Abstract
We consider the secular effect of outgassing torques on the rotation of a comet nucleus. An averaging method is applied to obtain evolutionary equations which allow us to study the long-term variations in the nucleus spin state. Since the spin axis direction of 19P/Borrelly’s nucleus is close to the line of apsides direction, a simplified version of these equations can be written to analytically study the most important qualitative effects. In particular, a correlation between the drift of the rotation axis direction and the possible spin up/spin down of the nucleus is revealed.
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Sidorenko, V.V., Scheeres, D.J. & Byram, S.M. On the rotation of comet Borrelly’s nucleus. Celest Mech Dyn Astr 102, 133–147 (2008). https://doi.org/10.1007/s10569-008-9160-7
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DOI: https://doi.org/10.1007/s10569-008-9160-7