A private Dragon space capsule is poised for a weekend launch to the International Space Station with the first big cargo shipment ever aboard an unmanned American spacecraft.

The gumdrop-shaped Dragon spacecraft, built by the commercial spaceflight company SpaceX, will blast off on Sunday (Oct. 7) from a launch pad at Cape Canaveral Air Force Station in Florida. Liftoff is set for 8:35 p.m. EDT (0035 Monday GMT), with a planned arrival at the station set for on Wednesday (Oct. 10).

SpaceX and NASA mission managers met Friday to review the preparations for the Dragon flight atop its Falcon 9 rocket, ultimately giving the mission a final "go" for launch. There is a 60 percent chance of good weather for launch.

"It's going to be a very exciting night on Sunday," SpaceX founder Elon Musk said during a Google+ hangout event with NASA chief Charles Bolden today ahead of the review. "I always get kind of nervous before these flights, thinking, like 'What have we missed?'" [SpaceX's Dragon Poised to Sunday Launch (Photos)]

Musk said he and his SpaceX team have done their best to ensure a successful launch Sunday, and while there is always the chance of something going wrong, "I feel like we've done everything we can to make the mission as successful as possible, and I hope people enjoy watching it."

Private delivery for space station

The Dragon mission, the first official cargo run by a private American-built spacecraft, is a watershed flight for NASA and SpaceX. The Hawthorne, Calif.-based company has a $1.6 billion deal with NASA for at least 12 resupply missions to the space station using its robotic Dragon capsules and their Falcon 9 rocket boosters.

The deal is part of NASA's Commercial Resupply Services (CRS) program. With the retirement of NASA's space shuttle fleet last year, the space agency is depending on the availability of new private space taxis to provide unmanned cargo deliveries to the station, as well as ferry American astronauts to and from low-Earth orbit.

Another U.S. company, the Virginia-based Orbital Sciences Corp., has a $1.9 billion agreement to fly at least eight resupply missions to the station using its own Antares rockets and Cygnus spacecraft, and plans to launch a rocket test flight later this year. But SpaceX is the first of the two firms to actually launch vehicles to the International Space Station.

In May, SpaceX (short for Space Exploration Technologies) launched a different Dragon capsule and Falcon 9 rocket on a test flight to the station. That mission demonstrated SpaceX's ability to launch Dragon to the station, have it rendezvous with the orbiting lab safely, and then be captured for docking using a robotic arm controlled by astronauts inside the outpost. [SpaceX's 1st Dragon Flight to Space Station (Video)]

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Private Dragon Spacecraft 'Go' to Launch Toward Space Station Sunday