The mass of PHOBOS from Viking flybys

Details The mass of PHOBOS from Viking flybys The mass of PHOBOS from Viking flybys

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977georl...4..555c&link_type=abstract

Geophysical Research Letters, vol. 4, Dec. 1977, p. 555-557.

Physics

4

Flyby Missions, Phobos, Viking Mars Program, Gravitational Constant, Orbital Elements, Postflight Analysis, Satellite Observation

Scientific paper

The mass of the Martian satellite Phobos has been determined by processing radiometric tracking data obtained from the Viking-1 spacecraft during a series of 14 near encounters which occurred in February 1977. Distances of closest approach ranged from 89 to 213 km from the center of mass of the satellite. Our best estimate for the gravitational constant of Phobos is (6.6 plus or minus 0.8) x 10 to the -4th cu km/sq sec. The corresponding density of Phobos based on a volume estimate of 4800 plus or minus 960 cu km from Mariner 9 imaging is 2.0 plus or minus 0.5 gm/cu cm.

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