Retrograde-Powered Lunar Gravity Assist

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

A gravity assist technique in which a spacecraft approaches the Moon in the retrograde direction (opposite to the Moon's orbital motion) and applies an impulse at perilune. Retrograde flybys provide larger turning angles, more effectively changing the orbital plane and energy, and are commonly used for DRO rendezvous missions. This technique can significantly reduce the total ΔV required to reach a distant retrograde orbit.

Application Value

This concept is fundamental to cislunar orbital mechanics and mission analysis, providing essential theoretical support for trajectory design and operational planning.

  • Retrograde Motion
  • Absolute Phase Bias
  • Relative Attitude Quaternion
  • Radial-Tangential-Normal Coordinate System, RTN

References

  • Peng et al. - 2024 - AIAA Journal of Spacecraft and Rockets, doi:10.2514/1.A35623; Murakami D. & Yamanaka K. - 2015 - IEEE Aerospace Conference
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Contributors: ouyangjiahong, Ou Yang Jiahong