始原的な物質であり、太陽系形成時の原始太陽系星雲内での小天体形成過程を記録していることが判明した。
Development of high-energy X-ray fluorescence analysis and application to the study of origin of earth and planetary materials

NAKAI Izumi, SAKURAI Yoshiharu, NAKAMAURA Tomoki, TERADA Yasuko, NINOMIYA Toshio

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tokyo University of Science

2000 - 2002

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Traditionally, the X-ray fluorescence (XRF) analysis of heavy elements is based on their L-series spectral lines. This is because the K-lines of these elements are difficult to excite by commercially available XRF spectrometers. A typical energy dispersive X-ray fluorescence spectrum of a multi-component material in energy regions of less than 20 keV is usually crowded with an overlap of the K, L, and M emission lines of the component elements. In contrast, the XRF spectrum above 20keV contains only K lines, and the spectrum becomes simple. Therefore, the use of the K-lines is ideal for the analysis of heavy elements of atomic number Z ≧45 (=Rh Kα_1=20.12 KeV). We have developed for the first time high energy XRF analysis utilizing 116keV X-rays from synchrotron radiation source of Spring-8 and found that this technique enables us to determine all heavy elements with sufficient sensitivity. The minimum detection limit was at a sub-ppm level. This technique has been successfully applied to two-dimensional analysis of zoning of heavy elements in garnet, forensic identification of automobile paints, provenance analysis of old-china wares from Kutani and Arita and the potential advantages of this technique have been elucidated. High-energy XRF analyses will become a powerful tool for analyzing environmental samples, archaeological samples, forensic samples, geochemical samples, and high-tech materials containing heavy elements such as rare earth elements. It is expected that the utilization of high-energy X-rays will open new application fields for X-ray fluorescence analyses
Studies toward Antarctic Micrometeorite classification using abundant collection

NOGAMI Ken-ichi, IMAE Naoya, NOGUCHI Takaaki, TERADA Kentaro, NAKAMURA Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: National Institute of Polar Research

1999 - 2002

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We studied abundant Antarctic Micrometeorites collected by JARE-37, 38, 39 and 41, where JARE is Japanese Antarctic Research Expedition. Samples from JARE-37 and 38 were recovered from water tank for life in the Dome Fuji Station, those from JARE-39 from the Yamato meteorite bare icefield, and those from JARE-41 from the Tottuki bare ice area. Especially, important results were obtained from the study focused on the hydrously altered minerals. Generally, most of cosmic dust consists of hydrously altered minerals (more than 50%). On the other hand, meteorites consisting of hydrous minerals are limited to carbonaceous chondrites (〜1%). This mode of difference suggests that hydrous minerals in space fall as mostly cosmic dust, being ascribed from the fragile substance of the material. We found that recent fell Tagish Lake meteorite, which is a new type of hydrously altered carbonaceous chondrite, has a close relationship with the Antarctic micrometeorites. In the 4th year of our research period, we summarized our study and compiled our 18 published papers, list of 41 abstracts and catalog of Japanese Antarctic Micrometeorites with more than 300 pages.
彗星起源惑星間塵の物質科学的研究

中村智樹

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 九州大学

1999 - 2000

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南極氷床で捕獲された多数の宇宙塵について、非破壊および破壊分析を組み合わせて行い、宇宙塵の起源と進化を研究した。電子顕微鏡での化学分析の結果、これらの宇宙塵は試料一粒でほぼ太陽化学組成を示すことがわかった。したがって、これらの塵は太陽系形成時に化学的に未分化な物質として形成されたと考えられる。宇宙塵一粒ごとのX線回折実験の結果、鉱物学的には二種類の宇宙塵が存在し、無水鉱物からなるものと含水鉱物からなるものであることがわかった(研究業績1)。しかしながら、透過型電子顕微鏡による観察によると、無水鉱物からなる試料のうちの多くが、含水鉱物が熱分解してできたものであることがわかった(研究業績5)。このことは宇宙塵が宇宙空間から大気圏突入する際に摩擦熱の影響を大きく受けたためであると推測される。一方、一粒ごとおよび多粒子を用いた希ガス分析の結果、これらの宇宙塵は宇宙空間で、宇宙塵母天体の深部に存在し、その後小さな塵として宇宙空間に放出され、大部分は100万年以内に地球に到達したものであることがわかった(研究業績4,6)。以上のことから、宇宙塵の多くは太陽系初期に形成された天体の一部で、太陽系の歴史の大部分をその天体の奥深くで過ごし、最近になって塵としてその天体から放出され、地球に飛来し、その際大気圏突入時の熱の影響をさまざまな程度に受け化学的に変化し、現在の状態になったと考えられる。母天体表層で長い間宇宙線照射を受けた証拠がないことから、宇宙塵の母天体表層は非常に活発である(表面が定常的に入れ替わっている)と推測され、彗星がその母天体であるとすることと矛盾しないことがわかった。
Cosmochemical Study of Halogens Based on Halogen-derived Noble Gas Isotopes

NAGAO Keisuke, NAKAMURA Yayoi, NAKAMURA Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: The University of Tokyo

