Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aiaa.confq....t&link_type=abstract
American Astronautical Society and American Institute of Aeronautics and Astronautics, Astrodynamics Specialist Conference, Nass
Astronomy and Astrophysics
Astronomy
Deimos, Error Analysis, Kalman Filters, Phobos, Planetary Mass, Viking Orbiter Spacecraft, Doppler Effect, Encounters, Estimating, Gravitational Effects, Orbital Mechanics, Signal Processing, Space Exploration
Scientific paper
This paper addresses the problem of estimating the masses of Phobos and Deimos from Doppler and onboard optical measurements during the Viking extended mission. A Kalman filter is used to analyze the effects of gravitational uncertainties and nongravitational accelerations. These accelerations destroy the dynamical integrity of the orbit and multi-batch or limited memory filtering is preferred to single batch processing. Optical tracking is essential to improve the relative orbit geometry. The masses can be determined to about 10% and 25% respectively for Phobos and Deimos, assuming satellite densities of about 3 g per cu cm.
Mason Michael L.
Tolson Robert H.
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