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Wasp-10b is a very interesting transiting extrasolar planet. Although itstransit is very deep, about 40 mmag, there are very different estimates of itsradius in the literature. We present new photometric observations of fourcomplete transits of this planet. The whole event was detected for each transitand the final light curve consists of more than 1500 individual CCD exposures.We determine the following system parameters: planet to star radius ratioR_p/R_star=0.168 +- 0.001, star radius to semimajor axis ratio R_star/a = 0.094+- 0.001 and inclination i=87.3 +- 0.1 deg. Assuming that the semimajor axis is0.036 9 +- ^{0.0012}_{0.0014} AU (Christian et al. 2009), we obtain thefollowing radius of the planet R_p=1.22 +- 0.05 R_J, and radius of the starR_star = 0.75 +- 0.03. The errors include the uncertainty in the stellar massand the semimajor axis of the planet. Surprisingly, our estimate of the planetradius is significantly higher (by about 12 percent) than the most recent valueof Johnson et al. (2009). We also improve the orbital period P_orb=3.092 731 +-1x10^{-6} days and estimate the average transit duration T_D=0.097 4 +-8x10^{-4} days.

Photometric observation of transiting extrasolar planet WASP - 10b