Photometric observations of 107P/Wilson¨CHarrington

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• 作者：Seitaro  ; Urakawa^a ;   ; ^{urakawa@spaceguard.or.jp} ; Shin-ichiro  ; Okumura^a ; Kota  ; Nishiyama^a ; Tsuyoshi  ; Sakamoto^a ; Noritsugu  ; Takahashi^a ; Shinsuke  ; Abe^b ; Masateru  ; Ishiguro^c ; Kohei  ; Kitazato^d ; Daisuke  ; Kuroda^e ; Sunao  ; Hasegawa^f ; Kouji  ; Ohta^g ; Nobuyuki  ; Kawai^h ; Yasuhiro  ; Shimizu^e ; Shogo  ; Nagayamaⁱ ; Kenshi  ; Yanagisawa^e ; Michitoshi  ; Yoshida^j ; Makoto  ; Yoshikawa^a ;   ; ^f
• 关键词：Asteroids ; Rotation ; Comets ; Photometry ; Satellites of asteroids
• 刊名：Icarus
• 出版年：2011
• 出版时间：September 2011
• 年：2011
• 卷：215
• 期：1
• 页码：17-26
• 全文大小：733 K

文摘

We present lightcurve observations and multiband photometry for 107P/Wilson¨CHarrington using five small- and medium-sized telescopes. The lightcurve has shown a periodicity of 0.2979 day (7.15 h) and 0.0993 day (2.38 h), which has a commensurability of 3:1. The physical properties of the lightcurve indicate two models: (1) 107P/Wilson¨CHarrington is a tumbling object with a sidereal rotation period of 0.2979 day and a precession period of 0.0993 day. The shape has a long axis mode (LAM) of L₁:L₂:L₃ = 1.0:1.0:1.6. The direction of the total rotational angular momentum is around ¦Ë = 310¡ã, ¦Â = ?0¡ã, or ¦Ë = 132¡ã, ¦Â = ?7¡ã. The nutation angle is approximately constant at 65¡ã. (2) 107P/Wilson¨CHarrington is not a tumbler. The sidereal rotation period is 0.2979 day. The shape is nearly spherical but slightly hexagonal with a short axis mode (SAM) of L₁:L₂:L₃ = 1.5:1.5:1.0. The pole orientation is around ¦Ë = 330¡ã, ¦Â = ?7¡ã. In addition, the model includes the possibility of binary hosting. For both models, the sense of rotation is retrograde. Furthermore, multiband photometry indicates that the taxonomy class of 107P/Wilson¨CHarrington is C-type. No clear rotational color variations are confirmed on the surface.