Vincent Robert

TL;DR: In this article, the authors used two independent measurements obtained with the Cassini spacecraft to measure Titan's orbital expansion rate and found that Titan rapidly migrates away from Saturn on a timescale of roughly ten billion years, corresponding to a tidal quality factor of Saturn of Q ≃ 100, more than a hundred times smaller than most expectations.

TL;DR: In this paper, the authors used two independent measurements obtained with the Cassini spacecraft to measure Titan's orbital expansion rate and found that Titan migrates away from Saturn at 11.3 $\pm$ 2.0 cm/year, corresponding to a tidal quality factor of Saturn of Q $\simeq$ 100, and a migration timescale of roughly 10 Gyr.

TL;DR: The arrival of Gaia makes necessary to perform the ground-based observations in the scope of the future data provided by Gaia, and about 50 observations by each satellite will be available, and the Gaia star catalogue will allow to reduce the astrometric observations with a high level accuracy.

TL;DR: In this paper, the positioning accuracy of the inner satellites determined with photometry is estimated for dynamical studies, based on estimating the relative positions of the outer satellites of Amalthea and Thebe.

TL;DR: In this article, a sub-micrometric scanner was used to digitize old photographic plates to obtain an accuracy of 50 mas where the old reductions were not better than 500 mas.