A Block IIR GPS satellite
Mission typeNavigation
OperatorUS Air Force
COSPAR ID2004-045A[1]
SATCAT no.28474[1]
Mission duration10 years (planned)[2]
Spacecraft properties
Spacecraft typeGPS Block IIR[2]
ManufacturerLockheed Martin[2]
Launch mass2,032 kilograms (4,480 lb)[2]
Start of mission
Launch date6 November 2004, 05:39:00 (2004-11-06UTC05:39Z) UTC
RocketDelta II 7925-9.5, D308[3]
Launch siteCape Canaveral SLC-17B[3]
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Perigee altitude19,936 kilometres (12,388 mi)[4]
Apogee altitude20,426 kilometres (12,692 mi)[4]
Inclination54.8 degrees[4]
Period717.94 minutes[4]

USA-180, also known as GPS IIR-13 and GPS SVN-61, is an American navigation satellite which forms part of the Global Positioning System. It was the thirteenth of twenty one Block IIR GPS satellites to be launched, and the last in the original configuration. It was built by Lockheed Martin, using the AS-4000 satellite bus.[2]

USA-180 was launched at 05:39:00 UTC on 6 November 2004, atop a Delta II carrier rocket, flight number D308, flying in the 7925-9.5 configuration.[3] The launch took place from Space Launch Complex 17B at the Cape Canaveral Air Force Station,[5] and placed USA-180 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37FM apogee motor.[2]

By 5 January 2005, USA-180 was in an orbit with a perigee of 19,936 kilometres (12,388 mi), an apogee of 20,426 kilometres (12,692 mi), a period of 717.94 minutes, and 54.8 degrees of inclination to the equator.[4] It is used to broadcast the PRN 02 signal, and operates in slot 1 of plane D of the GPS constellation. The satellite has a mass of 2,032 kilograms (4,480 lb), and a design life of 10 years.[2] As of 2019 it remains in service.


  1. ^ a b "Navstar 56". US National Space Science Data Center. Retrieved 11 July 2012.
  2. ^ a b c d e f g h Krebs, Gunter. "GPS-2R (Navstar-2R)". Gunter's Space Page. Retrieved 11 July 2012.
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 11 July 2012.
  4. ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 11 July 2012.
  5. ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 11 July 2012.