Seiji Sugita¹, Tomokatsu Morota², Rie Honda³, Shingo Kameda⁴, Eri Tatsumi⁵, Shogo Tachibana⁶, Kohei Kitazato⁷, Tatsuaki Okada⁸, Noriyuki Namiki⁹, Masahiko Arakawa¹⁰, Patrick Michel¹¹, Deborah Lorin Domingue¹², Satoshi Tanaka¹³, Makoto Yoshikawa¹⁴, Seiichiro Watanabe¹⁵, Yuichi Tsuda⁸ and Hayabusa2 Team, (1)University of Tokyo, Bunkyo-ku, Japan, (2)University of Tokyo, Tokyo, Japan, (3)Kochi University, Kochi, Japan, (4)Rikkyo University, Tokyo, Japan, (5)Instituto de Astrofísica de Canarias, Tenerife, Spain, (6)Hokkaido Univ., Sapporo, Japan, (7)The University of Aizu, Aizu-Wakamatsu, Japan, (8)JAXA, Sagamihara, Japan, (9)NAOJ National Astronomical Observatory of Japan, Tokyo, Japan, (10)Kobe Univ., Kobe, Japan, (11)UNS-CNRS-Observatoire de la Cote d'Azur, Laboratoire Lagrange, NIce, France, (12)Planetary Science Institute Tucson, Tucson, AZ, United States, (13)Japan Aerospace Exploration Agency, Sagamihara, Japan, (14)Japan Aerospace Exploration Agency, Kanagawa, Japan, (15)Nagoya Univ., Nagoya, Japan