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根据对鬼星团中Ｊｏｈｎｓｏｎ测光标准星的观测，我们研究了北京天文台６０ｃｍ望远镜直流光电光度计ＵＢＶ测光系统的转换方程．应用该方程推算了对三颗变星观测得到的ＵＢＶ星等，讨论了所得光变曲线的精度，并与较差方法所得结果进行了比较
Based on the observations of the Johnson photometric standard stars in the cluster of ghost stars, we studied the conversion equations of the UBV photometric system of the 60cm telescope at Beijing Astronomical Observatory. Using this equation, the UBV magnitude obtained from the three variable stars was deduced. The accuracy of the obtained light curve was discussed and compared with the results obtained from the poor method