USA-92

USA-92, also known as GPS IIA-12, GPS II-21, GPS SVN-39, and NAVSTAR 39, is an American navigation satellite which forms part of the Global Positioning System. It was the twelfth of nineteen Block IIA GPS satellites to be launched.

USA-92 was launched at 13:27:00 UTC on 26 June 1993, atop a Delta II carrier rocket, flight number D221, 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-92 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.

On 27 July 1993, USA-92 was in an orbit with a perigee of 20120 km, an apogee of 20244 km, a period of 717.96 minutes, and 54.7 degrees of inclination to the equator. It broadcasts the PRN 09 signal, and operates in slot 1 of plane A of the GPS constellation. The satellite has a mass of 1816 kg. It had a design life of 7.5 years; however, it was kept in service for over 20 years before finally decommissioned from service on May 19, 2014.

Following decommissioning, it was subsequently placed in a disposal orbit approximately 1000km above the operational constellation on September 21, 2015.