ESA Space Astrometry Mission HIPPARCOS fuer den Zeitraum vom 1.4.1990 bis 30.6.1997 Schlussbericht

The ESA Astrometry Satellite HIPPARCOS has provided for nearly 120000 stars positions, proper motions, and parallaxes with a typical accuracy of better than 1 milliarcsecond. The TYCHO subproject has provided for more than one million stars astrometric parameters with a reduced accuracy and a precise two-colour photometry. The Astronomisches Rechen-Institut Heidelberg (ARI) has collaborated in the work of the European consortia INCA (Input Catalogue), FAST (Data reduction), and TDAC (TYCHO subproject). Within INCA, the ARI was responsible for preparing the astrometric data for the Input Catalogue. Within FAST, the ARI has carried out the tasks to determine the astrometric parameters of the stars from the satellite observations, and to link them to the fundamental system FK5. Within TDAC, the ARI has prepared and updated the ephemeris of stars observed by TYCHO. The ARI has also done important work for special objects such as astrometric binaries and VIMs (variability-induced movers). The HIPPARCOS and TYCHO Catalogues have been published by ESA in 1997. Scientific evaluations and applications of the HIPPARCOS measurements, to which the ARI has contributed significantly, and continues to do so, show that the results of the HIPPARCOS mission are of high scientific value. (orig.)Available from TIB Hannover: F98B1007+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany); Deutsche Agentur fuer Raumfahrtangelegenheiten (DARA) GmbH, Bonn (Germany)DEGerman