Unpowered Lunar Gravity Assist, Unpowered LGA

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

A flyby technique relying solely on the lunar gravitational field to alter orbital parameters without applying thrust. Enables velocity magnitude and direction changes, including substantial orbit plane reorientation, without propellant expenditure.

Application Value

This concept plays an important role in trajectory optimization and mission planning applications.

Related Concepts

• Minimum-Time Trajectory
• Orbit Maintenance Cost

References

• Shi et al. (2025)