Portal de Periódicos da CAPES

Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu—A spinning top–shaped rubble pile

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

10.1126/science.aav8032

1095-9203

Sei‐ichiro Watanabe, Masatoshi Hirabayashi, Naru Hirata, N. Hirata, Rina Noguchi, Yuri Shimaki, H. Ikeda, Eri Tatsumi, Makoto Yoshikawa, Shota Kikuchi, Hikaru Yabuta, T. Nakamura, Shogo Tachibana, Yoshiaki Ishihara, Tomokatsu Morota, K. Kitazato, N. Sakatani, Koji Matsumoto, Koji Wada, Hiroki Senshu, Chikatoshi Honda, T. Michikami, Hiroshi Takeuchi, Toru Kouyama, Rie Honda, Shingo Kameda, T. Fuse, Hideaki Miyamoto, G. Komatsu, Seiji Sugita, Tatsuaki Okada, Noriyuki Namiki, Masahiko Arakawa, Masateru Ishiguro, Masanao Abe, R. W. Gaskell, E. Palmer, O. S. Barnouin, Patrick Michel, A. S. French, Jay W. McMahon, Daniel J. Scheeres, P. A. Abell, Yukio Yamamoto, S. Tanaka, K. Shirai, M. Matsuoka, Manabu Yamada, Y. Yokota, Hidehiko Suzuki, Kazuo Yoshioka, Yuichiro Cho, S. Tanaka, N. Nishikawa, T. Sugiyama, Hiroshi Kikuchi, Ryodo Hemmi, Tomohiro Yamaguchi, Naoko Ogawa, Go Ono, Yuya Mimasu, Kent Yoshikawa, T. Takahashi, Yuto Takei, Atsushi Fujii, Chikako Hirose, Takahiro Iwata, Masahiko Hayakawa, S Hosoda, Osamu Mori, H. Sawada, T. Shimada, Stefania Soldini, Hajime Yano, Ryudo Tsukizaki, Masanobu Ozaki, Y. Iijima, Kazunori Ogawa, M. Fujimoto, Tra‐Mi Ho, A. Moussi, R. Jaumann, Jean‐Pierre Bibring, C. Krause, Fuyuto Terui, Takanao Saiki, Satoru Nakazawa, Yuichi Tsuda,

Geology and Paleoclimatology Research

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 grams per cubic centimeter, 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 from having 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 identified a suitable sample collection site on the equatorial ridge.