USA-38
| Names | Navstar 2-02 GPS II-2 GPS SVN-13 |
|---|---|
| Mission type | Navigation |
| Operator | U.S. Air Force |
| COSPAR ID | 1989-044A |
| SATCAT no. | 20061 |
| Mission duration | 7.5 years (planned) 15 years (achieved) |
| Spacecraft properties | |
| Spacecraft | GPS II |
| Spacecraft type | GPS Block II[1] |
| Manufacturer | Rockwell International |
| Launch mass | 840 kg (1,850 lb) [2] |
| Dimensions | 5.3 m (17 ft) of long |
| Power | 710 watts |
| Start of mission | |
| Launch date | 10 June 1989, 22:19 UTC |
| Rocket | Delta II 6925-9.5 (Delta D185) [3] |
| Launch site | Cape Canaveral, LC-17A |
| Contractor | McDonnell Douglas |
| Entered service | July 1989 |
| End of mission | |
| Deactivated | 12 February 2004 |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Medium Earth orbit (Semi-synchronous) |
| Slot | B3 (slot 3 plane B) |
| Perigee altitude | 19,967 km (12,407 mi) |
| Apogee altitude | 20,395 km (12,673 mi) |
| Inclination | 54.5° |
| Period | 717.92 minutes |
USA-38, also known as GPS II-2 and GPS SVN-13, was an American navigation satellite which formed part of the Global Positioning System. It was the second of nine Block II GPS satellites to be launched, which were the first operational GPS satellites to be launched.
Background
It was part of the 21-satellite Global Positioning System (GPS) Block II series that provides precise position data (accurate to within 16 m) to military and civilian users worldwide. Its signals could be received on devices as small as a telephone. The GPS II satellites, built by Rockwell International for the Air Force Space Systems Division, each have a 7.5-year design life. The Air Force intends to launch a GPS II every two to three months until the constellation of 21 operational satellites and three spares is aloft. The GPS Block II joins seven operational Block 1 satellites.[2]
Launch
USA-38 was launched at 22:19 UTC on 10 June 1989, atop a Delta II launch vehicle, flight number D185, flying in the 6925-9.5 configuration.[3] The launch took place from Launch Complex 17A (LC-17A) at the Cape Canaveral Air Force Station (CCAFS),[4] and placed USA-38 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[1]
Mission
On 11 July 1989, USA-38 was in an orbit with a perigee of 19,967 km (12,407 mi), an apogee of 20,395 km (12,673 mi), a period of 717.92 minutes, and 54.5° of inclination to the equator.[5] It operated in slot 3 of plane B of the GPS constellation.[6] The satellite had a mass of 840 kg (1,850 lb), and generated 710 watts of power.[2] It had a design life of 7.5 years,[1] and was deactivated on 12 February 2004.
References
- ^ a b c Krebs, Gunter. "GPS-II". Gunter's Space Page. Retrieved 10 July 2012.
- ^ a b c "Display: Navstar 2-02 1989-044A". US National Space Science Data Center. NASA. Retrieved 10 July 2012.
This article incorporates text from this source, which is in the public domain.
- ^ a b McDowell, Jonathan. "Launch Log". Jonathan's Space Report. Retrieved 10 July 2012.
- ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Report. Archived from the original on 15 August 2020. Retrieved 10 July 2012.
- ^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Report. Retrieved 10 July 2012.
- ^ "NAVSTAR GPS - Summary". Space and Tech. Archived from the original on 15 June 2012. Retrieved 10 July 2012.