JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 P (宇宙惑星科学) » P-PS 惑星科学

[P-PS02] [EE] Small Bodies: Exploration of the Asteroid Belt and the Solar System at Large

2017年5月22日(月) 15:30 〜 17:00 ポスター会場 (国際展示場 7ホール)

コンビーナ:eleonora ammannito(University of California Los Angeles)、中本 泰史(東京工業大学)、安部 正真(宇宙航空研究開発機構宇宙科学研究所)、Christopher T Russell(University of California Los Angeles)、渡邊 誠一郎(名古屋大学大学院環境学研究科地球環境科学専攻)

[PPS02-P07] Polarimetric Study of (331471) 1984 QY1, a Potential Dormant Comet Candidate

*Jooyeon Kim1Masateru Ishiguro2Yoonsoo Park Bach2Daisuke Kuroda3Hiroyuki Naito4Yuna Grace Kwon2Yoonyoung Kim2Masataka Imai7Kiyoshi Kuramoto5Makoto Watanabe6 (1.Department of Astronomy and Space science, Kyunghee University、2.Department of Physics and Astronomy, Seoul National University、3.National Astronomical Observatory of Japan、4.Nayoro Observatory、5.Division of Earth and Planetary Sciences, Hokkaido University、6.Department of Applied Physics, Faculty of Science, Okayama University of Science、7.Department of Cosmoscience, Graduate School of Science, Okayama University of Science)

キーワード:asteroid, polarimetry, potential dormant comet

Identification between asteroids and comets are fundamental to know the spatial distribution of small bodies in the solar system, and yet, it is challenging to find dormant comets in the list of known asteroids because their appearances are indistinguishable from asteroids. Here we provide a unique research to discriminate asteroids and dormant comets via ‘polarimetry’. We thus conducted a polarimetric observation of (331471) 1984 QY1 (hereafter QY1) using the Multi-Spectral Imager (MSI) on the 1.6-m Pirka Telescope from UT 2016 May 25 to June 24. The object has been regarded as a dormant comet candidate in terms of the dynamical property (i.e. the Tisserand parameter with respect to Jupiter TJ = 2.68, the probability of Jupiter-comet origin PJFC = 96 %; Bottke et al. 2002). We investigated the phase angle dependence of polarization degree of QY1, and found that it shows the polarization degree Pmax = 7.4 +/- 0.2 % around the phase angle α = 100 degree. The polarimetric property is similar to those of S-type asteroids rather than cometary nuclei. In this presentation, we introduce our observation and discuss about the possible origin of QY1 based on our observation together with the dynamical properties.