*Toshiki Koga¹, Yasuhiro Oba², Yoshinori Takano¹, Hiroshi Naraoka³ (1.Japan Agency for Marine-Earth Science and Technology, 2.Institute of Low Temperature Science, Hokkaido University, 3.Department of Earth and Planetary Sciences, Kyushu University)

*Haruna Sugahara¹, Yoshinori Takano², Yasuhiro Oba³, Fumie Kabashima⁴, Jason P. Dworkin⁵, Jose C. Aponte⁵, Hiroshi Naraoka⁶, The Hayabusa2-Initial-Analysis SOM Team (1.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 2.Japan Agency for Marine-Earth Science and Technology, 3.Institute of Low Temperature Science, Hokkaido University, 4.LECO Japan, 5.Solar System Division, NASA Goddard Space Flight Center, 6.Faculty of Sciences, Kyushu University)