Hipparcos astrometry satellite under test. Engineers testing the Hipparcos satellite at Toulouse in late 1987. Hipparcos (High Precision Parallax Collecting Satellite) was launched on 8 August 1989,but was stranded in geostationary transfer orbit (GTO) by a booster failure. Despite this,the satellite has managed to measure the parallax,proper motion and position of over 120,000 stars to an accuracy of 0. 002 arcseconds,about 20 times better than Earth-bound observations | |
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