Prograde in Perigee and Retrograde in Perilune

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

A classification of trans-lunar trajectories by orbital direction: the spacecraft moves prograde (same as Earth's rotation) in the geocentric segment and retrograde (opposite to Moon's revolution) near the Moon. Free-return trajectories for crewed lunar missions typically use this type.

Application Value

在设计地月转移方案时，利用该轨道特性可降低任务总速度增量需求。

References

  • 彭坤 等 - 2018 - 三体模型下二维平面地月转移轨道设计与特性分析
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Contributors: ouyangjiahong, Ou Yang Jiahong