Orbital Eccentricity and Angular Momentum Management Scheme Stability
enough to enable the estimation of (P0)3. This domain should not extend to infinity as four-impulse trajectories are necessary when (j) > 4n and optimal when T -» oo. A complete computation of (PO)3 and (PO)4 is called for to ascertain whether or not four impulses are sufficient in the nonlinear case. Such are the questions left open about impulsive rendezvous, to say nothing of the uniqueness of the solutions found, which, in spite of the present results, can be questioned.