Backward Lunar Gravity Assist

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

An assist mechanism during flight in the first and third quadrants where solar gravitational perturbation decreases the spacecraft's Jacobi energy and angular momentum while lowering the perigee altitude.

Application Value

该概念在轨道能量分析中用于量化航天器的能量状态，是评估转移方案经济性的重要指标。

Related Concepts

• Maximum-Energy Escape Trajectory
• Powered Escape Spiral
• Lunar Fly-by Method
• Reachability Set

References

• Wang 等 - 2025 - Mechanism analysis of the DRO low-energy transfer problem An energy perspective