This story was updated at 7:00 p.m. EST.
After an hours-long meeting at the Kennedy Space Center in Florida, NASA's top officials unanimously cleared the space shuttle Discovery for its final launch next Thursday (Feb. 24).
NASA shuttle managers made the decision today (Feb. 18) during the mission's Flight Readiness Review, where they discussed the current state of Discovery, the International Space Station, and the astronauts who will fly the orbiter on its 39th and final flight.
Following the meeting, NASA officially set the shuttle's launch date and time for Feb. 24 at 4:50 p.m. EST (2150 GMT). [Gallery: Building Space Shuttle Discovery]
"I can't say enough about the work the teams have done, they did a tremendous job," Bill Gerstenmaier, NASA's associate administrator for space operations, said in a news briefing today.
Discovery is targeted to liftoff from Kennedy Space Center in Cape Canaveral on the same day that the European Space Agency's Automated Transfer Vehicle-2 (ATV-2) cargo ship is scheduled to arrive and dock at the space station.
Initially, NASA officials thought the space traffic jam would force mission planners to delay Discovery's launch by one day – to Feb. 25. But, NASA officials decided early in today's meeting that changing the shuttle's launch date is not necessary.
"The ATV is going to dock about six hours before we launch," said Mike Moses, NASA's shuttle integration manager. "We will have tanked the vehicle by then. If they run into a problem during docking, we still might launch that day, we might not – we'll have to talk about that one in real time."
Last week, space shuttle program managers met and unanimously agreed to proceed toward the orbiter's targeted launch. Officials also discussed the possibility of adding a bonus photo session to the flight, in which the Russian Soyuz capsule will undock from the space station and fly around to snap photographs of Discovery while the ship is docked to the fully completed orbiting lab.
The unique photo opportunity was discussed during today's Flight Readiness Review (FRR), but aNASA officials confirmed today that a final decision on the matter will not be made prior to Discovery's launch.
"It's okay from a flight readiness review standpoint, but it's really up to the team to see what happens," Gerstenmaier said.
Discovery's STS-133 mission is an 11-day flight to deliver a humanoid robot and a new storage room to the International Space Station. The mission has already been delayed months because of fuel tank problems. It will be the final flight of shuttle Discovery before NASA retires its three-orbiter fleet later this year.
NASA is ending its space shuttle program this year after 30 years of spaceflight to make way for new exploration plans that call for sending astronauts to an asteroid by 2025 and to Mars in the 2030s.
Once the shuttle fleet retires, NASA will rely on unmanned spacecraft built by Europe, Russia and Japan to deliver cargo to the space station until American-built commercial spacecraft become available.
You can follow SPACE.com Staff Writer Denise Chow on Twitter @denisechow.