USA-224
USA-224, also known as NROL-49, is an American reconnaissance satellite. Launched in 2011 to replace the decade-old USA-161 satellite, it is the fifteenth KH-11 optical imaging satellite to reach orbit.
Project history and cost
After the Boeing-led Future Imagery Architecture program failed in 2005, the National Reconnaissance Office ordered two more KH-11s. Critics worried that each of these "exquisite-class" satellites would cost more than the Navy's latest aircraft carrier. Instead, USA-224–the first of these two–was completed by Lockheed under the initial budget estimate and two years ahead of schedule.Launch
USA-224 was launched atop a Delta IV Heavy rocket from Vandenberg AFB [Space Launch Complex 6] in California. The launch was conducted by United Launch Alliance, and was the first flight of a Delta IV Heavy from Vandenberg. Liftoff occurred on 20 January 2011 at 21:10:30 UTC. Upon reaching orbit, the satellite received the International Designator 2011-002A.The satellite began operating 33 days after its predecessor, USA-161, stopped doing its primary mission. This coverage gap was much smaller than originally feared, thanks to USA-224's earlier-than-planned launch and operational changes to extend the lifetime of USA-161.
As the fifteenth KH-11 satellite to be launched, USA-224 is a member of one of the later block configurations occasionally identified as being a separate system. Details of its mission and orbit are classified, but amateur observers have tracked it in low Earth orbit. Shortly after launch it was in an orbit with a perigee of, an apogee of and 97.9 degrees of inclination, typical for an operational KH-11 satellite. By April it was at 97.93 degrees.