Japan Geoscience Union Meeting 2018

Presentation information

[EE] Poster

P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS03] Small Bodies in the Solar System: Current Understanding and Future Prospects

Wed. May 23, 2018 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Masateru Ishiguro(Department of Physics and Astronomy, Seoul National University), Taishi Nakamoto(Tokyo Institute of Technology), Masahiko Arakawa(神戸大学大学院理学研究科, 共同), Masanao Abe(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)

[PPS03-P13] Shape model reconstruction of Ryugoid using Stereophotoclinometry

*Sayuri Tanaka1, Naoyuki Hirata1, Naru Hirata2, Naoki Nishikawa1, Sei-ichiro WATANABE3, Yoshiaki Ishihara4, Satoshi Tanaka4, Tomohiro Yamaguchi4, Akira Miura4, Yukio Yamamoto4 (1.Kobe University, 2.ARC-Space, the University of Aizu, 3.Nagoya University, 4.ISAS/JAXA)

Keywords:Hayabusa2, Ryugu, shape model reconstruction

The asteroid exploration mission, Hayabusa2, needs to develop the shape model of 162173 RYUGU, because the shape model helps to control the spacecraft safely and examine the nature of the asteroid. We utilized images of a vertical asteroid Ryugoid generated for a dry-run test of LSS sequence to simulate the real RYUGU, developed its image-based shape model, and evaluated its accuracy from comparing it with the true shape of Ryugoid. Then, we use software called Gaskell’s Stereophotoclinometry (SPC), which develops the shape using stereo imaging and photoclinometry. The former method determines the elevation from the parallax between two or more images. The latter method determines the slope and albedo from the variation in brightness of three or more images. We used a sphere with 450 m in radius as an initial shape and 128 boxA images with a resolution of ~ 2.0 m/pixel, 101 boxC images (0.5-0.7 m/pixel), 220 Mid-Altitude images (~0.5 m/pixel), and additional images to show the southern hemisphere. As a result, we made the shape model of entire Ryugoid. In the presentation, we will show our shape model, its accuracy compared with the true shape, and the time required to develop it.