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Gemini Multi Object Spectrograph medium-resolution spectra and photometricdata of 39 objects in the field of the radio galaxy 3C 17 are presented. Basedon the new data, a previously uncataloged cluster of galaxies is identified ata mean redshift of z=0.220 +/-0.003, a projected virial radius of 0.37 Mpc, anda velocity dispersion of sigma_v = 821 +/-171 km/s. The brightest member ofthis cluster is 3C 17 with M_r = -22.45 mag. The surface brightness profile of3C 17 is best fit with two components (Exponential + Sersic) characteristic ofbrightest cluster galaxies. The spectrum of 3C 17 is dominated by broademission lines Halpha + N[II] and Hbeta + [OIII]. Analysis of Chandra datashows extended emission around the cluster core that supports the existence ofhot gas cospatial with 3C 17. The discovery of a cluster of galaxies around 3C17 better explains the sharply bent morphology of the radio jet given that itpropagates through a dense intracluster medium.

3C 17: The BCG of a galaxy cluster at z=0.22