A simultaneous estimation of the mass of Mars and its natural satellites, PHOBOS and Deimos, from the orbital perturbations on the Mariner 9, Viking 1, and Viking 2 orbiters

Details A simultaneous estimation of the mass of Mars and its natural satellites, PHOBOS and Deimos, from the orbital perturbations on the Mariner 9, Viking 1, and Viking 2 orbiters A simultaneous estimation of the mass of Mars and its natural satellites, PHOBOS and Deimos, from the orbital perturbations on the Mariner 9, Viking 1, and Viking 2 orbiters

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..861l&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 861-862 (SEE N94-16173 03-91)

Physics

1

Deimos, Gravitational Constant, Orbit Perturbation, Phobos, Planetary Mass, Mariner 9 Space Probe, Viking Mars Program, Viking Spacecraft

Scientific paper

The natural satellites of Mars, Phobos and Deimos, caused perturbations on the orbits of the Mariner 9, and the Viking spacecraft that were used to estimate the satellite masses. The Viking spacecraft were specifically targeted to make close flybys (within a few hundred kilometers) of Phobos in February 1977 and of Deimos in October 1977. These close encounters were used to estimate the moon's gravitational constant, GM (the universal constant of gravitation multiplied by the satellite mass). However, the Viking and Mariner 9 spacecraft made numerous flybys of Phobos and Deimos at distances of a few thousand kilometers. The tracking data from these more 'distant' encounters were processed to estimate the masses of Mars, Phobos, and Deimos.

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