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Influence of the astrometric accuracy of observation on the extrapolated ephemerides of natural satellites

Published online by Cambridge University Press:  01 October 2007

J. Desmars ,
J.-E. Arlot  and
A. Vienne
J. Desmars
Affiliation:
Institut de Mécanique Céleste et de Calcul des Éphémérides - Observatoire de Paris, UMR 8028 CNRS, 77 avenue Denfert-Rochereau, 75014 Paris, France email: [email protected]
J.-E. Arlot
Affiliation:
Institut de Mécanique Céleste et de Calcul des Éphémérides - Observatoire de Paris, UMR 8028 CNRS, 77 avenue Denfert-Rochereau, 75014 Paris, France email: [email protected]
A. Vienne
Affiliation:
Institut de Mécanique Céleste et de Calcul des Éphémérides - Observatoire de Paris, UMR 8028 CNRS, 77 avenue Denfert-Rochereau, 75014 Paris, France email: [email protected] Université de Lille, 59000 Lille, France
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Abstract

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The accuracy of planetary satellites ephemerides is determined not only by the accuracy of dynamical model (internal accuracy) but also by the accuracy of the observations (external accuracy) used to fit the initial parameters of a model. This external accuracy extrapolated in the future is unknown most of the time and tends to degrade the global accuracy of ephemerides. Even if we can estimate the quality of the ephemerides by comparison with observations, we do not know how to determinate the evolution of the accuracy outside the period of observations. We will present a statistical method, resampling of observations, which allows a better estimation of the extrapolated accuracy in the future.

Keywords

planets and satellites: individual (Saturn)astrometryephemerides
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 96 - 97
Copyright
Copyright © International Astronomical Union 2008

References

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