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|Title: ||Photometric observations of 107P/Wilson-Harrington|
|Keywords: ||ASTEROID LIGHTCURVE INVERSION;DIGITAL SKY SURVEY;WILSON-HARRINGTON;OPTIMIZATION METHODS;PHYSICAL-PROPERTIES;TUMBLING ASTEROIDS;BINARY ASTEROIDS;3200 PHAETHON;596 SCHEILA;P/2010 A2|
|Issue Date: ||2012-03-27 18:12:41 (UTC+8)|
|Abstract: ||We present lightcurve observations and multiband photometry for 107P/Wilson-Harrington 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-Harrington 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 L(1):L(2):L(3) = 1.0:1.0:1.6. The direction of the total rotational angular momentum is around lambda = 310 degrees, beta = -10 degrees, or lambda = 132 degrees, beta = -17 degrees. The nutation angle is approximately constant at 65 degrees. (2) 107P/Wilson-Harrington 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 L(1):L(2):L(3) = 1.5:1.5:1.0. The pole orientation is around lambda = 330 degrees, beta = -27 degrees. 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-Harrington is C-type. No clear rotational color variations are confirmed on the surface. (C) 2011 Elsevier Inc. All rights reserved.|
|Appears in Collections:||[天文研究所] 期刊論文|
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