Precise position measurements of Jupiter, Saturn and Uranus systems with the Very Large Array

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Jupiter (Planet), Planet Ephemerides, Saturn (Planet), Uranus (Planet), Very Large Array (Vla), Very Long Base Interferometry, Galilean Satellites, Position (Location), Titan

Scientific paper

Radio tracking measurements of spacecraft associated with the inner planets, such as the Viking Orbiters around Mars, combined with VLBI measurements indicate that the frames of the inner planets (i.e. their ephemerides), stellar system, and the VLBI reference sources are consistent to better than ±0arcsec.3 (Newhall et al., 1984). In the work reported here, the authors have attempted to utilize the outer planets for the same purpose with the additional goal of improving the outer-planet ephemerides. The results for the three planets are very similar and suggest that the ephemeris reference frame for the outer planets is in error by roughly -0.2 arc sec in right ascension.

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