AC 2000.2星表
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The AC 2000.2 is a revised version of the 1997 release of the AC 2000 (Cat. I/247). It was decided that the availability of an improved reference catalogue and the inclusion of photometry from the Tycho-2 catalogue would be sufficient to warrant a complete re-reduction of the data and a new distribution of the catalogue. The AC 2000.2 catalog contains positions of 4,621,751 stars at the average epoch of plate exposures for each star (average 1907).
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中国科学院国家天文台创建时间：
2017-07-17
