Hipparcos
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Hipparcos (an acronym for High Precision Parallax Collecting Satellite) was a scientific mission of the European Space Agency (ESA), launched in 1989 and operated between 1989 and 1993. It was the first space experiment devoted to astrometry, the accurate measurement of star positions, distances from us, parallaxes, and proper motions. The Hipparcos Catalogue, a high-precision catalogue of more than 100,000 stars, was published in 1997. The lower precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000.…mehr

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Hipparcos (an acronym for High Precision Parallax Collecting Satellite) was a scientific mission of the European Space Agency (ESA), launched in 1989 and operated between 1989 and 1993. It was the first space experiment devoted to astrometry, the accurate measurement of star positions, distances from us, parallaxes, and proper motions. The Hipparcos Catalogue, a high-precision catalogue of more than 100,000 stars, was published in 1997. The lower precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000.