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ID 34749
本文ファイル
著者
Kim, Junhan
Ishiguro, Masateru
Hanayama, Hidekazu
Hasegawa, Sunao
Usui, Fumihiko
Yanagisawa, Kenshi
Sarugaku, Yuki
Watanabe, Jun-ichi
キーワード
comets: general
comets: individual (P/2010 A2)
minor planets, asteroids: general
NDC
天文学・宇宙科学
抄録(英)
An inner main-belt asteroid, P/2010 A2, was discovered on 2010 January 6. Based on its orbital elements, it is considered that the asteroid belongs to the Flora collisional family, where S-type asteroids are common, while showing a comet-like dust tail. Although analysis of images taken by the Hubble Space Telescope and Rosetta spacecraft suggested that the dust tail resulted from a recent head-on collision between asteroids, an alternative idea of ice sublimation was suggested based on the morphological fitting of ground-based images. Here, we report a multiband observation of P/2010 A2 made on 2010 January with a 105 cm telescope at the Ishigakijima Astronomical Observatory. Three broadband filters, g', R-c, and I-c, were employed for the observation. The unique multiband data reveal that the reflectance spectrum of the P/2010 A2 dust tail resembles that of an Sq-type asteroid or that of ordinary chondrites rather than that of an S-type asteroid. Due to the large error of the measurement, the reflectance spectrum also resembles the spectra of C-type asteroids, even though C-type asteroids are uncommon in the Flora family. The reflectances relative to the g' band (470 nm) are 1.096 +/- 0.046 at the R-c band (650 nm) and 1.131 +/- 0.061 at the I-c band (800 nm). We hypothesize that the parent body of P/2010 A2 was originally S-type but was then shattered upon collision into scattering fresh chondritic particles from the interior, thus forming the dust tail.
掲載誌名
Astrophysical Journal Letters
746巻
1号
開始ページ
L11
出版年月日
2012
出版者
IOP Publishing Ltd
ISSN
2041-8205
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
(c) 2012. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
関連情報URL
部局名
宇宙科学センター