The liftoff is scheduled for
The mission, named Orb-2, is the second official trip for Orbital's cargo carrier, and is one of eight journeys the company has contracted with
Orb-2 was initially supposed to launch in May, but a Russian-built rocket engine in the Antares rocket failed during a prelaunch test, delaying the mission.
Cygnus will carry some 3,300 pounds (1,500 kilos) of cargo to the station, including food and supplies for the crew, scientific experiments, and a pump for the Japanese module to replace one that failed.
If launch goes as planned, the Cygnus should arrive at the orbiting outpost on
The weather forecast was 90 percent favorable for takeoff.
Coverage of the launch begins on
SpaceX and Orbital now make regular resupply journeys with their unmanned cargo ships.
In order for astronauts to get there, nations must buy seats aboard
Several American companies are competing to be the first to complete a crew vehicle that will restore US access to the station in the next few years.
Orbital's cargo ships burn up on reentry into Earth's atmosphere, unlike SpaceX's Dragon spacecraft, which makes an intact splash landing in the ocean.
Orb-3 is scheduled to launch in November, and three more Cygnus missions are planned for 2015.
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