Viking type spacecraft rendezvous with the Martian moons.

The feasibility of a postlanding orbiter rendezvous with one or both of the Martian moons during a 1977 or 1979 follow-on Viking mission is investigated. Rendezvous is considered for two Viking trajectory options: landing from orbit and direct entry. Mission feasibility is demonstrated for launch by the Earth-to-orbit shuttle and by the Titan/Centaur booster. Required changes to the 1975 Viking hardware are outlined. Integrating the rendezvous into the ongoing Viking mission is shown to be a cost-effective approach.