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• W1997604843 abstract "We examine the rotation of a small moonlet embedded in planetary rings caused by impacts of ring particles, using analytic calculation and numerical orbital integration for the three-body problem. Taking into account the Rayleigh distribution of particles' orbital eccentricities and inclinations, we evaluate both systematic and random components of rotation, where the former arises from an average of a large number of small impacts and the latter is contribution from large impacts. Calculations for parameter values corresponding to inner parts of Saturn's rings show that a moonlet would spin slowly in the prograde direction if most impactors are small particles whose velocity dispersion is comparable to or smaller than the moonlet's escape velocity. However, we also find that the effect of the random component can be significant, if the velocity dispersion of particles is larger and/or impacts of large particles comparable to the moonlet's size are common: in this case, both prograde and retrograde rotations can be expected. In the case of a small moonlet embedded in planetary rings of equal-sized particles, we find that the systematic component dominates the moonlet rotation when m/M≪0.1 (m and M are the mass of a particle and a moonlet, respectively), while the random component is dominant when m/M≳0.3. We derive the condition for the random component to dominate moonlet rotation on the basis of our results of three-body orbital integration, and confirm agreement with N-body simulation." @default.
• W1997604843 created "2016-06-24" @default.
• W1997604843 creator A5047547079 @default.
• W1997604843 date "2004-12-01" @default.
• W1997604843 modified "2023-10-18" @default.
• W1997604843 title "On the rotation of a moonlet embedded in planetary rings" @default.
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• W1997604843 doi "https://doi.org/10.1016/j.icarus.2004.07.010" @default.
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