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USA-128
USA-128, also known as GPS IIA-18, GPS II-27 and GPS SVN-30, is an American navigation satellite which forms part of the Global Positioning System. It was the eighteenth of nineteen Block IIA GPS satellites to be launched. USA-128 was launched at 08:49:00 UTC on 12 September 1996, atop a Delta II carrier rocket, flight number D238, flying in the 7925-9.5 configuration. The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station, and placed USA-128 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor. On 17 October 1996, USA-128 was in an orbit with a perigee of , an apogee of , a period of 717.94 minutes, and 54.7 degrees of inclination to the equator. It broadcasts the PRN 30 signal, and operates in slot 2 of plane B of the GPS constellation. The satellite has a mass of . It had a design life of 7.5 years,〔 and was decommissioned on July 20, 2011.〔(【引用サイトリンク】title=NANU 2011-048 )〕 ==References==
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