Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu

被引：210

作者：

Yada, Toru ^{[1
]}

Abe, Masanao ^{[1
,2
]}

Okada, Tatsuaki ^{[1
,3
]}

Nakato, Aiko ^{[1
]}

Yogata, Kasumi ^{[1
]}

Miyazaki, Akiko ^{[1
]}

Hatakeda, Kentaro ^{[1
,4
]}

Kumagai, Kazuya ^{[1
,4
]}

Nishimura, Masahiro ^{[1
]}

Hitomi, Yuya ^{[1
,4
]}

Soejima, Hiromichi ^{[1
,4
]}

Yoshitake, Miwa ^{[1
,35
]}

Iwamae, Ayako ^{[1
,4
,36
]}

Furuya, Shizuho ^{[1
,3
]}

Uesugi, Masayuki ^{[1
,5
]}

Karouji, Yuzuru ^{[1
,6
]}

Usui, Tomohiro ^{[1
]}

Hayashi, Tasuku ^{[1
]}

Yamamoto, Daiki ^{[1
]}

Fukai, Ryota ^{[1
]}

Sugita, Seiji ^{[3
,7
]}

Cho, Yuichiro ^{[3
]}

Yumoto, Koki ^{[3
]}

Yabe, Yuna ^{[3
]}

Bibring, Jean-Pierre ^{[8
]}

Pilorget, Cedric ^{[8
]}

Hamm, Vincent ^{[8
]}

Brunetto, Rosario ^{[8
]}

Riu, Lucie ^{[1
,8
]}

Lourit, Lionel ^{[8
]}

Loizeau, Damien ^{[8
]}

Lequertier, Guillaume ^{[8
]}

Moussi-Soffys, Aurelie ^{[9
]}

Tachibana, Shogo ^{[1
,3
]}

Sawada, Hirotaka ^{[1
]}

Okazaki, Ryuji ^{[10
]}

Takano, Yoshinori ^{[11
]}

Sakamoto, Kanako ^{[1
]}

Miura, Yayoi N. ^{[3
]}

Yano, Hajime ^{[1
]}

Ireland, Trevor R. ^{[12
]}

Yamada, Tetsuya ^{[1
]}

Fujimoto, Masaki ^{[1
]}

Kitazato, Kohei ^{[13
]}

Namiki, Noriyuki ^{[14
]}

Arakawa, Masahiko ^{[15
]}

Hirata, Naru ^{[13
]}

Yurimoto, Hisayoshi ^{[1
,16
]}

Nakamura, Tomoki ^{[17
]}

Noguchi, Takaaki ^{[18
]}

机构：

[1] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan

[2] Grad Univ Adv Studies SOKENDAI, Hayama, Kanagawa, Japan

[3] Univ Tokyo, Tokyo, Japan

[4] Marine Works Japan Ltd, Yokosuka, Kanagawa, Japan

[5] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo, Japan

[6] Japan Aerosp Explorat Agcy, JAXA Space Explorat Ctr, Sagamihara, Kanagawa, Japan

[7] Chiba Inst Technol, Narashino, Chiba, Japan

[8] Univ Paris Saclay, CNRS, Inst Astrophys Spatiale, Orsay, France

[9] Ctr Natl Etud Spatiales, Toulouse, France

[10] Kyushu Univ, Fukuoka, Japan

[11] Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan

[12] Univ Queensland, St Lucia, Qld, Australia

[13] Univ Aizu, Aizu Wakamatsu, Fukushima, Japan

[14] Natl Astron Observ Japan, Mitaka, Tokyo, Japan

[15] Kobe Univ, Kobe, Hyogo, Japan

[16] Hokkaido Univ, Sapporo, Hokkaido, Japan

[17] Tohoku Univ, Sendai, Miyagi, Japan

[18] Kyoto Univ, Kyoto, Japan

[19] Hiroshima Univ, Higashi Hiroshima, Higashihiroshima, Japan

[20] JAMSTEC, Kochi Inst Core Sample Res, Kochi, Japan

[21] Okayama Univ, Inst Planetary Mat, Misasa, Tottori, Japan

[22] Kindai Univ, Higashihiroshima, Japan

[23] Niigata Univ, Niigata, Japan

[24] Nagoya Univ, Nagoya, Aichi, Japan

[25] Kochi Univ, Kochi, Japan

[26] Observ Paris, Meudon, France

[27] Rikkyo Univ, Tokyo, Japan

[28] Univ La Laguna, Inst Astrofis Canarias, Tenerife, Spain

[29] Space Engn Dev Co Ltd, Sagamihara, Kanagawa, Japan

[30] JAXA, Res & Dev Directorate, Sagamihara, Kanagawa, Japan

[31] Univ Liverpool, Liverpool, Merseyside, England

[32] NEC Corp Ltd, Fuchu, Tokyo, Japan

[33] Kanagawa Inst Technol, Atsugi, Kanagawa, Japan

[34] Univ Tokyo, Kashiwa, Chiba, Japan

[35] Japan Patent Off, Tokyo, Japan

[36] Toyo Univ, Tokyo, Japan

来源：

NATURE ASTRONOMY | 2022年 / 6卷 / 02期

基金：

澳大利亚研究理事会; 日本学术振兴会;

关键词：

CARBONACEOUS CHONDRITE; TAGISH LAKE; CAMERA; DISTRIBUTIONS; CALIBRATION; COLLECTION; MINERALOGY; ONBOARD; SHAPE; SIZE;

D O I：

10.1038/s41550-021-01550-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

C-type asteroids(1) are considered to be primitive small Solar System bodies enriched in water and organics, providing clues to the origin and evolution of the Solar System and the building blocks of life. C-type asteroid 162173 Ryugu has been characterized by remote sensing(2-7) and on-asteroid measurements(8,9) with Hayabusa2 (ref. (10)). However, the ground truth provided by laboratory analysis of returned samples is invaluable to determine the fine properties of asteroids and other planetary bodies. We report preliminary results of analyses on returned samples from Ryugu of the particle size distribution, density and porosity, spectral properties and textural properties, and the results of a search for Ca-Al-rich inclusions (CAIs) and chondrules. The bulk sample mainly consists of rugged and smooth particles of millimetre to submillimetre size, confirming that the physical and chemical properties were not altered during the return from the asteroid. The power index of its size distribution is shallower than that of the surface boulder observed on Ryugu(11), indicating differences in the returned Ryugu samples. The average of the estimated bulk densities of Ryugu sample particles is 1,282 +/- 231 kg m(-3), which is lower than that of meteorites(12), suggesting a high microporosity down to the millimetre scale, extending centimetre-scale estimates from thermal measurements(5,9). The extremely dark optical to near-infrared reflectance and spectral profile with weak absorptions at 2.7 and 3.4 mu m imply a carbonaceous composition with indigenous aqueous alteration, matching the global average of Ryugu(3,4) and confirming that the sample is representative of the asteroid. Together with the absence of submillimetre CAIs and chondrules, these features indicate that Ryugu is most similar to CI chondrites but has lower albedo, higher porosity and more fragile characteristics.

引用

页码：214 / +

页数：9

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