Statistics of small craters observed on boulder surface of asteroid ryugu

Takai1, T. Morota1, K. Yumoto1, R. Honda2, S. Kameda3, E. Tatsumi1,4, Y. Cho1, K. Yoshioka1, H. Sawada5, Y. Yokota2,5, N. Sakatani3, M. Hayakawa5, M. Matsuoka5, M. Yamada6, T. Kouyama7, H. Suzuki8, C. Honda9, K. Ogawa10,11, S. Sugita1, 1Univ. of Tokyo (takai@eps.s.u-tokyo.ac.jp), Tokyo, Japan, 2Kochi Univ., Kochi, Japan, 3Rikkyo Univ., Tokyo, Japan, 4Instituto de Astrofísica de Canarias, Tenerife, Spain, 5Japan Aerospace Exploration Agency, Kanagawa, Japan, 6Planetary Exploration Research Center Chiba Institute of Technology, Chiba, Japan, 7National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan, 8Meiji Univ., Kanagawa, Japan, 9Univ. of Aizu, Fukushima, Japan, 10Japan Aerospace Exploration Agency, JAXA Space Exploration Center, Kanagawa, Japan, 11Kobe Univ., Hyogo, Japan