= Cycler Orbits =

Mars missions can be assembled in high circular orbits far beyond the Moon, where the delta V from a high perigee launch loop ellipse is small.  That delta V can be reversed to drop back to a low perigee for a rendezous with a Mars Cycler orbit.

== Mars Cycler ==

 . A SYSTEMATIC METHOD FOR CONSTRUCTING EARTH-MARS CYCLERS USING DIRECT RETURN TRAJECTORIES [[ attachment:10.1.1.706.5302.pdf | Russell and Ocampo ]]