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Lunar cycler
A Lunar cycler or Earth-Moon cycler is a periodic orbit that passes close to both bodies repeatedly. If the propellant required to reach a particular cycler from the Earth and from the Moon is modest and the transit time between the two bodies along the cycler is reasonable, then having a spacecraft on the
cycler can provide an important component of an economical space transportation system. Cyclers may also be useful for navigation satellites (Satellite navigation).〔http://balsells.eng.uci.edu/docs/Mease-Progress-Report-June08.pdf〕
Cycler orbits are potentially useful for transporting people or materials using little propellant. Instead, they rely on gravity assist maneuvers to keep them going with occasional powered corrections (Orbital maneuver) to maintain the trajectory. These trajectories should have the characteristic that they can be easily targeted for either launch or destination planet and that the times between encounters yield a reasonable stay time on the destination and provide for both routine and emergency return on a fairly regular basis.〔http://cbboff.org/UCBoulderCourse/documents/LunarCyclerPaper.pdf〕
==History==
In 1985, Buzz Aldrin suggested the use of Cycler orbits (periodic trajectories that repeat the roundtrip transfer from home planet to destination planet) for the life support equipment and logistical supplies necessary for extensive manned exploration of the Moon and Mars (Mars cycler). He also presented his thoughts on the benefits of using Cycler spacecraft at the Space 88 Symposium in Albuquerque during a panel discussion on "Approaching the Construction Problems in Space.“ These trajectories must have the characteristic that they can be easily targeted for either launch or destination planet and that the times between encounters yield a reasonable stay time on the destination and provide for both routine and emergency return on a fairly regular basis.〔http://cbboff.org/UCBoulderCourse/documents/LunarCyclerPaper.pdf〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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