|Operator||US Air Force|
|Mission duration||5 years (planned)
4 years (achieved)
|Spacecraft type||GPS Block I|
|Launch mass||759 kilograms (1,673 lb)|
|Start of mission|
|Launch date||9 February 1980, 23:08UTC|
|Rocket||Atlas E/F SGS-1, 35F|
|Launch site||Vandenberg SLC-3E|
|End of mission|
|Deactivated||11 May 1984|
|Perigee||20,144 kilometres (12,517 mi)|
|Apogee||20,219 kilometres (12,564 mi)|
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.
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. The launch took place from Space Launch Complex 3E at Vandenberg Air Force Base, and placed OPS 5117 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.
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. The satellite had a design life of 5 years and a mass of 758 kilograms (1,671 lb). It broadcast the PRN 05 signal in the GPS demonstration constellation, and was retired from service on 11 May 1984.
- "Navstar 5". US National Space Science Data Center. Retrieved 25 June 2012.
- Krebs, Gunter. "GPS (Navstar)". Gunter's Space Page. Retrieved 12 July 2012.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 12 July 2012.
- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 12 July 2012.
- McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 12 July 2012.
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