The Fifth 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-fifth-u-s-naval-observatory-ccd-astrograph-catalog
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The US Naval Observatory (USNO) has a long history of providing accurate astrometric data for millions of stars from their own observations plus other data. The USNO CCD...
