Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82..340l&link_type=abstract
Astronomy and Astrophysics, vol. 82, no. 3, Feb. 1980, p. 340-348.
Astronomy and Astrophysics
Astronomy
53
Ephemerides, Galilean Satellites, Voyager Project, Astrometry, Astronomical Photography, Data Processing, Eclipses, Jupiter (Planet), Jupiter, Satellites, Ephemeris, Earth-Based Observations, Motion, Occultations, Eclipses, Voyager 1, Models, Data, Parameters, Photographic Observations, Analysis, Io, Europa, Ganymede, Callisto, Astronomy, Comparisons, Librations
Scientific paper
Over 4800 earth-based observations of Jupiter's Galilean satellites have been analyzed in order to develop improved ephemerides of the satellites for the Voyager mission, using the new theory of motion of the Galilean satellites. Included are over 1700 eclipses of the satellites by Jupiter spanning the interval 1878-1974, 85 mutual events (eclipses and occultations) observed in 1973, and over 2900 exposures on photographic plates from 1967-1978. The resulting ephemerides (labeled E-2) were employed for the Voyager I encounter and are in error by less than 200 km at the time of Jupiter close approach. A very small (0.066 deg) amplitude of the Laplacian free libration is indicated by the data.
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