OPS 5118

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OPS 5118
Mission typeNavigation
OperatorUS Air Force
COSPAR ID1980-032A[1]
SATCAT no.11783[1]
Mission duration5 years (planned)
11 years (achieved)
Spacecraft properties
Spacecraft typeGPS Block I
Launch mass759 kilograms (1,673 lb)[2]
Start of mission
Launch date26 April 1980, 22:00 (1980-04-26UTC22Z) UTC
RocketAtlas E/F SGS-1, 34F[3]
Launch siteVandenberg SLC-3E[3]
End of mission
Deactivated6 March 1991 (1991-03-07)
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Perigee altitude20,006 kilometres (12,431 mi)[4]
Apogee altitude20,357 kilometres (12,649 mi)[4]
Inclination62.8 degrees[4]
Period717.94 minutes[4]

OPS 5118, also known as Navstar 6, GPS I-6 and GPS SVN-6, was an American navigation satellite launched in 1980 as part of the Global Positioning System development programme. It was the sixth of eleven Block I GPS satellites to be launched.[2]

OPS 5118 was launched at 22:00 UTC on 26 April 1980, atop an Atlas E/F carrier rocket with an SGS-1 upper stage. The Atlas used had the serial number 34F, and was originally built as an Atlas F.[3] The launch took place from Space Launch Complex 3E at Vandenberg Air Force Base,[5] and placed OPS 5118 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.[2]

By 27 May 1980, OPS 5118 had been raised to an orbit with a perigee of 20,006 kilometres (12,431 mi), an apogee of 20,357 kilometres (12,649 mi), a period of 717.94 minutes, and 62.8 degrees of inclination to the equator.[4] The satellite had a design life of 5 years and a mass of 758 kilograms (1,671 lb).[2] It broadcast the PRN 09 signal in the GPS demonstration constellation, and was retired from service on 6 March 1991.


  1. ^ a b "Navstar 6". US National Space Science Data Center. Retrieved 25 June 2012.
  2. ^ a b c d e Krebs, Gunter. "GPS (Navstar)". Gunter's Space Page. Retrieved 12 July 2012.
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 12 July 2012.
  4. ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 12 July 2012.
  5. ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 12 July 2012.