For capture to a 200-km circular orbit around Europa, millions of different starting points onthe orbit are propagated in the Jupiter-Europa Restricted 3-Body Problem. The transfers existas members of families of trajectories, where certain families consistently outperform theothers. The trajectories are not sensitive to changes in inclination for the final circular orbit.The top-performing trajectories appear to follow the invariant manifolds of L2 Lyapunovorbits for capture into a retrograde orbit, and in some cases save up to 40% of theΔv from thepatched 2-body problem. Transfers are attached to the current nominal mission for NASA’sJupiter-Europa Orbiter, where the total cost is roughly 100 m/s less than the baseline mission.
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