摘要
准确求解望远镜成像系统中视场的几何扭曲是高精度天体测量中的关键环节.借鉴哈勃空间望远镜几何扭曲求解的思想,提出并实施了一种简便、有效的方法.应用到云南天文台1米望远镜2011年4月2~3日观测疏散星团M67所得的72幅CCD图像表明:望远镜存在明显的几何扭曲效应,在视场角落最大扭曲~0.6pixel(~120mas).经扭曲改正后,视场中星象的定位精度有了明显提高.
It is crucial to solve accurately the geometric distortion of a field of view for high precision astrometry.A convenient approach is proposed in this paper using the reference for the solution of equivalent to the Hubble Space Telescope(HST).Based on the 72 CCD exposures taken for the open cluster M67(NGC2682) on April 2-3,2011 by the 1-m telescope at the Yunnan Observatory,obvious geometric distortions are found for the telescope with maximum distortion ~0.6 pixel(~120 mas) at the corner of field of view.After correcting the distortion,the measurement precision of stellar positions has significantly improved.
出处
《中国科学:物理学、力学、天文学》
CSCD
北大核心
2011年第9期1126-1130,共5页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金(批准号:10973007)
暨南大学中央高校基本科研业务费专项资金资助项目
关键词
几何扭曲
CCD成像
几何定标
geometric distortions
CCD imaging
astrometric calibration