ИСТИНА

Catalina has detected a bright transient SDSS JJ162520+120308.7 which is a dwarf nova in the outburst, on July 05, 2010. We began to observe this object at July 8 using CCD camera with the 60cm telescope of Sternberg Astronomical Institute Crimean station. More than 700 measurements were obtained in R band which is show brightness variations in the light curve of this nova with a period of about 0.1d. These variations or superhumps evidence that SDSS J162520+120308.7 belong to the SU UMa-type dwarf novae and falls down to the gap on the period distribution of cataclysmic variables. Evolution of superhumps was followed up by our data. It was found from Fourier analysis that superhumps period change from 2.225 to 2.267 during our observations. Another period,- 0.0940d is also presented in the periodogram.