Centaur for the 1980s

The characteristics, planned performance improvements, and launch schedules of the Centaur, the world's only operational high energy upper stage, are discussed. A 100% success rate on 36 missions since 1971 is reported, using liquid O2 and H2 fueled dual RL-10 engines, each rated at 16,500 lbs. thrust. The Centaur astrionics system computer unit has a high speed, 16,000 word memory and extensive input-output capabilities. Atlas first stages will be used for the launches of three Intelsat V-A satellites in 1983, with a baseline payload of 4,900 lbs., to be increased to 5,300 lbs. Strap-on boosters enable the launch of two 2,800 lb. spacecraft on a single Atlas/Centaur. Current modifications required for integration with the Shuttle are interface compatibility and safety considerations, changes totaling 5% for fitting into the Shuttle bay along with the Galileo probe. A Shuttle/Centaur will have a geosynchronous capability of 14,500 lb., and a launch date in 1985 is targeted.