A distortion solution for the Bok telescope with four CCD chips

A distortion solution for the Bok telescope with four CCD chips
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四CCD芯片Bok望远镜畸变解决方案

DOI:
10.1093/mnras/stz459
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发表时间:
2019-02
影响因子:
4.8
通讯作者:
Peng H W
Peng H W
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang N;Peng Q Y;Zhou X;Peng X Y;Peng H W

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北京-亚利桑那巡天(BASS)是一项成像巡天,使用位于基特峰的2.3米布克望远镜。为了挖掘博克望远镜的天文测量潜力,提高BASS的天文测量能力,对博克望远镜进行了畸变解算。在过去,我们使用一个查找表来纠正所有的位置错误。但是,对于装有4块CCD芯片的Bok望远镜,这种方法不能应用于观测的缩减。然后,与我们之前的方法完全不同的是,我们使用了两个三阶多项式来拟合查找表。采用多项式几何畸变(以下简称GD)校正,大大提高了BASS天文测量的精度。此外,发现一个额外的查找表更正对于获得最终的GD更有效。结果表明,合适亮星的位置测量精度估计在20 mas左右,在各个方向上甚至更好。此外,还测量了芯片的相对位置。2016 - 2017年间,芯片间水平或垂直间距变化不超过5个像素,滚转角变化不超过0.1度。
The Beijing-Arizona Sky Survey (BASS) is an imaging survey and uses the 2.3 m Bok telescope at Kitt Peak. In order to tap the astrometric potential of the Bok telescope and improve the astrometry of BASS, a distortion solution for the Bok telescope is made. In the past, we used a single lookup table to correct all the positional errors. However, this method can not be applied to the reduction of the observation for the Bok telescope where four CCD chips are equipped with. Then quite different from our previous method, two third-order polynomials were used to fit the lookup table. By using the polynomial Geometric Distortion (called GD hereafter) correction the astrometry of BASS is improved greatly. Moreover, an additional lookup table correction is found to be more effective to obtain a final GD. The results show that the positional measurement precision of the appropriate bright stars is estimated at about 20 mas and even better in each direction. Besides, the relative positions of the chips are measured. The change of the inter-chip gaps in horizontal or vertical is no more than 5 pixel between 2016 and 2017 and the change of the roll angle is no more than 0.1 degree.
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