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USA-242
USA-242, also known as GPS IIF-4, GPS IIF SV-5 and Vega, is an American navigation satellite which was launched on 15 May 2013 and became operational on 21 June 2013.〔(【引用サイトリンク】title=NANU 2013035 )〕 The fourth Block IIF GPS satellite, it forms part of the Global Positioning System.
USA-242 is a spacecraft, built by Boeing with a design life of 15 years.〔 It operates from a semi-synchronous medium Earth orbit, at an altitude of an inclination of 55 degrees,〔 in slot 5 of plane C of the GPS constellation. The new satellite was originally intended to replace the seventeen-year-old USA-117 satellite, but currently both USA-117 (SVN-33) and USA-242 (SVN-66) are in active use.〔(【引用サイトリンク】title=GPS Constellation Status )〕 USA-242 broadcasts its navigation signals using the PRN-27 signal modulation.
United Launch Alliance conducted the launch of GPS IIF-4, using an Atlas V 401 carrier rocket. Launch took place from Space Launch Complex 41 at the Cape Canaveral Air Force Station, with liftoff occurring at 21:38 UTC on 15 May 2013, the beginning of an 18-minute launch window. The launch marked the first time since 1985 that a GPS satellite had launched on an Atlas rocket, or indeed any rocket other than a Delta.〔
==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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