New communications satellite set to launch

NASA plans to launch a new satellite Wednesday to upgrade the network used to send messages back and forth between spacecraft and the ground.

The space agency is set to launch the new Tracking and Data Relay Satellite K (TDRS-K for short) at 8:48 p.m. EST from Cape Canaveral Air Force Station in Florida. The spacecraft will blast off atop a United Launch Alliance Atlas 5 rocket.

You can watch the launch live on Space.com through NASA TV starting at 6:15 p.m. ET.

Cold front
Weather at the launch site is looking promising, but NASA officials aren't taking any chances, and won't launch the rocket unless skies are clear.

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"Now we're looking at a 40-percent chance that a weather rule will be violated," Joel Tumbiolo, a NASA launch weather officer, said on Monday.

The rocket that will carry TDRS-K to orbit has already been rolled out onto the launch pad, but a cold front is approaching Cape Canaveral that could delay the launch. Electrically active clouds heralding the arrival of the cold front might create dangerous conditions.

TDRS-K has an estimated cost of between $350 million and $400 million, not counting the cost of the rocket to launch it. The spacecraft is the first of three new satellites due to lift off between now and 2015 to bolster the TDRS communications satellite network, which relays data and messages between spacecraft in orbit and ground stations. [ NASA's New Comsat: TDRS-K Spacecraft in Photos ]

Thanks to the positioning of ground elements and the TDRS network of satellites around the world, NASA scientists have constant communication with orbiting spacecraft. The network is responsible for space-to-ground communication with the International Space Station as well as the Hubble Space Telescope.

Orbital network
The TDRS-K satellite is expected to last at least 15 years in orbit. It is the 11th TDRS spacecraft to launch since the network was started in 1983. Today, five satellites are in active service, but one might be retired once TDRS-K is placed in orbit, said Badri Younes, a scientist in NASA's Space Communications and Navigation office.

The Atlas 5 rocket will boost the new satellite into an orbit 22,300 miles (35,888 kilometers) high, where it will join a network of other relay spacecraft above the planet. Once out of Earth's atmosphere, the rocket's main engine will separate and fall away, leaving a second-stage centaur rocket engine to carry the 26.7-foot-tall (8 meters) satellite into orbit.

The TDRS-K has two insectlike antennas that are folded during launch. Once the satellite detaches from the rocket's second stage, its antennas will pop out into a bowl shape. After 10 days of maneuvering into its proper orbit, TDRS-K's two solar arrays will unfurl and the antennas will lock into place.

After launch, NASA will test the satellite for three months to make sure everything is in working order. Once those tests are complete, the TDRS team will decide if the satellite is ready for service (if not, it will be moved to a backup position).

Follow Miriam Kramer on Twitter @mirikramer or Space.com @Spacedotcom. We're also on Facebook? and??Google+.

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Source: http://www.nbcnews.com/id/50640765/ns/technology_and_science-space/

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