USA-175

USA-175, also known as GPS IIR-10 and GPS SVN-47, is an American navigation satellite which forms part of the Global Positioning System. It was the tenth Block IIR GPS satellite to be launched, out of thirteen in the original configuration, and twenty one overall. It was built by Lockheed Martin, using the AS-4000 satellite bus.

USA-175 was launched at 08:05:00 UTC on 21 December 2003, atop a Delta II carrier rocket, flight number D302, flying in the 7925-9.5 configuration. The launch took place from Space Launch Complex 17A at the Cape Canaveral Air Force Station, and placed USA-175 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37FM apogee motor.

By 22 February 2004, USA-175 was in an orbit with a perigee of 20043 km, an apogee of 20319 km, a period of 717.92 minutes, and 55.1 degrees of inclination to the equator. It is used to broadcast the PRN 22 signal, and operates in slot 2 of plane E of the GPS constellation. The satellite has a mass of 2032 kg, and a design life of 10 years. As of 2012 it remains in service.