An Improved Distortion Solution for the Hubble Space Telescope’s WFPC2
An Improved Distortion Solution for the Hubble Space Telescope’s WFPC2
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DOI：
10.1086/345491
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发表时间：
2002
影响因子：
3.5
通讯作者：
Jay Anderson;I. King
中科院分区：
文献类型：
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作者：
Jay Anderson;I. King
精确的畸变校正对于使用宽视场行星相机2进行精确的天体测量至关重要。目前可用的解决方案在其线性项中具有严重的偏斜性质的系统误差（± 0.2像素）。我们利用ω Centauri的内定标场，找到了一种改进的三次解，在WF芯片上精度达到±0.01像素，在PC芯片上精度达到±0.02像素。除此之外的改进将是困难的，因为有许多因素会在0.01像素级别上干扰解决方案：呼吸，过滤器的变化以及芯片的物理移动。可能没有足够的可用数据将解决方案限制为优于0.01像素。尽管如此，我们的解决方案是一个重大的改进，将使许多天体测量项目获得接近最佳的结果。
Having an accurate distortion correction is critical to doing accurate astrometry with the Wide Field Planetary Camera 2. Currently available solutions have serious systematic errors (∼0.2 pixel) of a skewing nature in their linear terms. We use the inner calibration field of ω Centauri to find an improved cubic solution that is accurate to ±0.01 pixel in the WF chips and to ±0.02 pixel in the PC chip. Improvements beyond this will be difficult, as there are many factors that perturb the solution at the ∼0.01 pixel level: breathing, variations with filter, and the physical movement of the chips. There are probably not enough data available to constrain the solution to better than ∼0.01 pixel. Nevertheless, our solution is a major improvement and will allow many astrometric projects to obtain near‐optimal results.