| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1773963 | Icarus | 2011 | 10 Pages |
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 L1:L2:L3 = 1.0:1.0:1.6. The direction of the total rotational angular momentum is around λ = 310°, β = −10°, or λ = 132°, β = −17°. The nutation angle is approximately constant at 65°. (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 L1:L2:L3 = 1.5:1.5:1.0. The pole orientation is around λ = 330°, β = −27°. 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.
Highlight► We conduct an observation campaign for 107P/Wilson–Harrington (W–H). ► The lightcurve of W–H shows a periodicity with a commensurability of 3:1. ► A sidereal rotation period of W–H is 0.2979 day and the other period is 0.0993 day. ► The sidereal rotation period can explain different past reports about the period. ► The period of 0.0993 day reflects the capability of tumbling, binary, and shape.
