The Guide Star Catalog, Version 1.2: An Astrometric Recalibration and Other Refinements
The Guide Star Catalog, Version 1.2: An Astrometric Recalibration and Other Refinements
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DOI：
10.1086/319383
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发表时间：
2001-03
期刊：
影响因子：
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通讯作者：
J. Morrison;S. Röser;B. McLean;B. Bucciarelli;B. Lasker
中科院分区：
文献类型：
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作者：
J. Morrison;S. Röser;B. McLean;B. Bucciarelli;B. Lasker
空间望远镜科学研究所（STScI）和天文计算研究所之间的合作对拉斯克等人发表的导星星表（GSC）进行了一次天体测量学的重新归算。这个版本，即GSC 1.2，极大地减少了GSC 1.1中存在的系统误差。正如塔夫等人所示，GSC 1.1中的位置受到基于底片的系统畸变的影响，这种畸变在底片边缘处最大（北部为1.″0，南部为1.″2）。此外，莫里森等人已经表明，这些位置还受到系统误差的影响，该误差是星等以及距底片中心径向距离的函数。对于距底片中心2.°7以内的半径，这种影响较小，然后迅速增大，在底片边缘处产生了暗星（15等）相对于参考星（10等）0.″9的平均偏移。由于对于构成GSC的两个主要底片集（它们是用不同的望远镜、曝光时间、乳胶和滤光片拍摄的），星等项是相似的，我们认为这种影响对于快速大视场施密特底片是常见的。在本文中，我们报告了GSC 1.2的天体测量质量，并介绍了我们开发的（针对大型底片集）用于量化和减少取决于底片上位置和星等的位置误差的方法。获取星表的说明可以从STScI的万维网站点获得，或者用户可以直接从CDS（斯特拉斯堡天文数据中心）获取星表。这个版本的星表尚未安装在哈勃空间望远镜导星选择系统中。因此，这个版本绝不能用于哈勃空间望远镜的观测计划。
A collaboration between the Space Telescope Science Institute (STScI) and the Astronomisches Rechen-Institut has produced an astrometric re-reduction of the Guide Star Catalog (GSC) published by Lasker et al. This version, GSC 1.2, has dramatically reduced the systematic errors present in the GSC 1.1. As shown by Taff et al., the positions in the GSC 1.1 are affected by plate-based systematic distortions that are largest at the plate edges (1.″0 in the north and 1.″2 in the south). In addition, Morrison et al. have shown that these positions also suffer from systematic errors which are a function of magnitude and radial distance from the plate center. This effect is small for radii under 2.°7 from the plate center, then rapidly increases, producing an average offset of the faint stars (15 mag) versus the reference stars (10 mag) of 0.″9 at the plate edges. Since the magnitude term was similar for the two main plate collections comprising the GSC, which were taken with different telescopes, exposure times, emulsions, and filters, we believe this effect is common to fast wide-field-of-view Schmidt plates. In this paper we report on the astrometric quality of the GSC 1.2 and present the method we developed (for large plate collections) to quantify and reduce the positional errors which are dependent on location on the plate and magnitude. Instruction for obtaining the catalog may be obtained from the STScI World Wide Web site, or the user can obtain the catalog directly from CDS (Centre de Donneés astronomiques de Strasbourg). This version of the catalog has not been installed in the HST Guide Star Selection system. Therefore this version must not be used for HST observation planning.