1999 - 2000

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We have observed very high concentrations of Cl, Br and I in Yamato-74191 and in CAIs of Allende(CV3) chondrite. Because halogens are generally thought to have behaved as volatile elements when solid condensates were produced in solar nebula, mechanism to produce the observed high concentrations of halogens in CAIs is difficult to understand. This is due to a lack of knowledge about the cosmochemical behavior of halogens. Laser microprobe noble gas analysis was applied to Allende meteorite traversing the CAI and matrix with a space resolution of about 150μm. The high concentrations of ^<129>Xe show good correlation with the chlorine concentrations determined with EPMA analysis. ^<80>Kr/^<84>Kr and ^<128>Xe/^<132>Xe ratios are also high in the measured portions with high ^<129>Xe/^<132>Xe ratios. The ^<80>Kr and ^<128>Xe can be produced by neutron capture on ^<79>Br and ^<127>I, respectively, in space. The present results show that halogens have penetrated into the CAIs from outside through the disordered boundary of CAI, when aqueous alteration produced sodalite inside the CAIs. Since we could not find halogen-derived noble gases in surrounding matrix materials, the halogen-rich materials in CAIs must have been produced in the solar nebular, and not in parent body after embedded in matrices. The high concentrations of ^<129>Xe in sodalite-rich materials indicate that the aqueous alteration must occur at the very early stage of solar system when abundant ^<129>I was still alive.
Study on the initial states of the solar system by measuring microdistribution of noble gases in meteorites

TAKAOKA Nobuo, NAKAMURA Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: KYUSHU UNIVERSITY

1997 - 1999

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In order to determine physico-chemical process and condition to affect the evolution of materials in the early solar system, noble-gas microdistribution was measured by a laser microprobe technique and was compared to the meteorite texture. Trapped gases in carbonaceous chondrites reside mainly in chondrule rims. Solar gas was found in comminuted parts but not in primary accreted rocks, indicating that the material density of the solar nebula was so high that the solar wind did not reach the formation region of chondrule rims. Gas-loss from Allende was determined by artificially applying impact-shocks of 30 to 70 GPa to it. At 70 GPa shock, part of rock melted and 70% of Q-Gas was lost, whereas HL-gas that was trapped in presolar diamond was retained without loss. Gas-loss-following dehydration of phyllosilicate minerals was studied as well to find physico-chemical conditions in the early solar nebula. Gas concentration in dehydrated carbonaceous chondrites is constrained by heating temperature and time as well as graphitization of organic carbon. Cosmic dusts including IDP, Antarctic micrometeorites and magnetic deep-sea spherules were analyzed for noble-gas, trace element and mineral composition. Determinations of mineral compositions of IDP and micrometeorites and trace element abundance for magnetic spherules were carried out using high luminosity of synchrotron radiation.
彗星起源惑星間塵の鉱物学

中村智樹

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 九州大学

1997 - 1998

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木星族短周期型賛星から飛来したと考えられる惑星間塵の放射光を用いたX線回折実験を行った。用いた惑星間塵試料は、Schawassmann-Wachmann第3(SW)彗星起源のもので、この彗星の軌道を地球が通過した際に、彗星から掃き出された塵を成層圏で飛行機にて集塵したものである。これらの惑星間塵は20ミクロン程度の細粒粒子であるが、一粒でsolarabundanceに近い化学組成を示す。このことは、惑星間塵一粒が極細粒の固体微粒子の集合体であることを考えあわせると、惑星間塵が形成された太陽系領域では、固体微粒子が非常に均質に混合されていたことを示す。本研究ではガンドルフィーカメラを用いシンクロトロン放射光(高エネルギー加速器研究機構)の強いX線を利用して、惑星間塵一粒づつのX線回折実験を行い、惑星間塵一粒の鉱物組成を明らかにした。シンクロトロン放射光を分光結晶とサジタルフォーカスを用い単色化し、惑星間塵に照射した。惑星間塵の鉱物組成は存在度の多い順に、鉄を含むフォルステライト、ピロータイト、トロイライト、ダイオプサイト、カマサイトであり、含水鉱物は検出されなかった。本研究で分析した惑星間塵には含水鉱物まったく含まれていなかったので、SW彗星に含水鉱物が存在している可能性は低い。これは彗星核が極低温であるために(150K以下)、氷が溶けずに水質変成が彗星内で進行しなかったことを示唆する。本研究で求めた惑星間塵の鉱物組成は、熱力学的に計算された原始太陽系周縁部の氷に富む塵の層の鉱物組成に定性的に類似している。したがって、これらの惑星間塵は、太陽系形成期の太陽系周縁部の塵の鉱物組成を保存している可能性があることがわかった。
Noble-gas mass-spectrometer of high performance

TAKAOKA Nobuo, NAKAMURA Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Developmental Scientific Research (B)

Institution: KYUSHU UNIVERSITY

1994 - 1995

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Since noble gases are chemically inert and similar in their chemical properties, we may grasp them as a chemical element with 23 isotopes, in cosmo-and geo-chemistry. In addition, there are noble gas isotopes produced from radioactive parent nuclides of different lifetime. These enable us to apply noble gases to problems concerning the evolution of the earth and planetary system. To know isotope signatures and trapping sites of meteoritic noble gases simultaneously, we analyze meteorite samples with a laser-micro-probe. For measuring noble gases of 10^4 atoms or less, evolved with the laser-micro-probe, we made a mass spectrometer of QQQH field configuration. The spectrometer has low magnification and three-dimensional focusing. We investgated sensitivity, mass resolution and background (vacuum) of the spectrometer. We obtained a good sensitivity but there remain some problems to be solved in mass resolution and background spectrum.
コンドライト隕石の物質科学と初期太陽系進化 Competitive
Origin and formation processes of cosmic dust Competitive
Noble gases in chondrites Competitive
宇宙塵の起源と形成過程 Competitive
コンドライト中の希ガス Competitive
Evolution of the early solar system based on isotope signatures of chondritic meteorites Competitive

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