The PPMXL Catalog
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下载链接：
https://b2find.eudat.eu/dataset/b189e2f9-9ec5-5805-97b1-3c818dd70475
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资源简介：
USNO-B1.0 (Cat. I/284) and 2MASS (Cat. II/246) are the most widely used full-sky surveys. However, 2MASS has no proper motions at all, and USNO-B1.0 published only relative, not...
