Mars gravity field derived from Viking-1 and Viking-2 - The navigation result

Details Mars gravity field derived from Viking-1 and Viking-2 - The navigation result Mars gravity field derived from Viking-1 and Viking-2 - The navigation result

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aiaa.confr....c&link_type=abstract

American Institute of Aeronautics and Astronautics and American Astronautical Society, Astrodynamics Conference, Palo Alto, Cali

Astronomy and Astrophysics

Astronomy

Mars (Planet), Planetary Gravitation, Viking Mars Program, Data Reduction, Interplanetary Trajectories, Mars Environment, Orbit Calculation, Planetary Orbits, Trajectory Analysis, Viking Orbiter Spacecraft

Scientific paper

Viking-1 and Viking-2 Doppler tracking data taken during orbit phases characterized by 1500 km subperiapse altitudes have provided a basis for a determination of the Martian gravity field. Navigation results show that the linear combination of short-arc gravity estimates is an acceptable technique for obtaining gravity models over multiple data arcs. An ensemble field composed of Viking data and Mariner-9 a priori retains the inherent local accuracy of its constituent fields. At the same time, the model can be made to be valid globally by careful weighting of a priori Mariner-9 data. The sixth degree and order model presented reduces the error concerning the change in period by more than an order of magnitude during the high altitude (1500 km) phases of the Viking mission. The resulting areoid deviates by no more than 150 m from the areoid produced by the a priori Mariner-9 field.

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