USA-84
| Mission type | Navigation |
|---|---|
| Operator | US Air Force |
| COSPAR ID | 1992-058A[1] |
| SATCAT no. | 22108[1] |
| Mission duration | 7.5 years (planned)[2] |
| Spacecraft properties | |
| Spacecraft type | GPS Block IIA[2] |
| Manufacturer | Rockwell[2] |
| Launch mass | 1,816 kilograms (4,004 lb)[2] |
| Start of mission | |
| Launch date | 9 September 1992, 08:57:00 UTC |
| Rocket | Delta II 7925-9.5, D214[3] |
| Launch site | Cape Canaveral LC-17A[3] |
| End of mission | |
| Disposal | Placed in a graveyard orbit |
| Deactivated | 18 April 2017, 22:00:00 UTC |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Medium Earth (Semi-synchronous) |
| Perigee altitude | 19,914 kilometres (12,374 mi)[4] |
| Apogee altitude | 20,451 kilometres (12,708 mi)[4] |
| Inclination | 54.7 degrees[4] |
| Period | 717.98 minutes[4] |
USA-84, also known as GPS IIA-6, GPS II-15 and GPS SVN-27, is an American navigation satellite which forms part of the Global Positioning System. It was the sixth of nineteen Block IIA GPS satellites to be launched.
USA-84 was launched at 08:57:00 UTC on 9 September 1992, atop a Delta II carrier rocket, flight number D214, flying in the 7925-9.5 configuration.[3] The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station,[5] and placed USA-84 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[2]
On 11 October 1992, USA-84 was in an orbit with a perigee of 19,914 kilometres (12,374 mi), an apogee of 20,451 kilometres (12,708 mi), a period of 717.98 minutes, and 54.7 degrees of inclination to the equator.[4] It had PRN 27, and operated in slot 4 of plane A of the GPS constellation.[6] The satellite has a mass of 1,816 kilograms (4,004 lb). It had a design life of 7.5 years,[2] but was in service for twenty years, until its retirement in October 2012. It was then kept as an on orbit residual spare until its disposal in 2017, where it was placed in a disposal orbit approximately 1000km above the operational constellation.[7]
References
- ^ a b "Navstar 2A-06". US National Space Science Data Center. Retrieved 10 July 2012.
- ^ a b c d e f Krebs, Gunter. "GPS-2A (Navstar-2A)". Gunter's Space Page. Retrieved 10 July 2012.
- ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 10 July 2012.
- ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 10 July 2012.
- ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 10 July 2012.
- ^ Wade, Mark. "Navstar". Encyclopedia Astronautica. Retrieved 10 July 2012.
- ^ "U.S. Air Force says goodbye to 25-year-old GPS satellite". GPS World. Retrieved 7 May 2020.
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