07/02/2002 3:14 pm
ESA-SP 1200 (Volume 1) - Hypparcos and Tycho catalogues
The data obtained by Hipparcos is of unprecedented accuracy and will be used to tackle many unsolved issues in astronomy, such as the structure of the Galaxy, the evolution of stars, and the age of the Universe (this figure is in equatorial coordinates).
Status : April 1997
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