The USNO-B1.0 Catalog
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https://b2find.eudat.eu/dataset/8475c97d-333c-53a0-ac5d-17d6ff65bba6
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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...
