A Block IIA GPS satellite
|Operator||US Air Force|
|Bus||GPS Block IIA|
|Launch date||12 September 1996, 08:49:00UTC|
|Carrier rocket||Delta II 7925-9.5 D238|
|Launch site||Cape Canaveral LC-17A|
|Mission duration||7.5 years (planned)|
|Mass||1,816 kilograms (4,000 lb)|
|Regime||Semisynchronous medium Earth|
|Apoapsis||20,305 kilometres (12,617 mi)|
|Periapsis||20,058 kilometres (12,463 mi)|
|Orbital period||717.94 minutes|
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 20,058 kilometres (12,463 mi), an apogee of 20,305 kilometres (12,617 mi), 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 1,816 kilograms (4,000 lb). It had a design life of 7.5 years, and was decommissioned on July 20, 2011.
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- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 11 July 2012.
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- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 11 July 2012.
- McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 11 July 2012.
- Wade, Mark. "Navstar". Encyclopedia Astronautica. Retrieved 10 July 2012.
- "NANU 2011-048". Celestrak. Retrieved 5 September 2012.
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