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USA-224
USA-224, also known as NRO Launch 49 (NRO L-49), is an American reconnaissance satellite which was launched in 2011. It is a KH-11 optical imaging satellite, the fifteenth such spacecraft to be launched, and intended as a replacement of the USA-161 satellite launched in 2001.
==Project history and cost==
After the failure of the Boeing led Future Imagery Architecture program in 2005, NRO ordered two additional legacy hardware KH-11s. Critics of the decision voiced concerns that each "exquisite-class" satellite would cost more than the latest Nimitz class aircraft carrier (CVN-77) with its projected procurement cost of US$ 6.35 billion as of May 2005. USA-224 - the first of these two - was completed by Lockheed US $ 2 billion under the initial budget estimate, and two years ahead of schedule.〔(【引用サイトリンク】date=2011-09-07 )〕
USA-224 was launched atop a Delta IV Heavy rocket from Space Launch Complex 6 at the Vandenberg Air Force Base 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 January 20, 2011 at 21:10:30 UTC. Upon reaching orbit, the satellite received the International Designator 2011-002A. The early launch of USA-224, and operational changes to extend the lifetime of its predecessor USA-161, reduced the coverage gap caused by the end of the primary mission of USA-161 to just 33 days.〔
Of 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, however amateur observers have identified it as being in a Low Earth orbit and tracked it. 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. As of it is in a orbit with inclination of degrees and an orbital period of minutes
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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