We performed crater size-frequency measurement on Ryugu using high-resolution images obtained by Hayabusa2. Using Ryugu cratering chronology model, the surface age of Ryugu was estimated to be 0.1 to 1 billion years from the density of craters larger than 100 m in diameter.
Tomokatsu Morota1, Yuichiro Cho2, Masanori Kanamaru3, Rie Honda4, Shingo Kameda5, Eri Tatsumi6, Yasuhiro Yokota7, Toru Kouyama8, Hidehiko Suzuki9, Manabu Yamada10, Naoya Sakatani7, Chikatoshi Honda11, Masahiko Hayakawa7, Kazuo Yoshioka12, Moe Matsuoka13, Tatsuhiro Michikami14, Hideaki Miyamoto2, Hiroshi Kikuchi12, Ryodo Hemmi12, Masatoshi Hirabayashi15, Carolyn M Ernst16, Olivier S Barnouin17, Naoyuki Hirata18, Naru Hirata19, Hirotaka Sawada7 and Seiji Sugita6, (1)Nagoya University, Nagoya, Japan, (2)University of Tokyo, Bunkyo-ku, Japan, (3)Osaka University, Osaka, Japan, (4)Kochi University, Kochi, Japan, (5)Rikkyo University, Tokyo, Japan, (6)University of Tokyo, Tokyo, Japan, (7)ISAS/JAXA, Sagamihara, Japan, (8)National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, (9)Meiji University, Kanagawa, Japan, (10)Chiba Institute of Technology, Planetary Exploration Research Center, Narashino, Japan, (11)University of Aizu, Aizu-Wakamatsu, Japan, (12)The University of Tokyo, Tokyo, Japan, (13)AIST - National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, (14)Kinki University, Osaka, Japan, (15)Georgia Institute of Technology, Daniel Guggenheim School of Aerospace Engineering, Atlanta, United States, (16)Johns Hopkins University Applied Physics Laboratory, Laurel, United States, (17)JHU Applied Physics Lab, Laurel, United States, (18)Kobe University, Kobe, Japan, (19)The University of Aizu, Aizu-Wakamatsu, Japan
