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The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes

2019; American Association for the Advancement of Science; Volume: 364; Issue: 6437 Linguagem: Inglês

10.1126/science.aaw0422

1095-9203

Seiji Sugita, Rie Honda, Tomokatsu Morota, Shingo Kameda, Hirotaka Sawada, Eri Tatsumi, Manabu Yamada, Chikatoshi Honda, Y. Yokota, Toru Kouyama, Naoya Sakatani, Kazunori Ogawa, Hidehiko Suzuki, Tatsuaki Okada, Noriyuki Namiki, Satoshi Tanaka, Y. Iijima, Kazuo Yoshioka, M. Hayakawa, Y. Cho, M. Matsuoka, Naru Hirata, N. Hirata, Hideaki Miyamoto, D. Domingue, Masatoshi Hirabayashi, T. Nakamura, T. Hiroi, T. Michikami, Patrick Michel, R.-L. Ballouz, O. S. Barnouin, C. M. Ernst, Stefan Schröder, Hiroshi Kikuchi, Ryodo Hemmi, G. Komatsu, T. Fukuhara, Makoto Taguchi, T. Arai, H. Senshu, H. Demura, Yutaka Ogawa, Yuri Shimaki, Tomohiko Sekiguchi, Thomas Müller, A. Hagermann, Takahide Mizuno, Hirotomo Noda, Koji Matsumoto, Ryuhei Yamada, Yoshiaki Ishihara, Hitoshi Ikeda, H. Araki, Keiko Yamamoto, Shinsuke Abe, Fumi Yoshida, A. Higuchi, S. Sasaki, Shoko Oshigami, S. Tsuruta, K. Asari, Seiichi Tazawa, Makoto Shizugami, Jun Kimura, Toshimichi Otsubo, Hikaru Yabuta, Sunao Hasegawa, Masateru Ishiguro, Shogo Tachibana, E. E. Palmer, R. W. Gaskell, L. Le Corre, R. Jaumann, Katharina A. Otto, Nicole Schmitz, P. A. Abell, M. A. Barucci, M. E. Zolensky, F. Vilas, Florian Thuillet, C. Sugimoto, Naofumi Takaki, Y. Suzuki, Hiroaki Kamiyoshihara, Masato Okada, Kenji Nagata, M. Fujimoto, Makoto Yoshikawa, Yukio Yamamoto, K. Shirai, Rina Noguchi, Naoko Ogawa, Fuyuto Terui, Shota Kikuchi, Tomohiro Yamaguchi, Yusuke Oki, Yuki Takao, Hiroshi Takeuchi, Go Ono, Yuya Mimasu, Kent Yoshikawa, T. Takahashi, Yuto Takei, Atsushi Fujii, Chikako Hirose, Satoru Nakazawa, S Hosoda, O. Mori, T. Shimada, Stefania Soldini, Takahiro Iwata, Masanao Abe, Hajime Yano, Ryudo Tsukizaki, Masanobu Ozaki, Kazutaka Nishiyama, Takanao Saiki, Sei‐ichiro Watanabe, Yuichi Tsuda,

Isotope Analysis in Ecology

The near-Earth carbonaceous asteroid 162173 Ryugu is thought to have been produced from a parent body that contained water ice and organic molecules. The Hayabusa2 spacecraft has obtained global multicolor images of Ryugu. Geomorphological features present include a circum-equatorial ridge, east-west dichotomy, high boulder abundances across the entire surface, and impact craters. Age estimates from the craters indicate a resurfacing age of [Formula: see text] years for the top 1-meter layer. Ryugu is among the darkest known bodies in the Solar System. The high abundance and spectral properties of boulders are consistent with moderately dehydrated materials, analogous to thermally metamorphosed meteorites found on Earth. The general uniformity in color across Ryugu's surface supports partial dehydration due to internal heating of the asteroid's parent body.