A general review of the present state of astrometry is presented. A discrimination is made between survey-like missions of catalogs among which one may distinguish fundamental, secondary and reference catalogs, and missions designed to measure the astrometric parameters of specified stars. A general picture of the past and future astrometric results is summarized in graphs showing the number of stars versus the precision in positions, parallaxes, and proper motions. Expected performances of future space astrometry missions are presented and discussed (DIVA, FAME, LIGHT, GAIA and SIM).
Journées 1999 - systèmes de référence spatio-temporels & IX. Lohrmann-Kolloquium. Motion of celestial bodies, astrometry and astronomical reference frames
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