[P-CG30] New Progress toward the Understanding of Small Solar System Bodies

Wed. May 27, 2015 9:00 AM - 10:45 AM A02 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Masahiko Arakawa(Graduate School of Science, Kobe University), Taishi Nakamoto(Tokyo Institute of Technology), Sei-ichiro WATANABE(Division of Earth and Planetary Sciences, Graduate School of Science, Nagoya University), Masanao Abe(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), MASATERU ISHIGURO(Department of Physics and Astronomy, Seoul National University), Chair:Taishi Nakamoto(Tokyo Institute of Technology)

This session is aimed at setting up a forum to discuss how we can make progresses in our understanding of the solar system evolution with our hands on data. Presentations related to the science of the small bodies in the solar system (satellites, asteroids, comets, interplanetary dust particles, trans-Neptunian objects, and planetesimals) are invited. In addition to the extensive astronomical/remote-sensing observations and theoretical works, Hayabusa has brought us samples back from Itokawa (S-type asteroid) for unprecedentedly detailed analysis. The results of the Hayabusa sample initial analysis do prove that analysis of returned samples will play a key role in our future study of the solar system evolution. While the mission preparation of Hayabusa2, which is targeted at a more primordial asteroid than Itokawa (1999JU3, C-type), will be launched in 2014 winter, expectation of building a new gateway to biology-flavored topics via organic material and aqueous alternation analysis is ramping up. In this session, after summarizing the cutting-edge results obtained by various methods including the Hayabusa sample analysis, we will discuss the future shape of the study of the solar system evolution.

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9:00 AM - 9:15 AM

[PCG30-16] Formation of carbon-rich grains of the Chelyabinsk and Nio meteoritic showers.

*Yasunori MIURA¹ (1.Yamaguchi, Visiting Univ.(In & Out))

9:15 AM - 9:30 AM

[PCG30-17] The possibility of np-Fe production by solar wind protons on the airless body surfaces.

*Yusuke NAKAUCHI¹, Toru MATSUMOTO², Masanao ABE³, Akira TSUCHIYAMA², Kohei KITAZATO⁴, Koutaku SUZUKI⁵ (1.SOKENDAI(The Graduate University for Advanced Studies), 2.Kyoto University, 3.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 4.University of Aizu, 5.Wakasa Wan Energy Research Center)

9:30 AM - 9:45 AM

[PCG30-18] Experimental study on low velocity impact onto granular media:Dependence on gravity acceleration and ambient pressure

*Masato KIUCHI¹, Akiko NAKAMURA¹ (1.Graduate School of Science, Kobe University)

9:45 AM - 10:00 AM

[PCG30-19] Cratering experiments on coarse-grained targets: application to the resurfacing age of a rubble-pile asteroid Itokawa

*Eri TATSUMI¹, Seiji SUGITA² (1.Dept. of Complexity Science and Engineering, Univ. of Tokyo, 2.Dept. of Earth and Planetary Science, Univ. of Tokyo)

10:00 AM - 10:15 AM

[PCG30-20] Hypervelocity cratering experiments on ice-silicate mixture targets

*Shota TAKANO¹, Masahiko ARAKAWA¹, Minami YASUI¹, Sunao HASEGAWA² (1.Graduate School of Science, Kobe University, 2.Japan Aerospace Exploration Agency)

10:15 AM - 10:30 AM

[PCG30-21] Ejecta velocity distribution for impact crater formed on quartz sand: Effect of projectile density on crater scaling law

Sayaka TSUJIDO¹, *Masahiko ARAKAWA¹, Ayako SUZUKI², Minami YASUI¹, Kazuma MATSUE¹, Shota TAKANO¹, Sunao HASEGAWA² (1.Graduate School of Science, Kobe University, 2.Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science)