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We report high-precision transit photometry for the recently detected planetHD 17156b. Using these new data with previously published transit photometryand radial velocity measurements, we perform a combined analysis based on aMarkov Chain Monte Carlo approach. The resulting mass M_p = 3.09 (+0.22-0.17)M_Jup and radius R_p = 1.23 (+0.17-0.20) R_Jup for the planet places it at theouter edge of the density distribution of known transiting planets with rho_p =1.66 (+1.37-0.60) rho_Jup. The obtained transit ephemeris is T_tr =2454438.48271 (+0.00077-0.00057) + N x 21.21747 (+0.00070-0.00067) BJD. Thederived plausible tidal circularization time scales for HD 17156b are largerthan the age of the host star. The measured high orbital eccentricity e =0.6719 (+0.0052-0.0063) can thus not be interpreted as the clear sign of thepresence of another body in the system.

Improved parameters for the transiting planet HD 17156b: a high-density giant planet with a very eccentric orbit