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Trajectories that regularly encounter Earth and Mars but use small or no propulsive maneuvers are known as cycler trajectories, or cyclers. For cyclers that repeat after two Earth-Mars synodic periods, several variations are possible. A detailed investigation is presented of a simple two synodic period cycler, along with several promising variations using combinations of one-year and half-year phasing orbits. Analysis is included for both the circular coplanar model and a model with actual Earth and Mars ephemerides.

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