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Delta IV rocket on launch pad, ready for 8:40 p.m. liftoff

Thu, Feb 20, 2014 at 7:30PM

5:13 p.m. update

Fueling of a Delta IV rocket is proceeding smoothly in preparation for a planned 8:40 p.m. EST liftoff from Cape Canaveral Air Force Station with the Air Force's latest Global Positioning System satellite.

Supercold liquid hydrogen and liquid oxygen feed both first-stage RS-68 engine and second-stage RL 10B-2 engine powering the 206-foot rocket.

The forecast has called for an 80 percent chance of favorable weather during tonight's 19-minute window at Launch Complex 37.

On top of the rocket is the Boeing-built GPS IIF-5 spacecraft -- the fifth of 12 in a new generation that is replacing aging members of the more than 30-satellite constellation and upgrading its capabilities.

It's the first of three GPS satellites to be launched within five months, with the next planned in May and July.

Previous report

A Delta IV rocket and Global Positioning System satellite stand ready for launch tonight after a 33-story mobile service tower rolled back from the rocket this morning at Cape Canaveral Air Force Station.

Liftoff is scheduled for 8:40 p.m. from Launch Complex 37, the opening of a 19-minute window. There's an 80 percent chance of favorable weather.

Launch teams will take their stations early this afternoon in preparation for the loading of super-cold liquid hydrogen and liquid oxygen into first- and second-stage tanks starting about six hours before launch.

Atop the 206-foot United Launch Alliance rocket is the fifth in a series of 12 new satellites called GPS IIF, built by The Boeing Co. 

The GPS IIF-5 satellite will replace a 16-year-old member of the constellation that has 31 active members flying medium Earth orbits more than 11,000 miles high.

Delta IV rocket on launch pad, ready for 8:40 p.m. liftoff

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