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Poster De Conférence Année : 2014

Astrometry of natural satellites Improving the dynamics of Jupiter, Mars and Saturn systems with old observations

Résumé

A new astrometric reduction of old photographic plates, benefiting from modern technologies such as sub-micrometric scanners associated with a reduction using accurate catalogues (UCAC at the present time and GAIA in a near future), provides improved knowledge of the orbital motion of planetary satellites.In the framework of an international collaboration first, and in the FP7 ESPaCE european project afterward, U.S. Naval Observatory plates were digitized with the new generation DAMIAN scanning machine of the Royal Observatory of Belgium. The procedure was applied to a few hundred photographic plates of the Martian satellites covering the years 1967-1997, of the Galilean satellites covering the years 1967-1998, and of the major Saturnian satellites covering the years 1974-1998. We provide results with an accuracy better than 60 mas in (RA,Dec) positions of the Martian satellites, better than 70 mas in (RA,Dec) positions of the Galilean moons, and better than 100 mas in (RA,Dec) positions of the major Saturnian moons. Since the positions of the planets may be deduced from the observed (RA,Dec) positions of their satellites, we can also assess the accuracy of the ephemerides of Mars, Jupiter and Saturn.
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Dates et versions

hal-01137768 , version 1 (31-03-2015)

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V Robert, D Pascu, V Lainey, Jean-Eudes Arlot. Astrometry of natural satellites Improving the dynamics of Jupiter, Mars and Saturn systems with old observations. American Astronomical Society, DPS meeting #46, Oct 2014, Tucson, United States. ⟨hal-01137768⟩
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