XPM Catalog of positions and proper motions

We combined data from the Two-Micron All Sky Survey (2MASS) and USNO-A2.0 catalogues in order to derive the absolute proper motions of about 280 million stars distributed all...我们结合了2微米全天巡天（Two-Micron All Sky Survey，2MASS）与美国海军天文台A2.0星表（USNO-A2.0）的数据，以推导出约2.8亿颗全域分布恒星的绝对自行。