Sample collection from asteroid (162173) Ryugu by Hayabusa2: Implications for surface evolution

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 co...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2020-05, Vol.368 (6491), p.654-659
Hauptverfasser:	Morota, T, Sugita, S, Cho, Y, Kanamaru, M, Tatsumi, E, Sakatani, N, Honda, R, Hirata, N, Kikuchi, H, Yamada, M, Yokota, Y, Kameda, S, Matsuoka, M, Sawada, H, Honda, C, Kouyama, T, Ogawa, K, Suzuki, H, Yoshioka, K, Hayakawa, M, Hirabayashi, M, Miyamoto, H, Michikami, T, Hiroi, T, Hemmi, R, Barnouin, O S, Ernst, C M, Kitazato, K, Nakamura, T, Riu, L, Senshu, H, Kobayashi, H, Sasaki, S, Komatsu, G, Tanabe, N, Fujii, Y, Irie, T, Suemitsu, M, Takaki, N, Sugimoto, C, Yumoto, K, Ishida, M, Kato, H, Moroi, K, Domingue, D, Michel, P, Pilorget, C, Iwata, T, Abe, M, Ohtake, M, Nakauchi, Y, Tsumura, K, Yabuta, H, Ishihara, Y, Noguchi, R, Matsumoto, K, Miura, A, Namiki, N, Tachibana, S, Arakawa, M, Ikeda, H, Wada, K, Mizuno, T, Hirose, C, Hosoda, S, Mori, O, Shimada, T, Soldini, S, Tsukizaki, R, Yano, H, Ozaki, M, Takeuchi, H, Yamamoto, Y, Okada, T, Shimaki, Y, Shirai, K, Iijima, Y, Noda, H, Kikuchi, S, Yamaguchi, T, Ogawa, N, Ono, G, Mimasu, Y, Yoshikawa, K, Takahashi, T, Takei, Y, Fujii, A, Nakazawa, S, Terui, F, Tanaka, S, Yoshikawa, M, Saiki, T, Watanabe, S, Tsuda, Y
Format:	Artikel
Sprache:	eng
Schlagworte:	Asteroids Astrophysics Collection Craters Earth and Planetary Astrophysics Evolution Heat Japanese spacecraft Minerals Morphology Near-Earth Objects Organic chemistry Sciences of the Universe Solar heating Spacecraft Stratigraphy Thrusters Touchdown
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Beschreibung
Zusammenfassung:	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.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.aaz6306