Reconstruction of the voyager Saturn encounter orbits in the ICRF system

The Voyager I and Voyager 2 spacecraft visited the Saturnian system in November 1980 and August 1981, respectively. Campbell et al.(1) discussed the determination of the spacecraft orbits, and Campbell and Anderson(2) used data from the encounters to improve knowledge of the Saturnian gravity field. In anticipation of the Cassini tour, we have re-examined the results from the Voyager mission. We obtain Voyager trajectories in the International Celestial Reference Frame, and we revise the gravity field taking advantage of improvements made in modelling and data processing since the previous work. We also incorporate a full dynamical model for the Saturnian satellites into the analysis for the first time.