2000-2008年期间印度天文台的夜空
Night sky at the Indian Astronomical Observatory during 2000-2008
摘要：
我们提出了一个分析的光学夜空亮度和消光系数测量在UBVRI在印度天文台（IAO），汉勒，在2003-2008年期间。它们是通过对天文台2米喜马拉雅山钱德拉望远镜获得的CCD图像进行分析而获得的。夜空亮度是使用在47个夜晚获得的210张HFOSC图像估计的，这些图像覆盖了太阳活动周期23的下降阶段。无月夜空亮度的天顶校正值在等/平方角秒波段分别为22.14（U），22.42（B），21.28（V），20.54（R）和18.86（I）。这表明IAO是一个光学观测的暗站点。对58个夜晚的1325幅图像进行分析，得出了国际天文台的消光值。它们在U波段为0.36，在B波段为0.21，在V波段为0.12，在R波段为0.09，在I波段为0.05。平均而言，夏季的灭绝略大于冬季。没有发现所有波段的消光与夜间平均风速相关的明确证据，本文还提供了IAO的低分辨率无月光学夜空光谱，覆盖波长范围为3000-9300 nm。因此，汉勒地区在夜空亮度和消光方面具有良好天文学站点的必要特征，可以成为未来印度任何大口径光学红外望远镜的自然候选站点。
英文摘要：
We present an analysis of the optical night sky brightness and extinction coefficient measurements in UBVRI at the Indian Astronomical Observatory (IAO), Hanle, during the period 2003-2008. They are obtained from an analysis of CCD images acquired at the 2 m Himalayan Chandra Telescope at IAO. Night sky brightness was estimated using 210 HFOSC images obtained on 47 nights and covering the declining phase of solar activity cycle-23. The zenith corrected values of the moonless night sky brightness in mag/square arcsecs are 22.14(U), 22.42(B), 21.28(V), 20.54(R) and 18.86(I) band. This shows that IAO is a dark site for optical observations. No clear dependency of sky brightness with solar activity is found. Extinction values at IAO are derived from an analysis of 1325 images over 58 nights. They are found to be 0.36 in U-band, 0.21 in B-band, 0.12 in V-band, 0.09 in R-band and 0.05 in I-band. On average, extinction during the summer months is slightly larger than that during the winter months. No clear evidence for a correlation between extinction in all bands and the average night time wind speed is found. Also presented here is the low resolution moonless optical night sky spectrum for IAO covering the wavelength range 3000-9300 Å. Hanle region thus has the required characteristics of a good astronomical site in terms of night sky brightness and extinction, and could be a natural candidate site for any future large aperture Indian optical-infrared telescope(s).
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