論文

基本情報

氏名 渡邉 誠
氏名(カナ) ワタナベ マコト
氏名(英語) Watanabe Makoto
所属 理学部 物理学科
職名 准教授
researchmap研究者コード B000222325
researchmap機関 岡山理科大学

題名

Polarimetric Study of Near-Earth Asteroid (1566) Icarus

単著・共著の別

共著

著者

Masateru Ishiguro, Daisuke Kuroda, Makoto Watanabe, Yoonsoo P. Bach, Jooyeon Kim, Mingyeong Lee, Tomohiko Sekiguchi, Hiroyuki Naito, Katsuhito Ohtsuka, Hidekazu Hanayama, Sunao Hasegawa, Fumihiko Usui, Seitaro Urakawa, Masataka Imai, Mitsuteru Sato, Kiyoshi Kuramoto

概要

We conducted a polarimetric observation of the fast-rotating near-Earth asteroid (1566) Icarus at large phase (Sun-asteroid-observer's) angles α = 57°-141° around the 2015 summer solstice. We found that the maximum values of the linear polarization degree are Pmax = 7.32 ± 0.25% at phase angles of αmax = 124° ± 8° in the V-band and Pmax = 7.04 ± 0.21% at αmax = 124° ± 6° in the RC-band. Applying the polarimetric slope-albedo empirical law, we derived a geometric albedo of pV = 0.25 ± 0.02, which is in agreement with that of Q-type taxonomic asteroids. αmax is unambiguously larger than that of Mercury, the Moon, and another near-Earth S-type asteroid (4179) Toutatis but consistent with laboratory samples with hundreds of microns in size. The combination of the maximum polarization degree and the geometric albedo is in accordance with terrestrial rocks with a diameter of several hundreds of micrometers. The photometric function indicates a large macroscopic roughness. We hypothesize that the unique environment (i.e., the small perihelion distance q = 0.187 au and a short rotational period of Trot = 2.27 hr) may be attributed to the paucity of small grains on the surface, as indicated on (3200) Phaethon.

発表雑誌等の名称

The Astronomical Journal

出版者

American Astronomical Society

154

5

開始ページ

180

終了ページ

発行又は発表の年月

2017/10

査読の有無

有り

招待の有無

無し

記述言語

英語

掲載種別

研究論文(学術雑誌)

ISSN

ID:DOI

10.3847/1538-3881/aa8b1a

ID:NAID(CiNiiのID)

ID:PMID

URL

JGlobalID

arXiv ID

ORCIDのPut Code

DBLP ID