Atlas V 421 | NROL-52
Classified payload for the U.S. National Reconnaissance Office.
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 421 version uses a 4m wide fairing, 2 solid rocket boosters and one engine on the Centaur stage.
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Mission Profile
NROL-52 was a Atlas V 421 mission operated by United Launch Alliance that lifted off from Space Launch Complex 41, Cape Canaveral SFS, FL, USA on October 15, 2017. The flight carried its payload on a government/top secret mission to Geostationary Transfer Orbit. The launch was a success.