천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제42권2호
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- Pages.49.2-49.2
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- 2017
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- 1226-2692(pISSN)
The fragmented asteroid 354P/LINEAR (2010 A2) captured by the K-GMT science program
- Kim, Yoonyoung (Seoul National University) ;
- Ishiguro, Masateru (Seoul National University) ;
- Lee, Myung Gyoon (Seoul National University)
- 발행 : 2017.10.10
초록
With support from the K-GMT science program (PID: GN-2016B-Q-14), we conducted observations of active asteroid 354P/LINEAR (2010 A2) when it made its closest approach to Earth (i.e., the geocentric distance of 1.06 au on 2017 January 27-28). Taking advantage of the best observing geometry since the discovery, we obtained the first evidence for the rotational status of the largest fragment (~120 m in diameter), which was slowly rotating, that is, the rotational period of 11.36 hours. In addition, we succeed in direct imaging of 10 sub-fragments (~20 m in diameter or larger). Based on these new observational results, we conjecture that this active asteroid was created as a result of catastrophic collision among unknown asteroids. The details of this work are given in Astrophysical Journal Letters, 842, L23.
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