USA-135

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. The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station, and placed USA-135 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.

On 13 December 1997, USA-135 was in an orbit with a perigee of 19912 km, an apogee of 20449 km, a period of 717.9 minutes, and 54.9 degrees of inclination to the equator. It broadcasts the PRN 08 signal, and operates in slot 3 of plane A of the GPS constellation. The satellite has a mass of 1816 kg. It had a design life of 7.5 years, but it actually remained in service until October 30, 2014.