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  • 1
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    Phobos and Deimos astrometric observations from Viking (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: This article describes the reduced astrometric observations of Phobos and Deimos derived from Viking Orbiter 1 and 2 imaging data. This data set spans four years from 1976 to 1980, contains 275 sets of spacecraft-centered, right ascension and declination observations, and has a limiting accuracy of a few km (1 sigma). The details of observation formulation and use for ephemeris improvement are given.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 201; 1, Ju
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Phobos and Deimos astrometric observations from Mariner 9 (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This article describes the reduced astrometric observations of Phobos and Deimos derived from Mariner 9 imaging data. This data set spans 11 months from 1971 and 1972, contains 82 sets of spacecraft-centered right ascension and declination observations, and has an accuracy of 3 to 10 km (1-sigma) in orbital position. The details of the observation formulation and its use for ephemeris improvement are given.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 216; 1-2,
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The motions of Phobos and Deimos from Mariner 9 TV data (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Orbit elements for the two Martian satellites Phobos and Deimos have been determined from 80 television photographs of the satellites taken by the imaging system of the Mariner 9 spacecraft. Phobos was found to be within 60 km of its positions predicted by recently published ephemeris theories which include a secular acceleration term in the longitude. This tends to corroborate the existence of a secular acceleration in the longitude of Phobos. Deimos was found to be within 100 km of its position predicted from earth-based observations. Comparison of the satellite's orbits determined from Mariner 9 data are made to these same ephemeric theories which are based on recent processing of earth-based observations. In addition, the magnitude of periodic perturbations to the satellite orbits due to Mars' gravity field and solar gravity are discussed and a 110 km long period perturbation in the longitude of Deimos is identified.
    Keywords: ASTRONOMY
    Format: text
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    NASA TECHNICAL REPORTS
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