Space Shuttle Discovery Cleared for Monday Blastoff

NASA Sets April 5 Launch Date for Shuttle Discovery
The space shuttle Discovery stands ready at Launch Pad 39A at Kennedy Space Center in preparation for its planned April 5, 2010 launch. (Image credit: NASA/Troy Cryder)

CAPE CANAVERAL, Fla. — The space shuttle Discovery has been cleared for a Monday morning blastoff to begin one of NASA's last scheduled flights of its reusable space plane fleet.

Top NASA officials cleared Discovery for launch during a final preflight review here at the shuttle's seaside launch site at the Kennedy Space Center. Liftoff is set for 6:21 a.m. EDT (1021 GMT).

"In essence, the countdown is in great shape and we're not tracking any issues for launch," NASA test director Pete Nickolenko told reporters in a prelaunch briefing.

Mission managers did discuss minor anomalies from NASA's recent shuttle solid rocket booster test in Utah and a few other glitches, but none are expected to pose any concern for Discovery's launch.

Discovery has an 80 percent chance of good launching weather, with the potential for fog posing the only concern.

The shuttle is slated to launch just before sunrise, making it the last scheduled shuttle launch in darkness. The shuttle's ascent into space may be visible, weather permitting, to skywatchers all along the East Coast of the United States [how to spot the shuttle launch].

NASA shuttle weather officer Kathy Winters said the liftoff should be beautiful.

"After the vehicle launches, we should get a nice sunrise right along the plume," Winters said, adding that the effect would light up Discovery in mid-flight.

NASA plans to fly just four final shuttle missions, including Discovery's, to complete the space station's construction before retiring the three-orbiter fleet in the fall. After that, NASA will have to rely on Russian Soyuz spacecraft to ferry astronauts to the space station until commercially built American spaceships become available.

Commanded by veteran spaceflyer Alan Poindexter, Discovery's four-man, three-woman crew is poised to fly a 13-day mission to the International Space Station to deliver a nearly 27,000-pound (12,246 -kg) cargo pod. Three spacewalks are planned to replace an old station gyroscope and deliver a large ammonia coolant tank.

NASA currently plans to try to launch Discovery twice in a row before the agency would stand down for three days to top off the shuttle's propellant tanks and avoid a rocket traffic jam later in the mission, when an unmanned Air Force rocket is slated to launch a secretive space plane prototype near the shuttle's landing day.

If all goes well, Discovery's Monday launch will come on Easter Monday — one day after the arrival of a Russian Soyuz ferrying three new crewmembers to the station. The Soyuz launched Friday and is due to dock at the orbiting laboratory on Easter Sunday.

Mission managers said they have not changed any launch countdown scheduling or any other preparation work due to the Christian holiday. is providing complete coverage of Discovery's STS-131 mission to the International Space Station with Managing Editor Tariq Malik in Cape Canaveral, Fla., and Staff Writer Clara Moskowitz based in New York. Click here for shuttle mission updates and a link to NASA TV.

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Tariq Malik

Tariq is the Editor-in-Chief of and joined the team in 2001, first as an intern and staff writer, and later as an editor. He covers human spaceflight, exploration and space science, as well as skywatching and entertainment. He became's Managing Editor in 2009 and Editor-in-Chief in 2019. Before joining, Tariq was a staff reporter for The Los Angeles Times covering education and city beats in La Habra, Fullerton and Huntington Beach. In October 2022, Tariq received the Harry Kolcum Award for excellence in space reporting from the National Space Club Florida Committee. He is also an Eagle Scout (yes, he has the Space Exploration merit badge) and went to Space Camp four times as a kid and a fifth time as an adult. He has journalism degrees from the University of Southern California and New York University. You can find Tariq at and as the co-host to the This Week In Space podcast with space historian Rod Pyle on the TWiT network. To see his latest project, you can follow Tariq on Twitter @tariqjmalik.