A new commercial spacecraft built to haul cargo to the International Space Station for NASA made its debut delivery to the orbiting lab early Sunday, Sept. 29, capping a major test flight for its builder Orbital Sciences Corp., which described the space rendezvous as "epic."

The robotic Cygnus spacecraft was captured by space station astronauts using the outpost's robotic arm at 7 a.m. EDT (1100 GMT) as the two spacecraft sailed over the Indian Ocean. The orbital arrival, which occurred one week later than planned due to a software data glitch, appeared to go flawlessly. 

"Houston, station, Cygnus capture complete," Italian astronaut Luca Parmitano radioed NASA's Mission Control in Houston as he latched onto the spacecraft with the station's robotic arm. [See more photos from Orbital Sciences' 1st Cygnus test flight]

The Cygnus spacecraft launched to the space station on Sept. 18 in a smooth blastoff from NASA's Wallops Flight Facility in Virginia. It launched atop an Antares rocket, also built by the Dulles, Va.-based Orbital Sciences.

"It looks great," NASA astronaut Karen Nyberg as Cygnus hovered below the space station, with the bright blue Earth as a backdrop.

Orbital officials initially aimed for Cygnus to arrive at the space station on Sept. 22, but a data format issue between the spacecraft and orbiting lab forced the company to abort that first rendezvous attempt. Troubleshooting efforts with that glitch and the impending arrival of a new space station crew aboard a Russian Soyuz spacecraft, which launched and docked on Wednesday , Sept. 25, pushed Cygnus' arrival to Sunday.

Despite the delay, the Cygnus spacecraft appeared to perform flawlessly during the arrival and capture at the space station. The rendezvous is a major test flight success for Orbital Sciences, which began work on the Cygnus and Antares space vehicles in 2008 and received $288 million from NASA to jumpstart the project.

Astronaut Cady Coleman in Mission Control radioed congratulatory messages to the space station crew from NASA chief Charles Bolden and Orbital Sciences officials after Cygnus' arrival. Those messages, she said, called today's Cygnus rendezvous a "superb" and "epic" event.

Sunday's test flight marked the last milestone for NASA's Commercial Orbital Transportation Services program, and sets the stage for Orbital's first official cargo delivery mission to the space station. Orbital has a $1.9 billion deal with NASA to provide eight cargo delivery flights using its Cygnus spacecraft and Antares rockets. The first of those deliveries could launch in December, company officials have said.

Orbital's Cygnus spacecraft is a silver pressurized cylinder 17 feet (5 meters) long built for the company by Italy's Thales Alenia Space. It is powered by an Orbital-built service module containing two solar wings for power, as well as rocket thrusters.

The spacecraft is designed to carry up to 4,409 pounds (2,000 kg), though this first test flight is packed with only 1,543 pounds (700 kilograms) of supplies and gear, Orbital officials have said. Cygnus spacecraft are designed to burn up in Earth's atmosphere at the end of their missions.

With the retirement of NASA's space shuttle fleet in 2011, the space agency is depending on companies like Orbital Sciences to keep the International Space Station stocked with supplies. Orbital Sciences is one of two commercial spaceflight companies with billion-dollar contracts for cargo delivery.

The other firm is SpaceX of Hawthorne, Calif., which has a $1.9 billion contract for 12 supply missions using its Dragon space capsules and Falcon 9 rockets. SpaceX has flown two of those delivery missions already, and is expected to test fly an upgraded version of its Falcon 9 rocket later today in a launch from California. Unlike Cygnus, SpaceX's Dragon capsules are equipped with a heat shield and can return science experiments and gear to Earth from the station.

Orbital Sciences named the first Cygnus Spaceship G. David Low after a former NASA astronaut who oversaw Orbital's bids for NASA contracts, but died of cancer in 2008.

On Twitter, Orbital officials thanked the astronauts who captured Cygnus, and had a special note for Low: "... and to our great friend and colleague G. David Low...this one's for you," they wrote.

"We're very happy to have G. David Low onboard with us, and thanks to the whole team," Nyberg said.

The Cygnus spacecraft will stay linked to the space station for about 30 days, after which it will be detached and set free in mid-October to be intentionally destroyed in Earth's atmosphere. The disposable nature of Cygnus is similar to that the unmanned Russian, European and Japanese cargo ships that also service the International Space Station.

SPACE.com is providing complete coverage of Orbital's first Cygnus test flight to the International Space Station.

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