Leaving the Moon by means of invariant manifolds of libration point orbits

The aim of this work is to look for rescue trajectories that leave the surface of the Moon, belonging to the hyperbolic manifolds associated with the central manifold of the Lagrangian points L1L1 and L2L2 of the Earth–Moon system. The model used for the Earth–Moon system is the Circular Restricted Three-Body Problem. We consider as nominal arrival orbits halo orbits and square Lissajous orbits around L1L1 and L2L2 and we show, for a given ΔvΔv, the regions of the Moon’s surface from which we can reach them. The key point of this work is the geometry of the hyperbolic manifolds associated with libration point orbits. Both periodic/quasi-periodic orbits and their corresponding stable invariant manifold are approximated by means of the Lindstedt–Poincaré semi-analytical approach.