Most astrometry software packages use the Guide Star Catalogue, so a CD-ROM drive is also required.
很多天文软件包都使用引导星目录库，所以配置一个光驱也视必要的。
Until quite recently, the only useable catalogue for CCD observers was the Hubble Space Telescope's Guide star catalogue (GSC), that contains about 18 million objects (stars and galaxies).
直到目前，对于CCD观测者唯一合适可用的星表是GSC(哈勃空间望远镜的引导星参考星表)，它包含1.8亿个目标(恒星和星系)。
Until quite recently, the only useable catalogue for CCD observers was the Hubble Space Telescope's Guide star catalogue (GSC), that contains about 18 million objects (stars and galaxies).
直到目前，对于CCD观测者唯一合适可用的星表是GSC(哈勃空间望远镜的引导星参考星表)，它包含1.8亿个目标(恒星和星系)。
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