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

This paper provides an analysis of astrometric measurements of the main Sat urnian satellites made thanks to CCD observations performed in 1995 at the Laboratorio Nacional de Astrofisica at Itajuba in Brazil. The astrometric r eduction is discussed especially the small corrections done here, but most of time neglected elsewhere. A catalog of 6006 differential positions has b een obtained. They have been compared to different ephemerides, the Vienne & Duriez ephemerides (TASS 1.7), the Harper & Taylor ephemerides and the Do urneau ephemerides. These observations provide a large set of modern observ ations, and appear to be of good precision. This accuracy is needed for fut ure use of these data to improve the dynamical models. These positions are included in the data base NSDC dedicated to the natural satellites(ftp://ft p.bdl.fr/pub/NSDC/saturn/raw_data/position/). They are also available at th e 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.