NASA has begun counting down to the
planned Saturday morning launch of the space shuttle Endeavour and is expecting
pristine weather conditions for blast off.
Endeavour and its crew of seven
astronauts have a 90 percent chance of good weather when they attempt
to launch from NASA's Kennedy Space Center in Florida at 7:17 a.m. EDT
(1117 GMT) on Saturday, mission managers said today. The clocks began counting
down toward the launch earlier today.
"Right now, Endeavour's in great
shape," said NASA test director Steve Payne in a televised status briefing.
"The launch countdown is proceeding nominally and the weather looks like it's
going to cooperate. We're ready to go fly this mission."
The potential for thick clouds over
the launch site pose the only concern since they can trigger lightning when a
shuttle blasts off, mission managers said.
Endeavour is poised to launch a
marathon 16-day construction flight to deliver an experiment porch for the
station's Japanese-built Kibo
laboratory, as well as other gear to International Space Station. Five
challenging spacewalks and a host of tricky robotic arm operations using three
different arms are planned during the mission.
Veteran shuttle astronaut Mark
Polansky will command Endeavour's STS-127 six-man, one-woman crew. The seven
shuttle astronauts will boost the space station's current six-man population to
13 people - the most ever at the orbiting
laboratory - when they arrive.
"This one promises to be a very
exciting mission," Payne said.
NASA has a slim three-day window in
which to launch Endeavour. Weather forecasts for Sunday and Monday are still
favorable but dip slightly, giving the shuttle an 80 percent chance of good
launch conditions, mission managers said.
If the shuttle does not lift off by
June 15, NASA plans to stand down to allow a pair of unmanned lunar probes to
launch toward
the moon from the nearby Cape Canaveral Air Force Station, mission managers
have said. If Endeavour cannot launch this month, NASA's next chance to try
again arises on July 11, when sunlight and heating conditions at the space
station are more favorable.
Endeavour's
STS-127 mission to the space station is NASA's third of up to five shuttle
flights planned for this year.
SPACE.com will provide Moskowitz in
Cape Canaveral, Fla., and Senior Editor Tariq Malik in New York. Click here for mission updates and
a link to NASA TV.
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