4 Conclusion

We present 2005 positions of the main satellites of Saturn and 67 positions of the Lagrangian satellites from CCD observations in 1995-1999 in Brazil. Since most of these frames have no reference stars, we applied an inter-satellite reduction. The positions of Tethys, Dione, Rhea and Titan given by TASS1.7 were used to determine the scale factor and the orientation of the receptor.

The comparison of the observed and computed positions shows that the RMS is about 0 $\hbox{$.\!\!^{\prime\prime}$ }$12 for the main satellites and larger for Hyperion and the Lagrangian satellites. The coordinates are given in NSDC base data and presented apart from the scale factor and from rotation, but all astrometric corrections are done. So, these differential positions are really absolute ones in the meaning that no astrometric correction is necessary to use them, even if one wants to adjust the calibration.

Acknowledgements

The authors, CHV and RVM, wish to thank the MCT/CNPq-Brazil for partial support of this work. C. H. Veiga would like to thank State of Rio de Janeiro Science Foundation - FAPERJ for providing computational facilities for this project.