SpaceX cargo ship aborts approach to station

A Russian Progress cargo ship bound for the International Space Station was successfully launched from Kazakhstan early Wednesday, but the approach of a SpaceX Dragon cargo ship launched Sunday from the Kennedy Space Center was aborted because of an apparent problem with the spacecraft’s GPS navigation system. SpaceX flight controllers suspect the abort might have been triggered by an incorrect “state vector,” the set of numbers that defines the spacecraft’s orbit and trajectory. If the problem can be resolved, the Dragon, loaded with nearly 5,500 pounds of supplies and equipment, could attempt a re-rendezvous Thursday morning. More

(Source: CBS News - Feb 22)