from On Space
Antares, NASA's second commercial route to the International Space Station, is on the pad and getting ready for its inaugural launch on April 17.
![](http://www.aviationweek.com/Portals/AWeek/OnSpace/Antares%20Going%20Vertical%202%20April%206%20NASA%20Photo.jpg)
Developed by Orbital Sciences Corp. under the U.S. agency's Commercial Orbital Transportation Services (COTS) program, the kerosene-fueled rocket is designed to deliver cargo to the ISS in an unmanned capsule dubbed Cygnus.
![](http://www.aviationweek.com/Portals/AWeek/OnSpace/Antares%20Going%20Vertical%203%20April%206%20NASA%20Photo.jpg)
The first test flight -- the first of two Orbital needs to finish its COTS work and get its final payments -- will send an instrumented dummy Cygnus into the high-inclination orbit occupied by the space station. A second flight, tentatively set later this year, will fly close enough to the station to be grappled by its robotic arm and berthed to a pressurized module for cargo transfer.
If the flights are successful, NASA will have two ways to deliver supplies to the six-person crew on the ISS. SpaceX, the other COTS contractor, already has delivered cargo there with its Dragon capsule, launched on its Falcon 9 rocket.
The Antares will fly from NASA's Wallops Flight Facility on the Eastern Shore of Virginia, using a new state-owned launch pad. It is powered by two modified engines built in Russia during Soviet times, and includes a main stage manufactured in the Ukraine.
![](http://www.aviationweek.com/Portals/AWeek/OnSpace/Antares%20Going%20Vertical%205%20April%206%20NASA%20Photo.jpg)
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