[P-PS03] Small Solar System Bodies: New perspectives on the origin and evolution of the Solar System

Wed. May 24, 2023 9:00 AM - 10:15 AM 301A (International Conference Hall, Makuhari Messe)

convener:Tatsuaki Okada(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Fumi Yoshida(University of Occupational and Environmental Health, Japan), Sota Arakawa(Japan Agency for Marine-Earth Science and Technology), Ryota Fukai(Japan Aerospace Exploration Agency), Chairperson:Sota Arakawa(Japan Agency for Marine-Earth Science and Technology), Tatsuaki Okada(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Ryota Fukai(Japan Aerospace Exploration Agency), Fumi Yoshida(University of Occupational and Environmental Health, Japan)

Small Solar System bodies including asteroids, comets, satellites, and the interplanetary dust particles (IDPs) preserve clues for the understanding of the origin and evolution of the Solar System and the investigation of the sources of the building blocks of life. Many discoveries have been made in recent years by the ground-based and space-borne observations and the direct in situ explorations using spacecrafts. Evident and precise data on the origin and evolution of the Solar System have been obtained by analyses of extraterrestrial materials such as meteorites, IDPs, and the samples returned by space missions. New insights are expected by the collaboration of these data-based results with theoretical and experimental studies. In this session. new results of theoretical, experimental and observational studies on small Solar System bodies are focused, as well as the latest results of remote sensing and sample analysis by Hayabusa2, OSIRS-REx , and DART missions. Scientific expectations are also discussed for the high-sensitive large-area observatories such as LSST and JWST and for the future planetary missions like Hayabusa2#, MMX, Destiny+, Hera, and Comet Interceptor, Lucy, and Psyche. Topics on the science and instruments of the Japanese next small body mission whose working group studies are just started as well as the studies for the planetary defense are also within the scope of this session.

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9:00 AM - 9:15 AM

[PPS03-01] Thermal evolution modelling of Ryugu’s parent asteroid

★Invited Papers

*Shigeru Wakita^1,2, Hidenori Genda³, Tomoki Nakamura⁴, Hisayoshi Yurimoto⁵, Takaaki Noguchi⁶, Ryuji Okazaki⁷, Hikaru Yabuta⁸, Hiroshi Naraoka⁷, Kanako Sakamoto⁹, Shogo Tachibana¹⁰, Sei-ichiro WATANABE¹¹, Yuichi Tsuda⁹ (1.Massachusetts Institute of Technology, 2.Purdue University, 3.Tokyo Institute of Technology, 4.Tohoku University, 5.Hokkaido University, 6.Kyoto University, 7.Kyushu University, 8.Hiroshima University, 9.Japan Aerospace Exploration Agency , 10.University of Tokyo, 11.Nagoya University)

9:15 AM - 9:30 AM

[PPS03-02] Thermal evolution of pebble-pile comets and its dependence on the latent heat of crystallization of impure H₂O ice

*Sota Arakawa¹, Shigeru Wakita² (1.Japan Agency for Marine-Earth Science and Technology, 2.Massachusetts Institute of Technology)

9:30 AM - 9:45 AM

[PPS03-03] Evolution of boulder size distribution on near-Earth asteroids

*Yuta Aikyo¹, Tomokatsu Morota¹ (1.The University of Tokyo)

9:45 AM - 10:00 AM

[PPS03-04] Automatic detection and measurement of boulders size and shape on Ryugu using deep learning

*Suomi Seki^1,2, Toru Kouyama², Xuanchao Fu^1,2, Wenhao Shen^1,2, Ichiro Yoshikawa¹ (1.The University of Tokyo, 2.National Institute of Advanced Industrial Science and Technology)

10:00 AM - 10:15 AM

[PPS03-05] Relationships between temperature distributions and thermal inertias of boulders observed by the low-altitude operation of the Hayabusa2

*Ayumu Ohsugi^1,2, Naoya Sakatani², Yuri Shimaki², Masaniri Kanamaru¹, Takuya Ishizaki², Hiroki Senshu³, Takehiko Arai⁴, Hirohide Demura⁵, Toru Kouyama⁶, Tomohiko Sekiguchi⁷, Satoshi Tanaka^1,2, Tatsuaki Okada^2,1 (1.The University of Tokyo, 2.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3.Chiba Institute of Technology, 4.Maebashi Institute of Technology, 5.University of Aizu, 6.National Institute of Advanced Industrial Science and Technology, 7.Hokkaido University of Education)