The moment of inertia and isostasy of Mars

Details The moment of inertia and isostasy of Mars The moment of inertia and isostasy of Mars

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82..369r&link_type=abstract

Journal of Geophysical Research, vol. 82, Jan. 10, 1977, p. 369-375.

Physics

Geophysics

20

Gravitational Fields, Gravity Anomalies, Isostasy, Mars (Planet), Moments Of Inertia, Planetary Gravitation, Geophysics, Planetary Mass, Satellite Tracking, Spherical Harmonics, Spheroids

Scientific paper

The systematic and large deviation of the gravitational equipotential surface (EPS) of Mars from a spheroid of revolution suggests a description of Mars in terms of a spheroid nearly in isostatic equilibrium with an extra mass in the Tharsis region. The displacement from Mars and the shape of the spheroid are calculated by using this description and a Mars gravity model. The EPS is represented as a contour map of its height above the spheroid. This representation provides the first clear demonstration that the Hellas depression coincides with a depression in the EPS. The disequilibrium contribution of Tharsis to the coefficient J2 of the second-degree harmonics of gravitational potential of Mars is estimated to be (126 + or - 5) times 10 to the minus 6th. The optical flattening and dynamic flattening calculated on this basis are in substantially better agreement than are those calculated in the usual way.

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