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This contribution investigates the properties of a category of orbits aroundEnceladus. In a previous investigation, a set of heteroclinic connections weredesigned between halo orbits around the equilibrium points L1 and L2 of thecircular restricted three-body problem with Saturn and Enceladus as primaries.The geometrical characteristics of those trajectories makes them goodcandidates as science orbits for the extended observation of the surface ofEnceladus: they are highly inclined, they approach the moon and they aremaneuver-free. However, the low heights above the surface and the strongperturbing effect of Saturn require a study of the influence of the polarflattening of the primaries. Therefore, those solutions are here reconsideredwith a dynamical model that includes the effect of the oblateness of Saturn andEnceladus, separately and in combination. The dynamical equivalents of the haloorbits around the equilibrium points L1 and L2 and their stable and unstablehyperbolic invariant manifolds are obtained in the perturbed models, andmaneuver-free heteroclinic connections are identified. A comparison with thecorresponding solutions of the unperturbed problem shows that qualitative andquantitative features are not significantly altered in the perturbed model. Theresults confirm the scientific value of the solutions obtained in the classicalcircular restricted three-body problem and suggests that the simpler model canbe used in a preliminary feasibility analysis.

Science orbits in the Saturn-Enceladus circular restricted three-body problem with oblate primaries