Extended Perilune Rendezvous Method, EPRM

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

A transfer method intermediate between IDT and WSB. After TLI and PLSB, the spacecraft enters an elliptical lunar orbit with a large semi-major axis and performs multiple small maneuvers to gradually adjust the orbit plane angle and perilune altitude before injecting into NRHO at perilune with a small velocity increment. EPRM trades longer transition time (19 to 37 days) for significant ΔV savings (from IDT's 390 m/s down to ~260 m/s), making it suitable for time-insensitive cargo missions. The paper presents four sub-types with progressively more maneuvers and adjusted timing to optimize ΔV.

Application Value

This concept has important application value in cislunar space research and mission design.

  • Earth-Moon Transfer Window
  • Lunar Orbit
  • Elliptical Lunar Frozen Orbit

References

  • Kikuchi et al., 2024
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Contributors: ouyangjiahong, Ou Yang Jiahong