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Observations of the Planetary Satellites Europa and Titan by Hipparcos

Published online by Cambridge University Press:  12 April 2016

J.-E. Arlot ,
A. Bec-Borsenberger  and
G. Dourneau
J.-E. Arlot
Affiliation:
Bureau des Longitudes, URA 707 du CNRS 77 avenue Denfert-Rochereau, F-75014 Paris
A. Bec-Borsenberger
Affiliation:
Bureau des Longitudes, URA 707 du CNRS 77 avenue Denfert-Rochereau, F-75014 Paris
G. Dourneau
Affiliation:
Observatoire de l’Université Bordeaux I avenue P. Sémirot, F-33000 Floirac

Abstract

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Observations of the satellites Europa and Titan will be obtained from the European Astrometric Satellite HIPPARCOS. These observations will be used to obtain “observed” positions of the planets Jupiter and Saturn; these positions have the advantages, first to be given in the reference frame defined by the Hipparcos system, and second, the accuracy on these positions is better than the accuracy of the ground-based observations of these planets. To obtain the positions of the planets from those of their satellites, we have to take the calculated positions of these satellites by means of their ephemerides. The accuracy of the computed positions of Europa and Titan relatively to their primary is of the order of 0ʺ.l, better than the one of the direct observation of Jupiter and Saturn. An efficient comparison of the different ephemerides of these planets will be possible that way.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 206 - 209
Copyright
Copyright © United States Naval Observatory 1991

References

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