[P-PS03] 太陽系小天体研究：現状の理解と将来の展望

[PPS03-P04] Observation Campaign of DESTINY+ Mission Target Asteroid 3200 Phaethon (1983 TB) during the 2017 Apparition

*MYUNGJIN KIM¹、Hee-Jae Lee^1,2、Sang-Min Lee^1,2、Dong-Heun Kim^1,2、Fumi Yoshida³、Jintae Park¹、Young-Jun Choi^1,4、Hong-Kyu Moon¹、Hong-Suh Yim¹、Jin Choi^1,4、Eun-Jung Choi¹、Alexander Serebryanskiy⁵、Maxim Krugov⁵、Inna Reva⁵、Ergashev Kamoliddin⁶、Otabek Burhonov⁶、Shuhrat A. Ehgamberdiev⁶ (1.Korea Astronomy and Space Science Institute、2.Chungbuk National University、3.Planetary Exploration Research Center (PERC), Chiba Institute of Technology、4.University of Science and Technology、5.Fesenkov Astrophysical Institute、6.Ulugh Beg Astronomical Institute)

キーワード：asteroids, Phaethon, photometry, lightcurve, shape

Near-Earth asteroid 3200 Phaethon (hereafter Phaethon) is the primary target of DESTINY+. The observation window for Phaethon in the end of 2017 is a good opportunity to acquire high quality dense photometric data as Phaethon passed the Earth only within 27 LD (Lunar Distance) on 16 Dec 2017, the closest approach in 40 years. However, the spin status including rotational period and pole orientation is not precisely constrained due to small variations in the lightcurve amplitude, probably resulting from a spheroidal shape. We carried out the photometric observation campaign for Phaethon between Asia and American Continents, during the period early Nov and mid-Dec 2017. We employed several telescopes: OWL 0.5 m, LOAO 1.0 m in Mt. Lemmon, USA, Maidanak 0.6 m in Uzbekistan, SOAO 0.6 m in Mt. Sobaek, Korea, 1.0 m in Kazakstan, BOAO 1.8 m in Mt. Bohyun, Korea. Based on our dataset, we will present the lightcurve and shape model of Phaethon.