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A Block IIR GPS satellite
Mission type Navigation
Operator US Air Force
COSPAR ID 2000-025A[1]
SATCAT no. 26360[1]
Mission duration 10 years (planned)[2]
Spacecraft properties
Spacecraft type GPS Block IIR[2]
Bus AS-4000[2]
Manufacturer Lockheed Martin[2]
Launch mass 2,032 kilograms (4,480 lb)[2]
Start of mission
Launch date 11 May 2000, 01:48:00 (2000-05-11UTC01:48Z) UTC
Rocket Delta II 7925-9.5, D278[3]
Launch site Cape Canaveral SLC-17A[3]
Orbital parameters
Reference system Geocentric
Regime Medium Earth
Perigee 20,133 kilometres (12,510 mi)[4]
Apogee 20,234 kilometres (12,573 mi)[4]
Inclination 54.9 degrees[4]
Period 718.02 minutes[4]

USA-150, also known as GPS IIR-4 and GPS SVN-51, is an American navigation satellite which forms part of the Global Positioning System. It was the fourth 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.[2]

USA-150 was launched at 01:48:00 UTC on 11 May 2000, atop a Delta II carrier rocket, flight number D278, flying in the 7925-9.5 configuration.[3] The launch took place from Space Launch Complex 17A at the Cape Canaveral Air Force Station,[5] and placed USA-150 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37FM apogee motor.[2]

By 11 June 2000, USA-150 was in an orbit with a perigee of 20,133 kilometres (12,510 mi), an apogee of 20,234 kilometres (12,573 mi), a period of 718.02 minutes, and 54.9 degrees of inclination to the equator.[4] It is used to broadcast the PRN 20 signal, and operates in slot 1 of plane E of the GPS constellation, having replaced USA-35, the first operational GPS satellite.[6] The satellite has a mass of 2,032 kilograms (4,480 lb), and a design life of 10 years.[2] As of 2012 it remains in service.


  1. ^ a b "Navstar 47". 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. 
  6. ^ Wade, Mark. "Navstar". Encyclopedia Astronautica. Retrieved 11 July 2012.