The USNO-B1.0 Catalog
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https://b2find.eudat.eu/dataset/22d34715-ed69-52d5-ae15-d525fcc319c6
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资源简介：
The USNO-B1.0 is a catalog that presents positions, proper motions, magnitudes in various optical passbands, and star/galaxy estimators for 1,045,913,669 objects derived from...
