Orbital Sciences Prepares Antares Rocket For Afternoon Launch
Lee Rannals for redOrbit.com – Your Universe Online
Orbital Sciences Corporation will be launching its Antares rocket from NASA’s Wallops Flight Facility in Virginia this afternoon.
The goal of today’s launch is to boost a simulated payload to a target orbit of 155 miles. This will demonstrate Antares‘ capabilities of delivering payload into orbit. The test launch is the final development operation leading to Orbital’s demonstration of cargo delivery to the International Space Station (ISS).
In a statement by NASA, it was acknowledged that there remained a 45 percent chance of having favorable weather for today’s launch. If weather does not allow for the opportunity of a launch today, then more windows will be available April 18 through 21.
Orbital conducted a wet dress rehearsal for its Antares rocket on Saturday in preparation for today’s flight. During this dress rehearsal, the test was halted because the team detected a technical anomaly in the process. Orbital determined that a secondary pyro valve aboard one of the two first-stage engines used in the propellant chill down process was not functioning. Engineers installed a replacement within 24 hours so it could keep its April 17 launch window open.
Antares is a two-stage rocket designed to help provide NASA with low-cost, reliable access to space. Orbital holds a 10-mission contract with NASA, including eight resupply missions to the space station.
After lift-off, Antares’ first stage will fire for approximately four minutes, helping to place the launch vehicle to an altitude of 70 miles. Once the launch vehicle reaches this altitude, Stage 2 will kick in and continue to boost the simulated payload to its proper orbit. NASA says the simulated payload will be reaching its orbit in less than ten minutes from lift off.
The Antares rocket will be carrying the Cygnus advanced maneuvering spacecraft along with it. This space vessel is what will eventually be holding the payload for future ISS resupply missions. The Cygnus spacecraft consists of a Service Module, power and navigation systems, and a Pressurized Cargo Module (PCM).
SpaceX became the first company to dock with the space station last year. Its reusable Dragon capsule has been working hard since then to provide astronauts aboard the orbiting laboratory with more supplies. Although it has been working almost perfect as a resupply vehicle since its first launch, the spacecraft will eventually be transformed for use as a way to carry astronauts into space instead of cargo.
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2013-04-17 13:32:34
Source: http://www.redorbit.com/news/space/1112824683/antares-rocket-ready-for-launch-afternoon-041713/
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