SPM 4.0 Catalog
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The SPM4 Catalog contains absolute proper motions, celestial coordinates, and B,V photometry for 103,319,647 stars and galaxies between the south celestial pole and -20 degrees...
SPM4星表（SPM4 Catalog）收录了南天极至赤纬-20度天区范围内共计103,319,647颗恒星与星系的绝对自行、天球坐标以及B、V波段测光数据……
