Preliminary results of solving the problem of geometric distortion for the 2.4 m telescope at Yunnan Observatory

Preliminary results of solving the problem of geometric distortion for the 2.4 m telescope at Yunnan Observatory
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云南天文台2.4 m望远镜几何畸变问题解决的初步成果

DOI:
10.1088/1674-4527/12/10/007
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发表时间:
2012-10
影响因子:
1.8
通讯作者:
朱紫
朱紫
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
张庆丰;彭青玉;朱紫

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2011年1月3日,我们利用云南天文台2.4米望远镜的云南暗天体摄谱仪和照相机对疏散星团NGC 1664(43张)和M35(42张)进行了观测,并采用我们最近提出的一种方法对它们进行了处理。结果表明,在视场中存在几何畸变效应,最大畸变为0.25″(即1个像素)。经过几何畸变校正后,星位测量精度得到了显著提高。对于曝光良好的恒星,每个方向的最佳精度为6 mas。
We observed the open clusters NGC 1664 (43 exposures) and M35 (42 exposures) by the Yunnan Faint Object Spectrograph and Camera in the 2.4 m telescope at Yunnan Astronomical Observatory on 2011 January 3, and processed them by a method recently proposed by us. The result shows that there is a geometric distortion effect in the field of view and the maximum distortion is ∼ 0.25″ (i.e. 1 pixel). After correcting the geometric distortion, the precision of stellar positional measurement is significantly improved. The best precision in each direction is 6 mas for well-exposed stars.
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