Template:Infobox spaceflight USA-135, also known as GPS IIA-19, GPS II-28 and GPS SVN-38, is an American navigation satellite which forms part of the Global Positioning System. It was the last of nineteen Block IIA GPS satellites to be launched.

USA-135 was launched at 00:30:00 UTC on 6 November 1997, atop a Delta II carrier rocket, flight number D249, flying in the 7925-9.5 configuration.[1] The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station,[2] and placed USA-135 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[3]

On 13 December 1997, USA-135 was in an orbit with a perigee of 19,912 kilometres (Template:Convert/round mi), an apogee of 20,449 kilometres (Template:Convert/round mi), a period of 717.9 minutes, and 54.9 degrees of inclination to the equator.[4] It broadcasts the PRN 08 signal, and operates in slot 3 of plane A of the GPS constellation.[5] The satellite has a mass of 1,816 kilograms (Template:Convert/round lb). It had a design life of 7.5 years,[3] but it actually remained in service until October 30, 2014.


  1. McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 11 July 2012. 
  2. McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 11 July 2012. 
  3. 3.0 3.1 Krebs, Gunter. "GPS-2A (Navstar-2A)". Gunter's Space Page. Retrieved 10 July 2012. 
  4. McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 11 July 2012. 
  5. Wade, Mark. "Navstar". Encyclopedia Astronautica. Retrieved 10 July 2012. 
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