|Operator||US Air Force|
|Mission duration||5 years (planned)|
10 years (achieved)
|Spacecraft type||GPS Block I|
|Launch mass||759 kilograms (1,673 lb)|
|Start of mission|
|Launch date||14 July 1983, 10:21UTC|
|Rocket||Atlas E/F SGS-2, 75E|
|Launch site||Vandenberg SLC-3W|
|End of mission|
|Deactivated||4 May 1993|
|Perigee altitude||19,924 kilometres (12,380 mi)|
|Apogee altitude||20,439 kilometres (12,700 mi)|
OPS 9794, also known as Navstar 8, GPS I-8 and GPS SVN-8, was an American navigation satellite launched in 1983 as part of the Global Positioning System development program. It was the eighth of eleven Block I GPS satellites to be launched.
OPS 9794 was launched at 10:21 UTC on 14 July 1983, atop an Atlas E/F carrier rocket with an SGS-2 upper stage. The Atlas used had the serial number 75E, and was originally built as an Atlas E. The launch took place from Space Launch Complex 3W at Vandenberg Air Force Base, and placed OPS 9794 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.
By 14 August 1983, OPS 9794 had been raised to an orbit with a perigee of 19,924 kilometres (12,380 mi), an apogee of 20,439 kilometres (12,700 mi), a period of 717.96 minutes, and 62.8 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 11 signal in the GPS demonstration constellation, and was retired from service on 4 May 1993.
- "Navstar 8". 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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