|Start of mission|
|Launch date||11 March 2011, 23:38UTC|
|Rocket||Delta IV-M+(4,2) D353|
|Launch site||Cape Canaveral SLC-37B|
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.
- Ray, Justin (11 April 2011). "Information-routing satellite was deployed by Delta 4". Spaceflight Now. Retrieved 24 April 2011.
- Wakelin, Peter (7 April 2011). "SATOBS 2011 April 06-07". SeeSat-L. Retrieved 24 April 2011.
- Ted, Molczan (9 April 2011). "NROL-27 / USA 227 elements". SeeSat-L. Retrieved 24 April 2011.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 24 April 2011.
- Ray, Justin. "Mission Status Center". Delta Mission Report. Spaceflight Now. Retrieved 24 April 2011.
|This article about one or more spacecraft of the United States is a stub. You can help Wikipedia by expanding it.|