作　　者： ; ; ;

机构地区： 暨南大学信息科学技术学院计算机科学系

出　　处： 《空间科学学报》 2011年第3期344-349,共6页

摘　　要： 利用威海天文台1米望远镜观测了2009年10月7日晚的疏散星团M39.观测过程中使用了Ⅰ滤光片,并将CCD绕光轴旋转90°分别成像.使用最新的UCAC3星表和Platais的自行星表归算表明,该望远镜具有良好的天体测量性能,最好的单次位置测量精度达到了4～5 milli-arcsec.此外,观测资料还发现UCAC3星表具有明显的自行不准确性,证实了文献[14]的最新发现. The open cluster M39 was observed by the new 1-m telescope at Weihai Observatory, Shandong University in the night of Oct.7,2009.While observing,a JohnsonⅠ-type filter was used and the CCD was imaged in two orthogonal orientations,and thus 30 frames of images were delivered.After the CCD images were measured by 2-D Gaussian fit so as to obtain the star pixel positions,a number of constant plate models were attempted to solve the difference between observed positions and computed ones for each star.Our reduction of the observations showed that proper motions of the latest USNO UCAC3 star catalogue were explicitly not accurate.By contrast,those of the Platais＇s catalogue were found much better.This observations partly confirmed the errors in the proper motions of UCAC3 recently discovered by Roeser et al.Experiments have also shown that the best precision for a suitable bright star was about 4~5 milli-arcsec.It was believed that this new telescope could be used for high precision astrometry.

关 键 词： 成像 星表 疏散星团 自行误差 视场扭曲

领　　域： [天文地球] [天文地球]