Galilean satellite evolution - Observational evidence for secular changes in mean motions

Astronomy and Astrophysics – Astronomy

Scientific paper

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Celestial Mechanics, Galilean Satellites, Planetary Evolution, Secular Variations, Eclipses, Europa, Io, Jupiter (Planet), Jupiter, Satellites, Io, Ganymede, Europa, Callisto, Evolution, Motion, Astronomy, Eclipses, Voyager Missions, Spacecraft Observations, Mass, Celestial Mechanics, Ephemeridies, Calculations, Parameters, Orbits

Scientific paper

Various theories of the evolution of Jupiter's Galilean satellite system critically depend upon reliable values for secular changes in the mean motion n1 of Io and upon the relative evolution between Io and Europa ν= n1 - 2n2. Previous determinations of n1 by de Sitter and by Goldstein are reviewed and new results based upon an analysis of over 16000 eclipse observations combined with modern photographic data, with mutual event observations and with Voyager optical navigation images are presented. It is found that the secular changes in the mean motions of the satellites are much smaller than those determined from other investigations.

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