Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rvgsp..21..528s&link_type=abstract
Reviews of Geophysics and Space Physics (ISSN 0034-6853), vol. 21, April 1983, p. 528-537.
Astronomy and Astrophysics
Astronomy
5
Geodesy, Planetology, Solar System, Spaceborne Astronomy, Jupiter (Planet), Mars (Planet), Moon, Orbital Resonances (Celestial Mechanics), Pioneer Venus 1 Spacecraft, Saturn (Planet), Uranus (Planet), Venus (Planet), Review, Planets, Geodesy, Parameters, Satellites, Physical Properties, Shape, Rotation, Gravity Properties, Pioneer Venus, Orbiters, Pvo, Voyager Missions, Radii, Mass, Gravity Fields, Data, Mercury(Planet), Venus, Mars, Moon, Jupiter, Terrestrial Planets, Giant Planets, Saturn, Uranus, Neptune
Scientific paper
The current known geodetic parameters of the planets and their moons are reviewed. A 3:2 spin-orbit resonance has been calculated for Mercury, a planet for which previous mass estimates are suggested to be inaccurate by 30 pct. The Pioneer Venus Orbiter data indicated a Venus diameter of 6051 km, a geoid surface highly-correlated with the surface topography, and regional gravity anomalies. Reflective mirrors on the surface and data from the Lunar Orbiter 4 have produced values for the principal polar moment of inertia homogeneity factor, the earth-moon mass ratio, a fifth degree and order spherical harmonic gravity model, the lunar acceleration, and the lunar potential Love number. The Mars gravity field is now estimated up to 12th degree and order spherical harmonics from Mariner 9 and Viking Orbiters 1 and 2, which also obtained new topographical data. New gravity fields and mass are being calculated for the Jovian and Saturnian moons. The outer planets' radii and rotational periods have recently been revised to greater accuracy. New data will be forthcoming from the Space Telescope and the planned Venus Radar Mapper.
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