The recently released Tycho-2 Catalogue is expected to supersede the currently used catalogs based on the Tycho data, specifically, the ACT Reference Catalog and the Tycho Reference Catalogue. Here the proper motions of the newly released Tycho-2 Catalogue are compared with those of the Hipparcos Catalogue and the ACT Reference Catalog. Tycho-2 is found to be consistent with Hipparcos at a level below 0.5 mas yr-1. Comparisons with the ACT reveal differences in systematic errors between the two, most likely due to the 1997 reduction of the Astrographic Catalogue. This comparison shows that the ACT follows the Hipparcos system at a level better than 1.0 mas yr-1, but Tycho-2 is an improvement. Some of the largest deviations of individual stars between Tycho-2 and the other two catalogs are also investigated.
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机译:预计最近发布的Tycho-2目录将取代基于Tycho数据的当前使用的目录,特别是ACT参考目录和Tycho参考目录。在这里,将新发布的Tycho-2目录的正确动作与Hipparcos目录和ACT参考目录的动作进行比较。发现Tycho-2与Hipparcos一致,水平低于0.5 mas yr-1。与ACT的比较揭示了两者之间系统误差的差异,这很可能是由于1997年《星象学目录》的减少。该比较表明,ACT遵循Hipparcos系统的水平优于1.0 mas yr-1,但Tycho-2是一种改进。还研究了第谷2号和其他两个目录之间单个恒星的最大偏差。
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