The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)
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https://b2find.eudat.eu/dataset/2389bb8a-3211-5b97-b7b9-bef93087a87b
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The UCAC2 is the second release of the ongoing UCAC project, designed to observe the entire sky for R magnitudes of about 7.5 to 16. The observed positional errors are about...
