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Using astrometric observations spanning more than a century and including a large set of Cassini data, we determine Saturn's tidal parameters through their current effects on the orbits of the eight main and four coorbital Moons. We have used the latter to make the first determination of Saturn's Love number from observations, k2=0.390±0.024, a value larger than the commonly used theoretical value...
The natural planetary satellites are observed since centuries in order to understand their dynamics and their evolution. A high level astrometric accuracy is necessary for this purpose. The arrival of Gaia makes necessary to perform the ground-based observations in the scope of the future data provided by Gaia. About 50 observations by Gaia of each satellite will be available, and the Gaia star catalogue...
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