NASA sets Wednesday launch date for shuttle Endeavour

NASA managers today formally cleared the shuttle Endeavour for a delayed launch Wednesday on a space station assembly mission. Launch of the agency's Lunar Reconnaissance Orbiter was delayed to June 18 or 19 to make room for the shuttle in an effort to maximize launch opportunities for both missions.

Endeavour was grounded Saturday when a gaseous hydrogen vent line umbilical seal leaked potentially dangerous vapor during fueling. Engineers replaced the seal and while the schedule is tight, NASA managers decided today to retarget the shuttle for launch at 5:40:50 a.m. EDT Wednesday.

The shuttle's countdown will be restarted at the T-minus 11-hour mark at 1:15 p.m. Tuesday and forecasters are predicting an 80 percent chance of good weather.

As it now stands, the Endeavour astronauts will have one shot at getting off the ground Wednesday. If the shuttle runs into additional problems, the flight likely will be delayed to July 11 because of temperature constraints related to the International Space Station's orbit.