Consequences and inferences from tidal interactions in the solar system

Details Consequences and inferences from tidal interactions in the solar system Consequences and inferences from tidal interactions in the solar system

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ang....33...23p&link_type=abstract

(International Union of Geodesy and Geophysics, General Assembly, 16th, Grenoble, France, Aug. 25-Sept. 6, 1975.) Annales de Geo

Physics

Geophysics

Natural Satellites, Planetary Rotation, Satellite Rotation, Solar System, Tides, Angular Momentum, Deimos, Iapetus, Mercury (Planet), Phobos, Precession, Solar Orbits, Venus (Planet)

Scientific paper

A general theory of the rotation of solid bodies in the solar system leads to the following conclusions: No special initial conditions on the primordial rotation states of most tidally evolved bodies are necessary to account for their present rotation. The possible exception is the rotation of Venus, which must have been initially retrograde unless a liquid core-solid mantle interaction or an accelerating atmospheric tide could dominate the ordinary gravitational tides. Tides eventually drive all bodies in precessing orbits to 'Cassini states', where the spin vector, normal to the orbit and normal to the invariable plane remain coplanar as the first two precess about the latter. The constant obliquity in this configuration, together with the lowest order gravitational harmonics and the amplitude of the physical libration allows the determination of the central condensation and the extent of a liquid-core for Mercury. Criteria for the existence of observable amplitudes of the free wobble, free precession and libration of the moon are established which do not exclude current, non-zero values.

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