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Transneptunian objects (TNOs) are a source of invaluable information toaccess the history and evolution of the outer solar system. However, observingthese faint objects is a difficult task. As a consequence, important propertiessuch as size and albedo are known for only a small fraction of them. Now, withthe results from deep sky surveys and the Gaia space mission, a new excitingera is within reach as accurate predictions of stellar occultations by numerousdistant small solar system bodies become available. From them, diameters withkilometer accuracies can be determined. Albedos, in turn, can be obtained fromdiameters and absolute magnitudes. We use observations from the Dark EnergySurvey (DES) from November 2012 until February 2016, amounting to 4292847 CCDframes. We searched them for all known small solar system bodies and recovereda total of 202 TNOs and Centaurs, 63 of which have been discovered by the DEScollaboration until the date of this writing. Their positions were determinedusing the Gaia Data Release 2 as reference and their orbits were refined.Stellar occultations were then predicted using these refined orbits plusstellar positions from Gaia. These predictions are maintained, and updated, ina dedicated web service. The techniques developed here are also part of anambitious preparation to use the data from the Large Synoptic Survey Telescope(LSST), that expects to obtain accurate positions and multifilter photometryfor tens of thousands of TNOs.

Astrometry and Occultation predictions to Trans-Neptunian and Centaur Objects observed within the Dark Energy Survey