OPS 5112

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 20056 km, an apogee of 20195 km, 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 kg. It broadcast the PRN 07 signal in the GPS demonstration constellation, and was retired from service in early-mid February 1988.