1. Hayabusa Project Team, Institute of Space and Astronautical Sciences (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan.
2. School of Engineering, Tokai University, Kanagawa 259-1292, Japan.
3. Department of Geosystem Engineering, University of Tokyo, Tokyo 113-8656, Japan.
4. Planetary Science Institute, 1700 East Ft. Lowell Road, Suite 106, Tucson, AZ 85719, USA.
5. National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan.