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ROTSE1 J164341.65+251748.1 was photometrically observed in the V band duringthree epochs with the 0.84-m telescope of the San Pedro M\'artir Observatory inMexico. Based on additional BVR photometry, we find that the primary star has aspectral type around G0V. The light curve of the system is typical of a W~UMatype binary stars and has an orbital period of $\sim$ 0.323 days. In an effortto gain a better understanding of the binary system and determine its physicalproperties, we analyzed the light curve with the Wilson and Devinney method. Wefound that ROTSE1 J164341.65+251748.1 has a mass ratio of $\sim$ 0.34 and thatthe less massive component is over 230 K hotter than the primary star. Theinclination of the system is $\sim$ 84.6 degrees, and the {\bf degree} ofover-contact is 11\%. The analysis shows the presence of variable bright spotson the primary star.

ROTSE1 J164341.65+251748.1: a new W UMa-type eclipsing binary