Maneuver design and implementation for the Mariner 9 mission

Orbit Trim Strategies for the 1975 Mars Viking Mission

“…However, in the flight operations, MOT2 and MOT3 may be performed at a specified point near but not at periapsis in order to achieve precise period control using a ground-based maneuver start command. 6 The fourth and final prelander-release trim is performed at the eleventh apoapsis after MOI to achieve accurate timing control of the separation orbit. This maneuver removes the timing error which accumulates during the 4^** orbits after MOT3.…”