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A high resolution gravity model for Venus - GVM-1A 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.
Document ID
19930051835
Document Type
Reprint (Version printed in journal)
Authors
Nerem, R. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bills, B. G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mcnamee, J. B. (JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
April 9, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 7
ISSN: 0094-8276
Subject Category
LUNAR AND PLANETARY EXPLORATION
Distribution Limits
Public
Copyright
Other