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ヒグチ アリカ
Higuchi Arika
樋口 有理可 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 准教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2019/03 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes |
| 執筆形態 | その他 |
| 掲載誌名 | Science |
| 出版社・発行元 | American Association for the Advancement of Science (AAAS) |
| 巻・号・頁 | 364(6437),pp.eaaw0422-eaaw0422 |
| 著者・共著者 | S. Sugita,R. Honda,T. Morota,S. Kameda,H. Sawada,E. Tatsumi,M. Yamada,C. Honda,Y. Yokota,T. Kouyama,N. Sakatani,K. Ogawa,H. Suzuki,T. Okada,N. Namiki,S. Tanaka,Y. Iijima,K. Yoshioka,M. Hayakawa,Y. Cho,M. Matsuoka,N. Hirata,N. Hirata,H. Miyamoto,D. Domingue,M. Hirabayashi,T. Nakamura,T. Hiroi,T. Michikami,P. Michel,R.-L. Ballouz,O. S. Barnouin,C. M. Ernst,S. E. Schröder,H. Kikuchi,R. Hemmi,G. Komatsu,T. Fukuhara,M. Taguchi,T. Arai,H. Senshu,H. Demura,Y. Ogawa,Y. Shimaki,T. Sekiguchi,T. G. Müller, |
| 概要 | The near-Earth carbonaceous asteroid 162173 Ryugu is thought to have been produced from a parent body that contained water ice and organic molecules. The Hayabusa2 spacecraft has obtained global multi-color images of Ryugu. Geomorphological features present include a circum-equatorial ridge, east/west dichotomy, high boulder abundances across the entire surface, and impact craters. Age estimates from the craters indicate a resurfacing age of <inline-formula><m:math xmlns:m="http://www.w3.org/1998/Math/MathML" overflow="scroll"><m:mrow><m:mo>≲</m:mo><m:msup><m:mrow><m:mn>10</m:mn></m:mrow><m:mn>6</m:mn></m:msup></m:mrow></m:math></inline-formula> years for the top 1-meter layer. Ryugu is among the darkest known bodies in the Solar System. The high abundance and spectral properties of boulders are consistent with moderately dehydrated materials, analogous to thermally metamorphosed meteorites found on Earth. The general uniformity in color across Ryugu’s surface supports partial dehydration due to internal heating of the asteroid’s parent body. |
| DOI | 10.1126/science.aaw0422 |
| ISSN | 0036-8075/1095-9203 |
| PMID | 30890587 |
| PermalinkURL | https://syndication.highwire.org/content/doi/10.1126/science.aaw0422 |