A&A 380, 727-733 (2001)
DOI: 10.1051/0004-6361:20011412

Saturnian satellite observations made in Brazil during the 1995 opposition with an astrometric analysis

A. Vienne^{1, 2}, W. Thuillot¹, C. H. Veiga³, J.-E. Arlot¹ and R. Vieira Martins<sup>3

1</sup>  Institut de mécanique céleste et de calcul des éphémérides -Observatoire de Paris, UMR 8028 du CNRS, 77 avenue Denfert-Rochereau, 75014 Paris, France
²  Université de Lille, 9000 Lille, France
³  Observatório Nacional, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil

(Received 7 May 2001 / Accepted 4 October 2001)

Abstract
This paper provides an analysis of astrometric measurements of the main Saturnian satellites made thanks to CCD observations performed in 1995 at the Laboratório Nacional de Astrofísica at Itajubá in Brazil. The astrometric reduction is discussed especially the small corrections done here, but most of time neglected elsewhere. A catalog of 6006 differential positions has been obtained. They have been compared to different ephemerides, the Vienne & Duriez ephemerides (TASS 1.7), the Harper & Taylor ephemerides and the Dourneau ephemerides. These observations provide a large set of modern observations, and appear to be of good precision. This accuracy is needed for future use of these data to improve the dynamical models. These positions are included in the data base NSDC dedicated to the natural satellites ( ftp://ftp.bdl.fr/pub/NSDC/saturn/raw_data/position/). They are also available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/380/727

Key words: Saturn -- satellites of Saturn -- astrometry

Offprint request: A. Vienne, Alain.Vienne@bdl.fr

Tables at the CDS

© ESO 2001

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