Atlas V 551 | MUOS-4
MUOS-4 is the fourth in a Lockheed Martin-built, five-ship fleet for a next-generation, narrowband tactical military satellite communications system.
Atlas V is an expendable launch system in the Atlas rocket family. It was formerly operated by Lockheed Martin and is now operated by United Launch Alliance (ULA), a joint venture with Boeing. Each Atlas V rocket uses a Russian-built RD-180 engine burning kerosene and liquid oxygen to power its first stage and an American-built RL10 engine burning liquid hydrogen and liquid oxygen to power its Centaur upper stage. The RD-180 engines are provided by RD Amross, while Aerojet Rocketdyne provides both the RL10 engines and the strap-on boosters used in some configurations. The standard payload fairing sizes are 4 or 5 meters in diameter and of various lengths. Fairings sizes as large as 7.2 m in diameter and up to 32.3 m in length have been considered. The rocket is assembled in Decatur, Alabama and Harlingen, Texas.
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Mission Profile
MUOS-4 was a Atlas V 551 mission operated by United Launch Alliance that lifted off from Space Launch Complex 41, Cape Canaveral SFS, FL, USA on September 2, 2015. The flight carried its payload on a government/top secret mission to Geostationary Transfer Orbit. The launch was a success.