The origin of the systematic component of planetary rotation. I - Planet on a circular orbit

Details The origin of the systematic component of planetary rotation. I - Planet on a circular orbit The origin of the systematic component of planetary rotation. I - Planet on a circular orbit

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...94..126l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 94, Nov. 1991, p. 126-159.

Statistics

Computation

28

Planetary Evolution, Planetary Rotation, Protoplanets, Spin Dynamics, Angular Momentum, Astronomical Models, Collision Parameters, Orbital Mechanics

Scientific paper

A computation is undertaken of the rotation rate of a planet that has accreted from small solid planetesimals, as a function of the eccentricities of the planetesimals' orbits at or near the plane of the planet's orbit. The spin angular momentum generated by a given collision can be either positive or negative; due to the tendency to approximately cancel out, this perturbation process must be pursued to the second order in the ratio of the planetary radius to the planetesimal radial excursions' amplitude. It is found that material accreted from the area of the planet feeding zone's outer edges furnishes the planet positive spin angular momentum.

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