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tokens: N.J.C. is grateful to the Paris Observatory for funding as an invited researcher at the IMCCE. We thank the FP7-ESPaCE European program for funding under the agreement No. 263466. N.J.C. and C.D.M. thank the Science and Technology Facilities Council (Grant No. ST/P000622/1) for financial support. This work was also supported by the International Space Science Institute (ISSI). The authors thank their colleagues in the Encelade working group at the IMCCE of the Paris Observatory ( http://www.issibern.ch/teams/saturnastrometry/?page%20id=21 ), and the members and associates of the Cassini ISS team. We are heavily indebted to the authors of the SPICE software toolkit, without whom the development of Caviar would have been a considerably more difficult task.