Evidence of global space weathering by solar wind on asteroid 162173 Ryugu

被引：10

作者：

Hiroi, T. ^{[1
]}

Milliken, R. E. ^{[1
]}

Robertson, K. M. ^{[1
]}

Schultz, C. D. ^{[1
]}

Amano, K. ^{[2
]}

Nakamura, T. ^{[2
]}

Yurimoto, H. ^{[3
]}

Noguchi, T. ^{[4
]}

Okazaki, R. ^{[5
]}

Naraoka, H. ^{[5
]}

Yabuta, H. ^{[6
]}

Sakamoto, K. ^{[7
]}

Yada, T. ^{[7
]}

Nishimura, M. ^{[7
]}

Nakato, A. ^{[7
]}

Miyazaki, A. ^{[7
]}

Yogata, K. ^{[7
]}

Abe, M. ^{[7
]}

Okada, T. ^{[7
]}

Usui, T. ^{[7
]}

Yoshikawa, M. ^{[7
]}

Saiki, T. ^{[7
]}

Tanaka, S. ^{[7
]}

Nakazawa, S. ^{[7
]}

Yokota, Y. ^{[7
]}

Tatsumi, E. ^{[7
]}

Tsuda, Y. ^{[7
]}

Tachibana, S. ^{[8
]}

Fuyuto, T. ^{[9
]}

Watanabe, S. ^{[10
]}

Sasaki, S. ^{[11
]}

Kaiden, H. ^{[12
,13
]}

Kitazato, K. ^{[14
]}

Matsuoka, M. ^{[15
]}

机构：

[1] Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA

[2] Tohoku Univ, Dept Earth Sci, Sendai, Miyagi 9808578, Japan

[3] Hokkaido Univ, Dept Earth & Planetary Sci, Sapporo, Hokkaido 0600810, Japan

[4] Kyoto Univ, Div Earth & Planetary Sci, Kyoto 6068502, Japan

[5] Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka 8190395, Japan

[6] Hiroshima Univ Higashi Hiroshima, Dept Earth & Planetary Syst Sci, Hiroshima 7398526, Japan

[7] Japan Aerosp Explorat Agcy JAXA, Inst Space & Astronaut Sci ISAS, Sagamihara, Kanagawa 2525210, Japan

[8] Univ Tokyo, Dept Earth & Planetary Sci, Tokyo 1130033, Japan

[9] Kanagawa Inst Technol, Dept Mech Engn, Atsugi, Kanagawa 2430292, Japan

[10] Nagoya Univ, Dept Earth & Environm Sci, Nagoya, Aichi 4648601, Japan

[11] Osaka Univ, Dept Earth & Space Sci, Osaka 5600043, Japan

[12] Natl Inst Polar Res NIPR, Geosci Grp, Tachikawa, Tokyo 1908518, Japan

[13] SOKENDAI, Grad Univ Adv Studies, Tachikawa, Tokyo 1908518, Japan

[14] Univ Aizu, Dept Comp Sci & Engn, Div Informat Syst, Aizu Wakamatsu, Fukushima 9658580, Japan

[15] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058567, Japan

来源：

ICARUS | 2023年 / 406卷

关键词：

Asteroid; Ryugu; Meteorite; Reflectance spectroscopy; Space weathering;

D O I：

10.1016/j.icarus.2023.115755

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Reflectance spectra (0.3-4 mu m) of powder samples of the third largest stone C0002 returned from the asteroid Ryugu by JAXA Hayabusa2 mission were measured and compared with proximity observation data taken by the Optical Navigation Camera - Telescopic (ONC-T) and the Near-Infrared Spectrometer (NIRS3) onboard the Hayabusa2 spacecraft. Although the characteristics of the 2.7 mu m absorption band due to structural hydroxyl of the Ryugu powder samples are consistent with CI1 chondrite meteorites, NIRS3 spectra of the global surface of Ryugu exhibit a wavelength shift of +6 nm in the 2.7 mu m absorption band center in comparison with those of both the powder samples and an artificial crater on the asteroid formed by the Small Carry-on Impactor (SCI). This is consistent with effects of solar wind-induced space weathering being present across the global surface of asteroid Ryugu. The darkness of the Ryugu surface in comparison with the returned samples and an upturn in reflectance observed in the average ONC-T spectrum at ultraviolet wavelengths may also be due to space weathering.

引用

页数：8

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