OPS 5117

OPS 5117, also known as Navstar 5, GPS I-5 and GPS SVN-5, was an American navigation satellite launched in 1980 as part of the Global Positioning System development programme. It was the fifth of eleven Block I GPS satellites to be launched.

OPS 5117 was launched at 23:08 UTC on 9 February 1980, atop an Atlas E/F carrier rocket with an SGS-1 upper stage. The Atlas used had the serial number 35F, 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 5117 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.

By 12 March 1980, OPS 5117 had been raised to an orbit with a perigee of 20144 km, an apogee of 20219 km, a period of 717.94 minutes, and 63.2 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 05 signal in the GPS demonstration constellation, and was retired from service on 11 May 1984.