This answer reminds us that an Earth-Moon L1 or L2 vanilla1 halo orbit remaining always visible to some patch on the Moon's surface requires station-keeping.
Queqiao uses such an orbit having continuous visibility with both Chang'e 4 on the Moon's far side and with Earth.
Question: Roughly how much station-keeping delta-v per year would be required for such an Earth-Moon halo orbit? This must have been worked out long ago, perhaps in "DoKaRoMo?"
note: For comparison, JWST will be in a vanilla halo orbit about the Sun-Earth L2 position and require only about 2.4 m/s per year for station-keeping! This is due to some clever balancing of solar radiation pressure and bi-weekly calculations and station-keeping maneuvers.
- What is the required burn to keep a satellite at a Lagrangian point?
- Could JWST stay at L2 "forever"?
- What happens to JWST after it runs out of propellant?
It's likely that an Earth-Moon halo orbit will require much more due to the Moon's eccentric and inclined orbit with respect to both Earth's equator and its orbital plane.
1vanilla meaning those proposed by Bob Farquhar (1, 2, 3, 4) and demonstrated numerically by Kathleen Connor Howell and not a near-rectilinear halo orbit (1, 2) or a butterfly orbit (3).
See also Farquhar, R. W.: "The Control and Use of Libration-Point Satellites", Ph.D. Dissertation, Dept. of Aeronautics and Astronautics, Stanford University, Stanford, California, 1968