A software glitch will delay a trial cargo ship from reaching the International Space Station until Tuesday.
The Cygnus capsule, which was launched by Orbital Sciences on Wednesday from Virginia for a test flight, had been scheduled to reach the station on Sunday.
However, about six hours before the capsule was due to dock, a computer software problem caused Cygnus to reject navigation data radioed from the station.
In a status report on its website on Sunday, Orbital Sciences wrote that the glitch temporarily halted Cygnus' approach to the station, a $US100 billion research complex about 400km above Earth.
Orbital Sciences said it had found the cause of the data discrepancy and was developing a software fix.
The next opportunity for the capsule to rendezvous and dock with the station will be on Tuesday.
Orbital Sciences is one of two companies hired by NASA to fly cargo to the space station since the retirement of the U.S. space shuttles in 2011.
The company is planning to make its first cargo run under a $US1.9 billion contract with NASA in December.
Space Exploration Technologies (SpaceX) has made a test flight and two resupply missions to the ISS so far.
