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

被引：470

作者：

Watanabe, S. ^{[1
,2
]}

Hirabayashi, M. ^{[3
]}

Hirata, N. ^{[4
]}

Hirata, Na. ^{[5
]}

Noguchi, R. ^{[2
]}

Shimaki, Y. ^{[2
]}

Ikeda, H. ^{[6
]}

Tatsumi, E. ^{[7
]}

Yoshikawa, M. ^{[2
,8
]}

Kikuchi, S. ^{[2
]}

Yabuta, H. ^{[9
]}

Nakamura, T. ^{[10
]}

Tachibana, S. ^{[2
,7
]}

Ishihara, Y. ^{[2
,31
]}

Morota, T. ^{[1
]}

Kitazato, K. ^{[4
]}

Sakatani, N. ^{[2
]}

Matsumoto, K. ^{[8
,11
]}

Wada, K. ^{[12
]}

Senshu, H. ^{[12
]}

Honda, C. ^{[4
]}

Michikami, T. ^{[13
]}

Takeuchi, H. ^{[2
,8
]}

Kouyama, T. ^{[14
]}

Honda, R. ^{[15
]}

Kameda, S. ^{[16
]}

Fuse, T. ^{[17
]}

Miyamoto, H. ^{[7
]}

Komatsu, G. ^{[12
,18
]}

Sugita, S. ^{[7
]}

Okada, T. ^{[2
,7
]}

Namiki, N. ^{[8
,11
]}

Arakawa, M. ^{[5
]}

Ishiguro, M. ^{[19
]}

Abe, M. ^{[2
,8
]}

Gaskell, R. ^{[20
]}

Palmer, E. ^{[20
]}

Barnouin, O. S. ^{[21
]}

Michel, P. ^{[22
]}

French, A. S. ^{[23
]}

McMahon, J. W. ^{[23
]}

Scheeres, D. J. ^{[23
]}

Abell, P. A. ^{[24
]}

Yamamoto, Y. ^{[2
,8
]}

Tanaka, S. ^{[2
,5
,8
]}

Shirai, K. ^{[2
]}

Matsuoka, M. ^{[2
]}

Yamada, M. ^{[12
]}

Yokota, Y. ^{[2
,15
]}

Suzuki, H. ^{[25
]}

机构：

[1] Nagoya Univ, Nagoya, Aichi 4648601, Japan

[2] Japan Aerosp Explorat Agcy JAXA, ISAS, Sagamihara, Kanagawa 2525210, Japan

[3] Auburn Univ, Auburn, AL 36849 USA

[4] Univ Aizu, Aizu Wakamatsu, Fukushima 9658580, Japan

[5] Kobe Univ, Kobe, Hyogo 6578501, Japan

[6] JAXA, Res & Dev Directorate, Sagamihara, Kanagawa 2525210, Japan

[7] Univ Tokyo, Tokyo 1130033, Japan

[8] Grad Univ Adv Studies, SOKENDAI, Hayama 2400193, Japan

[9] Hiroshima Univ, Higashihiroshima 7398526, Japan

[10] Tohoku Univ, Sendai, Miyagi 9808578, Japan

[11] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[12] Chiba Inst Technol, Narashino, Chiba 2750016, Japan

[13] Kindai Univ, Higashihiroshima 7392116, Japan

[14] Natl Inst Adv Ind Sci & Technol, Tokyo 1350064, Japan

[15] Kochi Univ, Kochi 7808520, Japan

[16] Rikkyo Univ, Tokyo 1718501, Japan

[17] Natl Inst Informat & Commun Technol, Kashima 3148501, Japan

[18] Univ Annunzio, I-65127 Pescara, Italy

[19] Seoul Natl Univ, Seoul 08826, South Korea

[20] Planetary Sci Inst, Tucson, AZ 85710 USA

[21] Johns Hopkins Univ, Appl Phys Lab, Johns Hopkins Rd, Laurel, MD 20707 USA

[22] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, F-06304 Nice, France

[23] Univ Colorado, Boulder, CO 80309 USA

[24] NASA, Johnson Space Ctr, Houston, TX 77058 USA

[25] Meiji Univ, Kawasaki, Kanagawa 2148571, Japan

[26] DLR German Aerosp Ctr, Inst Space Syst, D-28359 Bremen, Germany

[27] CNES, F-31401 Toulouse, France

[28] Inst Planetary Res, DLR, D-12489 Berlin, Germany

[29] Inst Astrophys Spatiale, F-91405 Orsay, France

[30] Micrograv User Support Ctr, DLR, D-51147 Cologne, Germany

[31] Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan

[32] Mitsubishi Electr Corp, Kamakura, Kanagawa 2478520, Japan

来源：

SCIENCE | 2019年 / 364卷 / 6437期

基金：

日本学术振兴会;

关键词：

SURFACE; SAMPLES; CAMERA; CALIBRATION; ITOKAWA; MISSION; ONBOARD; ORIGIN; RADAR; ONC;

D O I：

10.1126/science.aav8032

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：268 / +

页数：34

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