Oldest GPS navigation satellite to be retired with next launch

A new Global Positioning System craft will ride a United Launch Alliance Atlas 5 rocket into orbit next month to replace a satellite that has operated in space for 25 years. Stacking of the two-stage launcher for ULA’s first mission of 2016 began this morning at Cape Canaveral’s Vertical Integration Facility next to Complex 41. Liftoff is planned for Feb. 3 during a morning launch window of 8:47 to 9:05 a.m. EST (1347-1405 GMT). The three-and-a-half hour rocket flight will deliver the payload 11,000 nautical miles above Earth. More

(Source: SpaceFlight Now - Jan 12)