On the Motion of Trapped Particles in the Vicinity of Corotation Centers

In the present paper we analyse the motion of a massless particle during the capture process in an exterior mean-motion resonance under the effects of an external dissipative force. In particular, we study the orbital evolution from its initial approach to the commensurability up to the final nesting place in the periodic orbit around the equilibrium solution. This revised version was published online in July 2006 with corrections to the Cover Date.