OPS 9794
| Mission type | Navigation Technology |
|---|---|
| Operator | US Air Force |
| COSPAR ID | 1983-072A[1] |
| SATCAT № | 14189[1] |
| Mission duration | 5 years (planned) 10 years (achieved) |
| Spacecraft properties | |
| Spacecraft type | GPS Block I |
| Manufacturer | Rockwell[2] |
| Launch mass | 759 kilograms (1,673 lb)[2] |
| Start of mission | |
| Launch date | 14 July 1983, 10:21 UTC |
| Rocket | Atlas E/F SGS-2, 75E[3] |
| Launch site | Vandenberg SLC-3W[3] |
| End of mission | |
| Deactivated | 4 May 1993 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Medium Earth (Semi-synchronous) |
| Perigee | 19,924 kilometres (12,380 mi)[4] |
| Apogee | 20,439 kilometres (12,700 mi)[4] |
| Inclination | 62.8 degrees[4] |
| Period | 717.96 minutes[4] |
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.[2]
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.[3] The launch took place from Space Launch Complex 3W at Vandenberg Air Force Base,[5] and placed OPS 9794 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.[2]
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.[4] The satellite had a design life of 5 years and a mass of 758 kilograms (1,671 lb).[2] It broadcast the PRN 11 signal in the GPS demonstration constellation, and was retired from service on 4 May 1993.
References
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