OPS 5117

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
OPS 5117
Mission typeNavigation
OperatorUS Air Force
COSPAR ID1980-011A[1]
SATCAT no.11690[1]
Mission duration5 years (planned)
4 years (achieved)
Spacecraft properties
Spacecraft typeGPS Block I
Launch mass759 kilograms (1,673 lb)[2]
Start of mission
Launch date9 February 1980, 23:08 (1980-02-09UTC23:08Z) UTC
RocketAtlas E/F SGS-1, 35F[3]
Launch siteVandenberg SLC-3E[3]
End of mission
Deactivated11 May 1984 (1984-05-12)
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Perigee altitude20,144 kilometres (12,517 mi)[4]
Apogee altitude20,219 kilometres (12,564 mi)[4]
Inclination63.2 degrees[4]
Period717.94 minutes[4]

OPS 5117, also known as Navstar 5, GPS I-5 and GPS SVN-5, was an American navigation satellite launched in 1980 as part of the Global Positioning System development programme. It was the fifth of eleven Block I GPS satellites to be launched.[2]

OPS 5117 was launched at 23:08 UTC on 9 February 1980, atop an Atlas E/F carrier rocket with an SGS-1 upper stage. The Atlas used had the serial number 35F, 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 5117 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.[2]

By 12 March 1980, OPS 5117 had been raised to an orbit with a perigee of 20,144 kilometres (12,517 mi), an apogee of 20,219 kilometres (12,564 mi), a period of 717.94 minutes, and 63.2 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 05 signal in the GPS demonstration constellation, and was retired from service on 11 May 1984.


  1. ^ a b "Navstar 5". 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.