Mission type Navigation COSPAR ID 1989-085A Mission duration 7.5 years (planned) Inclination 54.7° Period 12 hours Launch mass 840 kg Rocket Delta II | Operator US Air Force SATCAT no. 20302 Spacecraft type GPS Block II Inclination 54.7° Launch mass 840 kg Launch date 21 October 1989 | |
USA-47, also known as GPS II-4 and GPS SVN-19, was an American navigation satellite which formed part of the Global Positioning System. It was the fourth of nine Block II GPS satellites to be launched, which were the first operational GPS satellites to fly.
USA-47 was launched at 09:31:01 UTC on 21 October 1989, atop a Delta II carrier rocket, flight number D188, flying in the 6925 configuration. The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station, and placed USA-47 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.
On 21 November 1989, USA-47 was in an orbit with a perigee of 20,081 kilometres (12,478 mi), an apogee of 20,280 kilometres (12,600 mi), a period of 717.9 minutes, and 54.7 degrees of inclination to the equator. It operated in slot 5 of plane A of the GPS constellation. The satellite had a mass of 840 kilograms (1,850 lb), and generated 710 watts of power. It had a design life of 7.5 years, and ceased operations on 11 September 2001.