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

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ID: 106556
2020
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Abstract
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.
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morota2020samplescience Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors 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;Hirata, N;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;
Journal science (new york, ny)
Year 2020
DOI
10.1126/science.aaz6306
URL
Keywords
atomic force microscopy image pixel hysteresis model measurement accuracy

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