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The variability amplitudes for most of nights are less than 10\\% and four nights more than 20\\%. When considering the nights with time spans $>4$ hours, the value of duty cycle (DC) is 14.17 per cent. Over the twelve years, the overall magnitude and color index variabilities are $\\bigtriangleup I=0^{\\rm m}.67$, $\\bigtriangleup R=0^{\\rm m}.72$, $\\bigtriangleup V=0^{\\rm m}.68$, and $\\bigtriangleup (V-R)=0^{\\rm m}.25$ respectively. 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