Astrometric reduction of CCD observations of planetary satellites without reference star : application to Saturn's satellites
Résumé
We present an astrometric reduction for the case of inter-satellites measurements when no astrometric stars is present on the frame. We discuss precisely all significant astrometric corrections. Some of these corrections are often neglected, but we show they can not be negligible. The reduction presented here allows to give coordinates apart from a scale factor and from a rotation. These coordinates are astrometric because no astrometric consideration is necessary to use them, even if one wants to touch up the calibration. The good accuracy obtained is needed for the fututre use of these data to improve the dynamical models.
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