Abstract
The first astrometric satellite Hipparcos (HIgh Precision PARallax COllecting Satellite) was launched in August 1989. Hipparcos measures parallaxes, positions and proper motions of more than 100 000 stars. The parallaxes are of special interest for astrophysicists, whereas the positions and proper motions will provide a reference frame with an accuracy of about 2 mas and 2 mas/yr, respectively. The positional accuracy is by a factor of nearly 50 better than for the FK 5, the best optical reference frame at present, and the star density is much higher: The FK 5 has an accuracy of about 90 to 100 mas at the present epoch for about 1500 stars (Lenhardt et al., 1992).
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Dick, W.R. (1993). Hipparcos Extragalactic Link and Earth Rotation Parameters. In: Montag, H., Reigber, C. (eds) Geodesy and Physics of the Earth. International Association of Geodesy Symposia, vol 112. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78149-0_101
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DOI: https://doi.org/10.1007/978-3-642-78149-0_101
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