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Gravity field of Venus - A preliminary analysisThe gravitational field of Venus obtained by tracking the Pioneer Venus Orbiter is examined. For each spacecraft orbit, two hours of Doppler data centered around periapsis were used to estimate spacecraft position and velocity and the velocity residuals obtained were spline fit and differentiated to produce line of sight gravitational accelerations. Consistent variations in line of sight accelerations from orbit to orbit reveal the presence of gravitational anomalies. A simulation of isostatic compensation for an elevated region on the surface of Venus indicates that the mean depth of compensation is no greater than about 100 km. Gravitational spectra obtained from a Fourier analysis of line of sight accelerations from selected Venus orbits are compared to the earth's gravitational spectrum and spherical harmonic gravitational potential power spectra of the earth, the moon and Mars. The Venus power spectrum is found to be remarkably similar to that of the earth, however systematic variations in the harmonics suggest differences in dynamic processes or lithospheric behavior.
Document ID
19790056814
Document Type
Reprint (Version printed in journal)
Authors
Phillips, R. J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Sjogren, W. L. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Abbott, E. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Smith, J. C. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wimberly, R. N. (California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Wagner, C. A. (NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
July 6, 1979
Publication Information
Publication: Science
Volume: 205
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other