Atlas V 551 Atlas V 551
NROL-107 (Silent Barker)
Mission

Classified space situational awareness (SSA) payload for the US National Reconnaissance Office (NRO).

Mission Type Government/Top Secret
Orbit Unknown
Atlas V 551
Atlas V 551

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.

Manufacturer United Launch Alliance
Thrust 12269kN
Length 59.7m
Diameter 3.8m
LEO Capacity 18850kg
GTO Capacity 8890kg
Launch Cost $153m
United Launch Alliance
United Launch Alliance

United Launch Alliance (ULA) is a joint venture of Lockheed Martin Space Systems and Boeing Defense, Space & Security. ULA was formed in December 2006 by combining the teams at these companies which provide spacecraft launch services to the government of the United States. ULA launches from both coasts of the US. They launch their Atlas V vehicle from LC-41 in Cape Canaveral and LC-3E at Vandeberg. Their Delta IV launches from LC-37 at Cape Canaveral and LC-6 at Vandenberg.

Type Commercial
Administrator CEO: Tory Bruno
Launch Vehicles Atlas | Delta IV | Vulcan
Spacecraft CST-100 Starliner
Space Launch Complex 41
Space Launch Complex 41
Location Cape Canaveral, FL, USA
Total Launches 107
Links Wikipedia | Map