Research Catalog

Geophysical interpretation of Venus gravity data grant NAGW-409 : semiannual status report no. 4 and 5 for the period 1 July 1984 through 30 June 1985

Title
Geophysical interpretation of Venus gravity data [microform] : grant NAGW-409 : semiannual status report no. 4 and 5 for the period 1 July 1984 through 30 June 1985 / principal investigator, Dr. Robert D. Reasenberg.
Author
Reasenberg, R. D.
Publication
Cambridge, Mass. : Smithsonian Institution, Astrophysical Observatory ; [Washington, DC : National Aeronautics and Space Administration ; Springfield, Va. : National Technical Information Service, distributor, 1985]

Details

Additional Authors
  • Smithsonian Astrophysical Observatory.
  • United States. National Aeronautics and Space Administration.
Description
6, [1] p. : ill.
Summary
"The investigation of the subsurface mass distribution of Venus through the analysis of the data from Pioneer Venus Orbiter (PVO) is presented. The Doppler tracking data was used to map the gravitational potential, which was compared to the topographic data from the PVO radar (ORAD). In order to obtain an unbiased comparison, the topography obtained from the PVO-ORAD was filtered to introduce distortions which are the same as those of our gravity models. The last major software package that was required in order to determine the spectral admittance Z (lambda) was used. This package solves the forward problem given the topography and its density, and assuming no compensation, find the resulting spacecraft acceleration along a given nominal trajectory. The filtered topography is obtained by processing these accelerations in the same way (i.e., with the same geophysical inverter) as the Doppler-rate data that we use to estimate the gravity maps."--NTRS abstract.
Series Statement
NASA CR ; 176063
Uniform Title
NASA contractor report ; NASA CR-176063.
Subject
  • Venus probes
  • Gravitational fields
  • Doppler radar
  • Extraterrestrial environments
  • Pioneer Venus 1 spacecraft
  • Planetary mapping
  • Space exploration
  • Topography
  • Venus (Planet)
  • Venus surface
  • Venus (Planet) > Density > Data processing
Note
  • "July 1985."
Type of Report (note)
  • Semiannual status report;
Reproduction (note)
  • Microfiche.
Funding (note)
  • Grant
Call Number
GPO Microfiche NAS 1.26:176063
OCLC
marcive137362613
Author
Reasenberg, R. D.
Title
Geophysical interpretation of Venus gravity data [microform] : grant NAGW-409 : semiannual status report no. 4 and 5 for the period 1 July 1984 through 30 June 1985 / principal investigator, Dr. Robert D. Reasenberg.
Imprint
Cambridge, Mass. : Smithsonian Institution, Astrophysical Observatory ; [Washington, DC : National Aeronautics and Space Administration ; Springfield, Va. : National Technical Information Service, distributor, 1985]
Series
NASA CR ; 176063
NASA contractor report ; NASA CR-176063.
Type Of Report
Semiannual status report; 1 July 1984 through 30 June 1985.
Reproduction
Microfiche. [Washington, D.C. : National Aeronautics and Space Administration], 1985. 1 microfiche.
Funding
Grant NAGW-409
Added Author
Smithsonian Astrophysical Observatory.
United States. National Aeronautics and Space Administration.
Gpo Item No.
0830-H-14 (MF)
Sudoc No.
NAS 1.26:176063
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