The ultraviolet photolysis of jet-cooled mass-selected ketenyl radicals has been investigated using the technique of fast radical beam photofragment translational spectroscopy. The (C) over tilde(2) Pi((2)A ")-(X) over tilde(2)A " photofragment yield cross section spans 33400-48000 cm(-1) and exhibits resolved resonances and broad continua. Dissociation produces both ground and excited state CW radicals in association with ground state CO fragments; there is no evidence for H atom elimination. Analysis of the photofragment kinetic energy release spectra yield a value for the C-C bond dissociation energy and heat of formation of HCCO : D-0(HC-CO)=3.14+/-0.03 eV (72.4+/-0.7 kcal/mol) and Delta H-f,0(0)(HCCO)=1.82+/-0.03 eV (42.0+/-0.7 kcal/mol).