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25 April 2024

» arxiv » 2205.05818

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The spatial distribution of impact craters on Ryugu
Naoyuki Hirata ; Tomokatsu Morota ; Yuichiro Cho ; Masanori Kanamaru ; Sei-ichiro Watanabe ; Seiji Sugita ; Naru Hirata ; Yukio Yamamoto ; Rina Noguchi ; Yuri Shimaki ; Eri Tatsumi ; Kazuo Yoshioka ; Hirotaka Sawada ; Yasuhiro Yokota ; Naoya Sakatani ; Masahiko Hayakawa ; Moe Matsuoka ; Rie Honda ; Shingo Kameda ; Mamabu Yamada ; Toru Kouyama ; Hidehiko Suzuki ; Chikatoshi Honda ; Kazunori Ogawa ; Yuichi Tsuda ; Makoto Yoshikawa ; Takanao Saiki ; Satoshi Tanaka ; Fuyuto Terui ; Satoru Nakazawa ; Shota Kikuchi ; Tomohiro Yamaguchi ; Naoko Ogawa ; Go Ono ; Yuya Mimasu ; Kent Yoshikawa ; Tadateru Takahashi ; Yuto Takei ; Atsushi Fujii ; Hiroshi Takeuchi ; Tatsuaki Okada ; Kei Shirai ; Yu-ichi Iijima ;
Date:	12 May 2022
Abstract:	Asteroid 162173 Ryugu has numerous craters. The initial measurement of impact craters on Ryugu, by Sugita et al. (2019), is based on Hayabusa2 ONC images obtained during the first month after the arrival of Hayabusa2 in June 2018. Utilizing new images taken until February 2019, we constructed a global impact crater catalogue of Ryugu, which includes all craters larger than 20 m in diameter on the surface of Ryugu. As a result, we identified 77 craters on the surface of Ryugu. Ryugu shows variation in crater density which cannot be explained by the randomness of cratering; there are more craters at lower latitudes and fewer at higher latitudes, and fewer craters in the western bulge (160 E - 290 E) than in the region around the meridian (300 E - 30 E). This variation implies a complicated geologic history for Ryugu. It seems that the longitudinal variation in crater density simply indicates variation in the crater ages; the cratered terrain around the meridian seems to be geologically old while the western bulge is relatively young. The latitudinal variation in crater density suggests that the equatorial ridge of Ryugu is a geologically old structure; however, this could be alternatively explained by a collision with many fission fragments during a short rotational period of Ryugu in the past.
Source:	arXiv, 2205.05818
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