Direct Transfer

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

A transfer trajectory from a low-Earth parking orbit to a Distant Retrograde Orbit using only two maneuvers: a departure burn and a DRO insertion burn. Operationally simple with controllable flight time (5 to 9 days), but typically requires more delta-v than powered lunar flybys. Most efficient for insertion angles near 180°.

Application Value

This term has application value in the design and analysis of cislunar space missions, supporting trajectory design, mission planning, and system optimization. Researchers can analyze its physical mechanisms and engineering applicability based on specific mission requirements to advance cislunar space exploration technology.

  • Orbit Insertion Point Condition
  • Hybrid Gravity Assist Transfer
  • Phase Angle of Perilune
  • Relative Periodic Orbit

References

  • Welch et al., 2015, Mission Considerations for Transfers to a Distant Retrograde Orbit
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Contributors: ouyangjiahong, Ou Yang Jiahong