Research at the University of Copenhagen (University of Copenhagen) · 1992 · 14 citations · 0 references
Natural SciencesAstronomyPhysicsAstrophysicsObservational AstronomyStellar AstronomyAstrometric Data ReductionAstrometric InstrumentationData ReductionSatellite InstrumentationSpace-based AstrometryStar CatalogsAstrometric ReductionAstrometric Reduction TechniquesGeostationary OrbitsSpace Telescope AstrometryStar Catalogue Reduction
This paper gives an overview of the assumptions and algorithms adopted by the Northern Data Analysis Consortium (NDAC) for the reduction of data from the space astrometry satellite Hipparcos. A fairly detailed account is given of the main steps of the reduction, viz., the attitude determination, analysis of image dissector tube data, great-circle reductions and sphere solution. Of these, only aspects of the attitude determination have required substantial revision due to the satellite's failure to reach geostationary orbit. A brief outline is given of the instrument calibrations and the analysis of non-single stars