USA-94

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USA-94
Mission type Navigation
Operator US Air Force
COSPAR ID 1993-054A[1]
SATCAT no. 22779[1]
Mission duration 7.5 years (planned)[2]
19.6 years (achieved)
Spacecraft properties
Spacecraft type GPS Block IIA[2]
Manufacturer Rockwell[2]
Launch mass 1,816 kilograms (4,004 lb)[2]
Start of mission
Launch date 30 August 1993, 12:38:00 (1993-08-30UTC12:38Z) UTC
Rocket Delta II 7925-9.5, D222[3]
Launch site Cape Canaveral LC-17B[3]
End of mission
Disposal Placed in a graveyard orbit
Deactivated 10 June 2016 (2016-06-11)
Orbital parameters
Reference system Geocentric
Regime Medium Earth
(Semi-synchronous)
Perigee 20,109 kilometres (12,495 mi)[4]
Apogee 20,257 kilometres (12,587 mi)[4]
Inclination 54.8 degrees[4]
Period 718 minutes[4]

USA-94, also known as GPS IIA-13, GPS II-22 and GPS SVN-35, was an American navigation satellite which formed part of the Global Positioning System. It was the thirteenth of nineteen Block IIA GPS satellites to be launched.

USA-94 was launched at 12:38:00 UTC on 30 August 1993, atop a Delta II carrier rocket, flight number D222, flying in the 7925-9.5 configuration.[3] The launch took place from Launch Complex 17B at the Cape Canaveral Air Force Station,[5] and placed USA-94 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[2]

On 1 October 1993, USA-94 was in an orbit with a perigee of 20,109 kilometres (12,495 mi), an apogee of 20,257 kilometres (12,587 mi), a period of 718 minutes, and 54.8 degrees of inclination to the equator.[4] It broadcast the PRN 30 signal, and operated in slot 4, and later 5, of plane B of the GPS constellation.[6] The satellite had a mass of 1,816 kilograms (4,004 lb) and a design life of 7.5 years.[2] It was initially decommissioned on 26 March 2009 and then kept as a residual satellite.[7] SVN 35 was then recalled to replace SVN 30 in the active constellation on 16 August 2011.[8][9]

It was then decommissioned again on 1 May 2013, after almost 20 years in orbit,[10] and finally placed in a disposal orbit approximately 1000 km above the operational constellation and deactivated on 10 June 2016.[11]

References[edit]

  1. ^ a b "Navstar 2A-13". US National Space Science Data Center. Retrieved 10 July 2012. 
  2. ^ a b c d e f Krebs, Gunter. "GPS-2A (Navstar-2A)". Gunter's Space Page. Retrieved 10 July 2012. 
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 10 July 2012. 
  4. ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 10 July 2012. 
  5. ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 10 July 2012. 
  6. ^ Wade, Mark. "Navstar". Encyclopedia Astronautica. Retrieved 10 July 2012. 
  7. ^ "NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2009023". United States Coast Guard. Retrieved 23 June 2016. 
  8. ^ "NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2011062". United States Coast Guard. Retrieved 23 June 2016. 
  9. ^ "2SOPS Takes Over IIF-2, Moves to Replace SVN-30 with Spare". Inside GNSS. Retrieved 23 June 2016. 
  10. ^ "NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2013027". United States Coast Guard. Retrieved 3 May 2013. 
  11. ^ "Obituary: Farewell to SVN-35". United States Air Force. Retrieved 23 June 2016.