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USA-227
USA-227, known before launch as NRO Launch 27 (NROL-27), is an American communications satellite which was launched in 2011. It is operated by the United States National Reconnaissance Office.
Whilst details of its mission are officially classified, amateur observers have identified USA-227 as being a third-generation Satellite Data System satellite in geosynchronous orbit. The first amateur observation of the satellite was made on 6 April 2011, when the spacecraft was located at a longitude of 30.4 degrees west.〔 SDS satellites are used to relay data from American reconnaissance satellites to ground stations.
United Launch Alliance performed the launch of USA-227, using a Delta IV-M+(4,2) carrier rocket flying from Space Launch Complex 37B at the Cape Canaveral Air Force Station. The launch occurred at 23:38 UTC on 11 March 2011. Following liftoff the rocket flew east, placing the satellite into a geosynchronous transfer orbit. By 23:43 UTC, official updates on the status of the launch had been discontinued.
==References==
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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