Three-dimensional structure of hayabusa samples: Origin and evolution of itokawa regolith

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

doi:10.1126/science.1207807

Three-dimensional structure of hayabusa samples: Origin and evolution of itokawa regolith

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. IrelandFumio 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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

239 Citations (Scopus)

Abstract

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 formmuch of the regolith particle, and that seismic-induced grain motion in the smooth terrain abrades them over time.

Original language	English
Pages (from-to)	1125-1128
Number of pages	4
Journal	Science
Volume	333
Issue number	6046
DOIs	https://doi.org/10.1126/science.1207807
Publication status	Published - 2011 Aug 26
Externally published	Yes

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Tsuchiyama, A., Uesugi, M., Matsushima, T., Michikami, T., Kadono, T., Nakamura, T., Uesugi, K., Nakano, T., Sandford, S. A., Noguchi, R., Matsumoto, T., Matsuno, J., Nagano, T., Imai, Y., Takeuchi, A., Suzuki, Y., Ogami, T., Katagiri, J., Ebihara, M., ... Kawaguchi, J. (2011). Three-dimensional structure of hayabusa samples: Origin and evolution of itokawa regolith. Science, 333(6046), 1125-1128. https://doi.org/10.1126/science.1207807

Tsuchiyama, A, Uesugi, M, Matsushima, T, Michikami, T, Kadono, T, Nakamura, T, Uesugi, K, Nakano, T, Sandford, SA, Noguchi, R, Matsumoto, T, Matsuno, J, Nagano, T, Imai, Y, Takeuchi, A, Suzuki, Y, Ogami, T, Katagiri, J, Ebihara, M, Ireland, TR, Kitajima, F, Nagao, K, Naraoka, H, Noguchi, T, Okazaki, R, Yurimoto, H, Zolensky, ME, Mukai, T, Abe, M, Yada, T, Fujimura, A, Yoshikawa, M & Kawaguchi, J 2011, 'Three-dimensional structure of hayabusa samples: Origin and evolution of itokawa regolith', Science, vol. 333, no. 6046, pp. 1125-1128. https://doi.org/10.1126/science.1207807

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abstract = "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 formmuch of the regolith particle, and that seismic-induced grain motion in the smooth terrain abrades them over time.",

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AU - Michikami, Tatsuhiro

AU - Kadono, Toshihiko

AU - Nakamura, Tomoki

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AU - Nakano, Tsukasa

AU - Sandford, Scott A.

AU - Noguchi, Ryo

AU - Matsumoto, Toru

AU - Matsuno, Junya

AU - Nagano, Takashi

AU - Imai, Yuta

AU - Takeuchi, Akihisa

AU - Suzuki, Yoshio

AU - Ogami, Toshihiro

AU - Katagiri, Jun

AU - Ebihara, Mitsuru

AU - Ireland, Trevor R.

AU - Kitajima, Fumio

AU - Nagao, Keisuke

AU - Naraoka, Hiroshi

AU - Noguchi, Takaaki

AU - Okazaki, Ryuji

AU - Yurimoto, Hisayoshi

AU - Zolensky, Michael E.

AU - Mukai, Toshifumi

AU - Abe, Masanao

AU - Yada, Toru

AU - Fujimura, Akio

AU - Yoshikawa, Makoto

AU - Kawaguchi, Junichiro

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Three-dimensional structure of hayabusa samples: Origin and evolution of itokawa regolith

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