Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..355d&link_type=abstract
(Colloquium on Phobos-Mars Mission, Paris, France, Oct. 23-27, 1989, Proceedings. A91-29558 11-91) Planetary and Space Science (
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17
Astronomical Models, Phobos, Planetary Craters, Satellite Surfaces, Spherical Harmonics, Viking Orbiter Spacecraft, Astronomical Photography, Topography, Mars, Satellites, Phobos, Surface, Models, Topography, Analysis, Procedure, Craters, Stickney, Spacecraft Observations, Geometry, Density, Viking Missions, Orbiters, Calculations, Diagrams
Scientific paper
Analytic expressions are derived to model the surface topography and the normal to the surface of Phobos. The analytic expressions are comprised of a spherical harmonic expansion for the global figure of Phobos, augmented by addition terms for the large crater Stickney and other craters. Over 300 craters were measured in more than 100 Viking Orbiter images to produce the model. In general, the largest craters were measured since they have a significant effect on topography. The topographic model derived has a global spatial and topographic accuracy ranging from about 100 m in areas having the highest resolution and convergent, stereo coverage, up to 500 m in the poorest areas.
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