Guide Star Catalog II
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The Guide Star Catalog II was compiled by the Catalog and Surveys branch of the Space Telescope Science Institute. It has 998,402,801 coordinate entries most of which are distinct astronomical objects, and has positions, classifications, and magnitudes for 455,851,237 objects.
The second catalog is much larger than the original Guide Star Catalog, which had "only" 20,000,000 objects.
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