基于BATC 1999-2008十年观测值班记录的兴隆天气情况统计

Statistics of Astronomical Observing Conditions at the Xinlong Station Based on the Observing Logs from 1999 to 2008

基于BATC巡天组近十年的观测值班记录,统计了兴隆观测站可观测时间随月份的变化,结果表明平均每年大约有195个可观测夜(约1986小时),其中大约有87个观测夜(约918小时)用来巡天,约有18个观测夜用来测光。另外还统计了兴隆观测站施密特望远镜十年来北极天区的观测图像中星像的半高全宽(FWHM)随月份的变化,结果表明一年内平均星像的半高全宽约为2.3像元(老CCD)或2.2像元(新CCD)。一般来说,夏季的星像要好于冬季,这与刘颖(Liu)等人2003年[1]的结果基本一致。

Based on the observing logs of the last ten years, we carried out the statistics of the monthly variations of times usable for observation at the Xinglong station. The results show that there were about 195 nights （about 1986 hours） available for observation in one year, among which about 87 nights （about 918 hours） were used for the BATC survey and about 18 nights are for photometric measurements. We also carried out the statistics of the monthly variations of FWHMs of the images of stars in the North Pole region observed by the 60/90 Schmidt telescope, and found that the mean FWHM within a year is about 2.3 pixels of the old CCD or 2. 2 pixels of the new CCD. Usually, star images are more clear in the summer than in the winter, which is consistent with the result of Liu 2003.