OPS 5113

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OPS 5113
Mission typeNavigation
OperatorUS Air Force
COSPAR ID1978-093A[1]
SATCAT no.11054[1]
Mission duration5 years (planned)
13 12 years (achieved)
Spacecraft properties
Spacecraft typeGPS Block I
Launch mass759 kilograms (1,673 lb)[2]
Start of mission
Launch date7 October 1978, 00:28 (1978-10-07UTC00:28Z) UTC
RocketAtlas E/F SGS-1, 47F[3]
Launch siteVandenberg SLC-3E[3]
End of mission
Deactivated18 May 1992 (1992-05-19)
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Perigee altitude20,181 kilometres (12,540 mi)[4]
Apogee altitude20,186 kilometres (12,543 mi)[4]
Inclination62.8 degrees[4]
Period718.02 minutes[4]

OPS 5113, also known as Navstar 3, GPS I-3 and GPS SVN-3, was an American navigation satellite launched in 1978 as part of the Global Positioning System development programme. It was the third of eleven Block I GPS satellites to be launched.[2]


OPS 5113 was launched at 00:28 UTC on 7 October 1978, atop an Atlas E/F carrier rocket with an SGS-1 upper stage. The Atlas used had the serial number 47F, 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 5113 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.[2]


By 8 November 1978, OPS 5113 was in an orbit with a perigee of 20,181 kilometres (12,540 mi), an apogee of 20,186 kilometres (12,543 mi), a period of 718.02 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 06 signal in the GPS demonstration constellation, and was retired from service on 18 May 1992.

See also[edit]


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