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Planetary ephemerides have been developed and improved over centuries. Theyare a fundamental tool for understanding solar system dynamics, and essentialfor planetary and small body mass determinations, occultation predictions,high-precision tests of general relativity, pulsar timing, and interplanetaryspacecraft navigation. This paper presents recent results from a continuingprogram of high-precision astrometric very-long-baseline interferometry (VLBI)observations of the Cassini spacecraft orbiting Saturn, using the Very LongBaseline Array (VLBA). We have previously shown that VLBA measurements can becombined with spacecraft orbit determinations from Doppler and range trackingand VLBI links to the inertial extragalactic reference frame (ICRF) to providethe most accurate barycentric positions currently available for Saturn. Here wereport an additional five years of VLBA observations along with improved phasereference source positions, resulting in an improvement in residuals withrespect to the Jet Propulsion Laboratory's dynamical ephemeris.

Astrometry of Cassini with the VLBA to Improve the Saturn Ephemeris