Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spfl...22..303b&link_type=abstract
Spaceflight, vol. 22, Sept-Oct. 1980, p. 303-311.
Astronomy and Astrophysics
Astronomy
Astronomical Photometry, Deimos, Mars Surface, Phobos, Planetary Evolution, Asteroids, Mariner 7 Space Probe, Mariner 9 Space Probe, Planetary Composition, Planetary Orbits, Secular Variations, Viking Orbiter Spacecraft, Mars, Satellites, Phobos, Deimos, Asteroids, Earth-Based Observations, Photographs, Viking 1, Viking 2, Orbits, Characteristics, Origin, Mariner 7, Mariner 9, Acceleration, Composition, Capture, Hypotheses, Surface, Diagrams, Features, Comparisons
Scientific paper
Present knowledge of the Martian satellites Phobos and Deimos is reviewed. The discovery and early photometry of the two faint moons, which orbit only 5920 and 20,120 km from the Martian surface, is discussed, and their orbital characteristics are indicated. Observations of the secular acceleration of Phobos and the probable cause of the spiralling downward of the satellite are then discussed. Mariner 7 observations of Phobos and results of Mariner 9 and Viking Orbiter 1 and 2 investigations of Phobos and Deimos are considered, with particular attention given to the shapes, surface markings and impact features of the moons. Finally, theories of the composition and origin of Phobos and Deimos are discussed, and possible mechanisms for the capture of these bodies are suggested.
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