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

Wed. May 27, 2026 10:45 AM - 12:15 PM 302 (International Conference Hall, Makuhari Messe)

Chairperson:Ito Motoo(Kochi Institute for Core Sample Research JAMSTEC), Yoshida Fumi(University of Occupational and Environmental Health, Japan), Okada Tatsuaki(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)

Asteroids, comets, satellites, and other small solar system bodies
provide crucial clues for understanding the origin and evolution of
the solar system and for supplying the building blocks of life.
Numerous discoveries have been made through ground-based and space
telescope observations and direct exploration by spacecraft.
Meanwhile, in addition to analyzing meteorites and cosmic dust, the
analysis of returned samples via sample return missions has enabled
the acquisition of empirical and highly precise information.
Integrating observational research, sample analysis studies, and
theoretical/laboratory experiments is expected to foster new
perspectives in planetary science. This session will focus on the
latest theoretical and experimental research on solar system small
bodies (meteorite & sample return analyses via high resolution
analytical techniques), the latest results from ground-based
observations, and new insights from current missions such as
OSIRIS-REx and DART. It will also cover high-sensitivity observations
expected in the large telescopes like LSST and JWST, as well as the
Hayabusa2#, MMX, Destiny+, Hera, Comet Interceptor, Lucy, and Psyche,
and the scientific progress achievable through their coordination.
Furthermore, we encourage active discussion on the next-generation
asteroid exploration mission concepts and payload studies currently
under Working Group consideration, as well as on planetary defense.

+Add all to schedule

10:45 AM - 11:00 AM

[PPS03-01] Freezing and evaporation on the parent bodies of Ryugu and Bennu: brine minerals suggest divergent fate of liquid water on icy planetesimals

*Jinfei Yu¹, Hiroyuki Kurokawa¹ (1. The University of Tokyo)

11:00 AM - 11:15 AM

[PPS03-02] Size–Frequency Distribution of Phosphate-Rich Micrograins in Bennu and Ryugu Samples and Its Influence on Surface Spectral Properties

*Shunpei Nakahara¹ (1. University of Tokyo)

11:15 AM - 11:30 AM

[PPS03-03] Modeling boulder size distribution evolution with thermal exfoliation rates inferred from small craters on Ryugu boulder

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

11:30 AM - 11:45 AM

[PPS03-04] Small-scale Cr and Ti isotopic heterogeneity in Ryugu samples influenced by parent-body aqueous alteration

*Tetsuya Yokoyama¹, Karina Lopez Garcia¹, Ikshu Gautam¹, Tsuyoshi Iizuka², Makiko K. Haba¹, Nao Nakanishi¹, Ryota Fukai³ (1. Department of Earth and Planetary Sciences, School of Science, Institute of Science Tokyo, 2. Department of Earth and Planetary Science, The University of Tokyo, 3. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)

11:45 AM - 12:05 PM

[PPS03-05] Recent Activities and Future Directions of the Small Bodies Assessment Group

★Invited Papers

*Ronald Terik Daly¹ (1. Johns Hopkins University Applied Physics Laboratory)

時間調整 (12:05 PM - 12:15 PM)