Améliorations des positions des etoiles Hipparcos par l'utilisation des observations ``star-mapper''
Mignard, F.; Donati, F.; Falin, J. L.; Froeschlé, M.; Canuto, E.
France, Italy
Abstract
Results on star-mapper data for attitude determination based on observations carried out over fifteen reference great circle's (RGC) are presented and discussed. Precision on the three-angle attitude reconstruction is of the order of 60 milli-arcsec along-scan and 100 and 180 milli-arcsec normal-to-scan. With this first year data, it is possible to correct the star position from the residuals of the attitude solution. Satisfactory corrections are obtained for RGC's abscissa and used at a latter stage of the reduction to remove grid-step ambiguity in the RGC reduction.