A paper of interest to some Talkshop readers
Spin-orbit coupling and chaotic rotation for circumbinary bodies
Application to the small satellites of the Pluto-Charon system
Alexandre C. M. Correia, Adrien Leleu, Nicolas Rambaux and Philippe Robutel
Open access, published 20 August 2015
We investigate the resonant rotation of circumbinary bodies in planar quasi-circular orbits. Denoting nb and n the orbital mean motion of the inner binary and of the circumbinary body, respectively, we show that spin-orbit resonances exist at the frequencies n ± k?/2, where ? = nb – n, and k is an integer. Moreover, when the libration at natural frequency has the same magnitude as ?, the resonances overlap and the rotation becomes chaotic. We apply these results to the small satellites in the Pluto-Charon system, and conclude that their rotations are likely chaotic. However, the rotation can also be stable and not synchronous for small axial asymmetries.
The A&A site showed a related work which also might be of interest, 2011 paper on Venus LoD.
The various contributions in Venus rotation rate and LOD
Post by Tim