Inferences from the dynamical history of Mercury's rotation

Physics

Scientific paper

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Angular Momentum, Mercury (Planet), Planetary Evolution, Planetary Rotation, Cores, Liquid Metals, Planetary Structure, Planetology, Tides

Scientific paper

The history of Mercury's spin angular momentum is reviewed. It is shown that the current nonsynchronous but resonant spin and the nearly zero obliquity place almost no restrictions on the primordial spin state. The only exception comes about from a liquid core-solid mantle interaction which excludes a slow primordial spin concurrent with a large obliquity. The current occupancy of a final evolutionary spin state leads to the description of a scheme by which we can determine the extent of a currently liquid Mercurian core.

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