|Operator||US Air Force|
|Mission duration||5 years (planned)|
9 1⁄2 years (achieved)
|Spacecraft type||GPS Block I|
|Launch mass||759 kilograms (1,673 lb)|
|Start of mission|
|Launch date||13 May 1978, 10:34UTC|
|Rocket||Atlas E/F SGS-1, 49F|
|Launch site||Vandenberg SLC-3E|
|End of mission|
|Perigee altitude||20,056 kilometres (12,462 mi)|
|Apogee altitude||20,195 kilometres (12,549 mi)|
OPS 5112, also known as Navstar 2, NDS-2, GPS I-2 and GPS SVN-2, was an American navigation satellite launched in 1978 as part of the Global Positioning System development programme. It was the second of eleven Block I GPS satellites to be launched.
OPS 5112 was launched at 10:34 UTC on 13 May 1978, atop an Atlas E/F carrier rocket with an SGS-1 upper stage. The Atlas used had the serial number 49F, 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 5112 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.
By 20 June 1978, OPS 5112 was in an orbit with a perigee of 20,056 kilometres (12,462 mi), an apogee of 20,195 kilometres (12,549 mi), a period of 715.67 minutes, and 63.1 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 07 signal in the GPS demonstration constellation, and was retired from service in early-mid February 1988.
- "Navstar 2". 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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