Geophysical Constraints on the Deep Interior of Mars: Present Status and Future Prospects

Physics

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Mars, Mars: Interior, Precession

Scientific paper

An improved determination of the spin pole precession rate of Mars will contribute greatly to our understanding of the internal structure of the planet. The moment of inertia of Mars is an extremely important global geophysical parameter, whose value is only known with an accuracy of 10%. The polar moment is determined as the ratio of two parameters: the gravitational oblateness, which is known to an accuracy of 0.01%, and the spin axis precession rate, which is known with an accuracy of 10%. Thus, a better determination of the spin precession rate will directly improve knowledge of the moment of inertia, with consequent tightening of constraints on internal density structure and composition. I will review present knowledge of the precession rate, compositional implications of various possible values of the moment of inertia, and near term prospects for improving knowledge of the deep interior of Mars from geodetic observations.

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