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arXiv 1211.4672astro-ph.IM
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盱眙观测站大气消光系数和夜空亮度

Atmospheric Extinction Coefficients and Night Sky Brightness At the Xuyi Observational Station

H. -H Zhang, X. -W. Liu, H. -B. Yuan, H. -B. Zhao, J. -S. Yao, H. -W. Zhang, M. -S. Xiang

摘要:

本文介绍了紫金山天文台(PMO)盱眙观测站光学宽带大气消光系数和夜空亮度的测量结果。这些测量是基于斯隆数字巡天g,r和i波段的CCD成像数据,使用盱眙1.04/1.20米施密特望远镜进行银河系反中心(XSTPS-GAC)的XSTPS-GAC,银河系反中心数字巡天(DSS-GAC)的测光部分。这些数据是在2009年至2011年的130多个冬夜收集的。我们发现,大气消光系数的g,r和i波段分别为0.70,0.55和0.38 mag/airmass,根据在几个测光夜的观测。由高质量图象测定的夜空亮度的中值分别为21.7、20.8和20.0 mag/arcsec ~ 2,在最佳观测条件下,g、r和i波段的夜空亮度分别为22.1、21.2和20.4 mag/arcsec ~ 2。与其他良好的天文观测站点相比,该站点的消光系数相对较大,主要是由于该站的海拔相对较低(即180米)和湿度较高。

英文摘要:

We present measurements of the optical broadband atmospheric extinction coefficients and the night sky brightness at the Xuyi Observational Station of Purple Mountain Observatory (PMO). The measurements are based on CCD imaging data taken in the Sloan Digital Sky Survey g, r and i bands with the Xuyi 1.04/1.20m Schmidt Telescope for the Xuyi Schmidt Telescope Photometric Survey of the Galactic Anti-center (XSTPS-GAC), the photometric part of the Digital Sky Survey of the Galactic Anti-center (DSS-GAC). The data were collected in more than 130 winter nights from 2009 to 2011. We find that the atmospheric extinction coefficients for the g, r and i bands are 0.70, 0.55 and 0.38 mag/airmass, respectively, based on observations taken in several photometric nights. The night sky brightness determined from images of good quality has median val- ues of 21.7, 20.8 and 20.0 mag/arcsec2 and reaches 22.1, 21.2 and 20.4 mag/arcsec2 under the best observing conditions for the g, r and i bands, respectively. The relatively large extinction coefficients compared with other good astronomical observing sites are mainly due to the relatively low elevation (i.e. 180 m) and high humidity of the Station.

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