Alessandra Celletti, Luigi Chierchia Quasi-periodic attractors in celestial mechanics (578K, ps) ABSTRACT. We prove that KAM tori smoothly bifurcate into quasi-periodic attractors in dissipative mechanical models, provided external parameters are tuned with the frequency of the motion. An application to the dissipative spin-orbit model of celestial mechanics (which actually motivated the analysis in this paper) is presented.