Space Tug

Agena
Automated Transfer Vehicle
Inertial Upper Stage
Orbital Maneuvering Vehicle

Separately funded study as part of the 1984 Space Station plan.

Orbital Transfer Vehicle
Shuttle-Centaur
Space Tug


In 1974, Lockheed received funding to examine the use of the Agena vehicle as a low(er) cost, lower (developmental) risk to the MSFC Space Tug.

Teleoperator Retrieval System
Transfer Orbit Stage

Notes

The Reusable Agena Study was conducted by the Lockheed Missiles and Space Company, Inc., for the National Aeronautics and Space Administration, George C. Marshall Space Flight Center (NASA/MSFC) under Contract NAS8-29952. It represents a comprehensive study effort to develop configuration, performance, and cost and schedule data for a Reusable Agena for consideration as an interim Space Tug vehicle.

(NASA-CR-120362) REUSABLE AGENA STUDY. VOLUME 2: TECHNICAL (Lockheed Missiles and Space Co.) 376 p HC $22.00 CSCL 22A.

References

Agena Target Vehicle, Wikipedia
Automated Transfer Vehicle, Astronautix
Inertial Upper Stage, Wikipedia
Orbital Maneuvering Vehicle, Astronautix
Orbital Transfer Vehicle, Astronautix