The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy

被引：302

作者：

Kitazato, K. ^{[1
]}

Milliken, R. E. ^{[2
]}

Iwata, T. ^{[3
,4
]}

Abe, M. ^{[3
,4
]}

Ohtake, M. ^{[3
,4
]}

Matsuura, S. ^{[5
]}

Arai, T. ^{[6
,8
]}

Nakauchi, Y. ^{[3
]}

Nakamura, T. ^{[7
]}

Matsuoka, M. ^{[3
]}

Senshu, H. ^{[8
]}

Hirata, N. ^{[1
,26
]}

Hiroi, T. ^{[2
]}

Pilorget, C. ^{[9
]}

Brunetto, R. ^{[9
]}

Poulet, F. ^{[8
]}

Riu, L. ^{[3
]}

Bibring, J. -P. ^{[9
]}

Takir, D. ^{[10
]}

Domingue, D. L. ^{[11
]}

Vilas, F. ^{[11
]}

Barucci, M. A. ^{[12
]}

Perna, D. ^{[12
,13
]}

Palomba, E. ^{[14
]}

Galiano, A. ^{[14
]}

Tsumura, K. ^{[7
,15
]}

Osawa, T. ^{[16
]}

Komatsu, M. ^{[4
]}

Nakato, A. ^{[3
]}

Arai, T. ^{[6
,8
]}

Takato, N. ^{[4
,17
]}

Matsunaga, T. ^{[18
]}

Takagi, Y. ^{[19
]}

Matsumoto, K. ^{[4
,17
]}

Kouyama, T. ^{[20
]}

Yokota, Y. ^{[3
,21
]}

Tatsumi, E. ^{[22
]}

Sakatani, N. ^{[3
]}

Yamamoto, Y. ^{[3
,4
]}

Okada, T. ^{[3
,22
]}

Sugita, S. ^{[22
]}

Honda, R. ^{[21
]}

Morota, T. ^{[23
]}

Kameda, S. ^{[24
]}

Sawada, H. ^{[3
]}

Honda, C. ^{[1
]}

Yamada, M. ^{[8
]}

Suzuki, H. ^{[25
]}

Yoshioka, K. ^{[22
]}

Hayakawa, M. ^{[3
]}

机构：

[1] Univ Aizu, Fukushima, Japan

[2] Brown Univ, Providence, RI 02912 USA

[3] Japan Aerosp Explorat Agcy JAXA, ISAS, Sagamihara, Kanagawa, Japan

[4] Grad Univ Adv Studies SOKENDAI, Kanagawa, Japan

[5] Kwansei Gakuin Univ, Nishinomiya, Hyogo, Japan

[6] Ashikaga Univ, Ashikaga, Tochigi, Japan

[7] Tohoku Univ, Sendai, Miyagi, Japan

[8] Chiba Inst Technol, Chiba, Japan

[9] Univ Paris Sud, Inst Astrophys Spatial, Orsay, France

[10] NASA, Astromat Res & Explorat Sci, Johnson Space Ctr, Houston, TX USA

[11] Planetary Sci Inst, Tucson, AZ USA

[12] Observ Paris, LESIA, Meudon, France

[13] Ist Nazl Astrofis INAF, Osserv Astronomico Roma, Osservatorio Astron Roma, Monte Porzio Catone, Italy

[14] INAF, Ist Astrofis Planetol Spaziali, Rome, Italy

[15] Tokyo City Univ, Tokyo, Japan

[16] Japan Atom Energy Agcy, Ibaraki, Japan

[17] Natl Astron Observ Japan, Tokyo, Japan

[18] Natl Inst Environm Studies, Ibaraki, Japan

[19] Aichi Toho Univ, Nagoya, Aichi, Japan

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

[21] Kochi Univ, Kochi, Japan

[22] Univ Tokyo, Tokyo, Japan

[23] Nagoya Univ, Nagoya, Aichi, Japan

[24] Rikkyo Univ, Tokyo, Japan

[25] Meiji Univ, Tokyo, Japan

[26] Kobe Univ, Kobe, Hyogo, Japan

[27] Natl Inst Polar Res, Tokyo, Japan

[28] Mitsubishi Electr Corp, Kanagawa, Japan

来源：

SCIENCE | 2019年 / 364卷 / 6437期

基金：

欧盟地平线“2020”;

关键词：

SPECTRAL REFLECTANCE PROPERTIES; CARBONACEOUS CHONDRITES; TARGETS; MISSION; ORGANICS; ICE; CM;

D O I：

10.1126/science.aav7432

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 near-Earth asteroid 162173 Ryugu, the target of the Hayabusa2 sample-return mission, is thought to be a primitive carbonaceous object. We report reflectance spectra of Ryugu's surface acquired with the Near-Infrared Spectrometer (NIRS3) on Hayabusa2, to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 micrometers was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, which is consistent with Ryugu being a compositionally homogeneous rubble-pile object generated from impact fragments of an undifferentiated aqueously altered parent body.

引用

页码：272 / +

页数：19

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