A high resolution gravity model for Venus - GVM-1

Details A high resolution gravity model for Venus - GVM-1 A high resolution gravity model for Venus - GVM-1

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..599n&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 7, p. 599-602.

Physics

22

Gravitational Fields, Mathematical Models, Spatial Resolution, Venus (Planet), Errors, Pioneer Venus 1 Spacecraft, Satellite Tracking, Spherical Harmonics, Topography, Venus, Gravity Properties, Models, Gravity Field, Doppler Methods, Spacecraft Observations, Pvo Mission, Harmonics, Comparisons

Scientific paper

A spherical harmonic model of the gravitational field of Venus complete to degree and order 50 has been developed using the S-band Doppler tracking data of the Pioneer Venus Orbiter (PVO) collected between 1979 and 1982. The short wavelengths of this model could only be resolved near the PVO periapse location (about 14 deg N latitude), therefore a priori constraints were applied to the model to bias poorly observed coefficients towards zero. The resulting model has a half-wavelength resolution of 400 km near the PVO periapse location, but the resolution degrades to greater than 1000 km near the poles. This gravity model correlates well with a degree 50 spherical harmonic expansion of the Venus topography derived from a combination of Magellan and PVO data. New tracking data from Magellan's gravity mission should provide some improvement to this model, although a complete model of the Venusian gravity field will depend on tracking of Magellan after the circularization of its orbit using aerobraking.

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