A CONVENIENT SOLUTION TO GEOMETRIC DISTORTION AND ITS APPLICATION TO PHOEBE'S OBSERVATIONS
A CONVENIENT SOLUTION TO GEOMETRIC DISTORTION AND ITS APPLICATION TO PHOEBE'S OBSERVATIONS
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DOI：
10.1088/0004-6256/144/6/170
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
Q. Peng;A. Vienne;Qingfeng Zhang;J. Desmars;C. Yang;H. He
中科院分区：
文献类型：
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作者：
Q. Peng;A. Vienne;Qingfeng Zhang;J. Desmars;C. Yang;H. He
提出了一种简单有效的测量地面望远镜CCD视场几何变形的方法。对于三个疏散星系团(M35、M67和NGC2324)，用云南天文台1m望远镜拍摄的425幅ccd图像来检验这种方法。研究发现，几何失真图案强烈地依赖于所使用的相应的滤波器。几何失真随后被用来校正土星第九颗卫星菲比及其参考星的像素位置，这些恒星是由同一望远镜拍摄的220幅ccd图像。校正几何失真后，菲比的(O−C；观测值减去计算值)残差的标准差显著改善。
A simple but effective approach is proposed for measuring the geometric distortion of a CCD field of view of a ground-based telescope. For three open clusters (M35, M67, and NGC 2324), 425 CCD frames taken by a 1 m telescope at the Yunnan Observatory are used to test this approach. It is found that the geometric distortion pattern depends strongly on the corresponding filter used. The geometric distortion is then used to correct the pixel positions for Phoebe, the ninth satellite of Saturn, and its reference stars imaged in 220 CCD frames taken by the same telescope. The standard deviation of the (O − C; observed minus computed) residuals of Phoebe is significantly improved after correcting the geometric distortions.