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Template:Infobox spaceflight USA-71, also known as GPS IIA-2, GPS II-11 and GPS SVN-24, is an American navigation satellite which forms part of the Global Positioning System. It was the second of nineteen Block IIA GPS satellites to be launched.

USA-71 was launched at 02:32:00 UTC on 4 July 1991, atop a Delta II carrier rocket, flight number D206, flying in the 7925-9.5 configuration.[1] The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station,[2] and placed USA-71 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[3]

On 14 August 1991, USA-71 was in an orbit with a perigee of 20,085 kilometres (Template:Convert/round mi), an apogee of 20,274 kilometres (Template:Convert/round mi), a period of 717.86 minutes, and 55.1 degrees of inclination to the equator.[4] It has PRN 24, and operated in slot 1 of plane D of the GPS constellation[5] until it was removed from service in September 2009. It was subsequently relocated, was operational again, briefly covering slot 2 in 2011, before being deactivated in November after USA-232 replaced it. It began transmitting navigation signals again in March 2012; however, it is not currently part of the operational GPS constellation.[6] The satellite has a mass of 1,816 kilograms (Template:Convert/round lb), and a design life of 7.5 years.[3]

ReferencesEdit

  1. McDowell, Jonathan. "Launch Log". Jonathan's Space Page. http://planet4589.org/space/log/launchlog.txt. Retrieved 10 July 2012. 
  2. McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. http://planet4589.org/space/lvdb/list2.html. Retrieved 10 July 2012. 
  3. 3.0 3.1 Krebs, Gunter. "GPS-2A (Navstar-2A)". Gunter's Space Page. http://space.skyrocket.de/doc_sdat/navstar-2a.htm. Retrieved 10 July 2012. 
  4. McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. http://planet4589.org/space/log/satcat.txt. Retrieved 10 July 2012. 
  5. Wade, Mark. "Navstar". Encyclopedia Astronautica. http://www.astronautix.com/project/navstar.htm. Retrieved 10 July 2012. 
  6. "NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012018". US Air Force. https://gps.afspc.af.mil/gps/archive/2012/NANUS/2012018.nnu. Retrieved 10 July 2012. 
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