The Fourth U.S. Naval Observatory CCD Astrograph Catalog
收藏NASA Open Data Portal2025-06-14 收录
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https://data.nasa.gov/dataset/the-fourth-u-s-naval-observatory-ccd-astrograph-catalog
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资源简介：
UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16 magnitude range in a single bandpass between V and R. Positional errors are about 15 to 20 mas for stars in...
