月球探测器发射机会分析

发射月球探测器实际上是使探测器与月球交会的问题，由于月球位置的变化，选择不同的交会日期相应的地月转移轨道是不相同的。文章分析了月球在一个恒星月内位置变化与相应的地月转移轨道升交点赤经和近地点幅角变化的关系，在这个基础上讨论了发射机会和发射窗口问题。

Launch Opportunity Analysis for Lunar Probe

To launch a lunar probe is actually a problem of rendezvous between the probe and the Moon. Since the positions of the Moon vary the lunar trajectories are different for different times of rendezvous. The relation of the right ascension and argument of perigee of the required orbit with the lunar position is derived within one lunar month. Based on this relationship the launch opportunity and launch window are discussed.