The purpose of this work was to develop escape trajectories from distant retrograde orbits in the Sun-Earth circular restricted three-body problem. Previous studies have suggested installing a space port outside the gravitational sphere of influence of Earth for future deep space exploration. This paper proposes the placement of a space port on a Sun-Earth distant retrograde orbit (SE-DRO), which is stable over a long period. The characteristics and fuel consumption efficiency of escape

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... ries from the space port on the SE-DRO using one or two impulses ΔV were investigated and compared with those obtained in previous studies that considered a space port located in the vicinity of the Sun-Earth L2 Lagrangian point. The connection of the escape trajectories from an SE-DRO with Earth gravity-assist (EGA) trajectories was then investigated based on the results of the analysis with the impulse ΔV. Finally, a series of trajectories from SE-DRO to EGA were shown to have a high efficiency from the perspective of both ΔV and the flight time.