Physics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975cemec..12...77b&link_type=abstract
(International Astronomical Union and COSPAR, Colloquium on Planetary Satellites, 28th, Ithaca, N.Y., Aug. 18-21, 1974.) Celesti
Physics
21
Deimos, Mariner 9 Space Probe, Orbital Elements, Phobos, Planet Ephemerides, Acceleration (Physics), Circular Orbits, Natural Satellites, Orbit Perturbation, Spacecraft Television, Video Data
Scientific paper
Orbit elements for the two Martian satellites Phobos and Deimos have been determined from 80 television photographs of the satellites taken by the imaging system of the Mariner 9 spacecraft. Phobos was found to be within 60 km of its positions predicted by recently published ephemeris theories which include a secular acceleration term in the longitude. This tends to corroborate the existence of a secular acceleration in the longitude of Phobos. Deimos was found to be within 100 km of its position predicted from earth-based observations. Comparison of the satellite's orbits determined from Mariner 9 data are made to these same ephemeric theories which are based on recent processing of earth-based observations. In addition, the magnitude of periodic perturbations to the satellite orbits due to Mars' gravity field and solar gravity are discussed and a 110 km long period perturbation in the longitude of Deimos is identified.
Born George H.
Duxbury Thomas C.
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