The PMM USNO-A1.0 Catalogue
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https://b2find.eudat.eu/dataset/2b0bac5d-1068-5eb6-b2e9-1ec8cf5eca71
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USNO-A1.0 is a catalog of 488,006,860 sources whose positions can be used for astrometric references. These sources were detected by the Precision Measuring Machine (PMM) built...
