The second-generation Guide Star Catalog: Description and properties
The second-generation Guide Star Catalog: Description and properties
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DOI：
10.1088/0004-6256/136/2/735
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发表时间：
2008-08-01
影响因子：
5.3
通讯作者：
Zacchei, Andrea
中科院分区：
文献类型：
--
作者：
Lasker, Barry M.;Lattanzi, Mario G.;Zacchei, Andrea
指南星表二(GSC-II)是一个全天天体数据库，来自空间望远镜科学研究所根据Palomar和UK Schmidt调查板块创建的未经压缩的数字化天空调查，并向社区提供。像它的前身(GSC-I)一样，GSC-II的主要目的是为哈勃太空望远镜提供导星信息和观测规划支持。然而，这个版本已经在一些地面新技术望远镜上使用，如双子座、VLT和TNG，还将用于支持詹姆斯·韦伯空间望远镜和GAIA空间任务以及大天空区域多目标光纤光谱望远镜，这是中国正在进行的重大科学项目之一。已经从GSC-II数据库提取了两个星表，并向天文学团体发布。2001年，限幅(R(F)=18.0)版本GSC2.2在生产后不久就发布了，而GSC2.3版本自2007年以来一直可供一般访问。本文描述的GSC2.3星表包含945,592,683个天体的天体测量、光度测量和分类，精确到板块的星等极限。位置与国际天文参考系挂钩；对于恒星源，每个坐标的全天平均绝对误差范围从0‘2到0’.28取决于星等。在处理扩展物体时，天体测量误差在星系的情况下会恶化20%，而对于混合图像，天文测量误差大约会恶化2倍。恒星光度测量被确定为0.13-0.22毫克，作为星等和摄影通带(R(F)，B(J)，I(N))的函数。在银河系平面之外，恒星分类对于亮度大于R(F)=19.5的星等是可靠的，至少90%的置信度是可靠的，星表是完整的，R(F)=20。
The Guide Star Catalog II (GSC-II) is an all-sky database of objects derived from the uncompressed Digitized Sky Surveys that the Space Telescope Science Institute has created from the Palomar and UK Schmidt survey plates and made available to the community. Like its predecessor (GSC-I), the GSC-II was primarily created to provide guide star information and observation planning support for Hubble Space Telescope. This version, however, is already employed at some of the ground-based new-technology telescopes such as GEMINI, VLT, and TNG, and will also be used to provide support for the James Webb Space Telescope (JWST) and GAIA space missions as well as the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, one of the major ongoing scientific projects in China. Two catalogs have already been extracted from the GSC-II database and released to the astronomical community. A magnitude-limited (R(F) = 18.0) version, GSC2.2, was distributed soon after its production in 2001, while the GSC2.3 release has been available for general access since 2007. The GSC2.3 catalog described in this paper contains astrometry, photometry, and classification for 945,592,683 objects down to the magnitude limit of the plates. Positions are tied to the International Celestial Reference System; for stellar sources, the all-sky average absolute error per coordinate ranges from 0 ''.2 to 0 ''.28 depending on magnitude. When dealing with extended objects, astrometric errors are 20% worse in the case of galaxies and approximately a factor of 2 worse for blended images. Stellar photometry is determined to 0.13-0.22 mag as a function of magnitude and photographic passbands (R(F), B(J), I(N)). Outside of the galactic plane, stellar classification is reliable to at least 90% confidence for magnitudes brighter than R(F) = 19.5, and the catalog is complete to R(F) = 20.