With no technical problems and windy but acceptable weather expected, the Discovery astronauts are preparing the veteran spaceplane for its 39th and final re-entry Wednesday to close out an extended space station assembly mission.

Credit: NASA

Commander Steven Lindsey, and his five crewmates -- pilot Eric Boe, entry flight engineer Nicole Stott, Michael Barratt and spacewalkers Stephen Bowen and Alvin Drew -- have two landing opportunities on successive orbits, the first at 11:57 a.m. EST (GMT-5) and the second at 1:34 p.m.

The Spaceflight Meteorology Group at the Johnson Space Center is predicting scattered clouds at 3,000 and 20,000 feet and winds out of 130 degrees at 15 knots with gusts to 23 knots. That translates into a 21-knot headwind on runway 15, 4 knots below NASA's safety limit.

"Winds will be the only thing that are significant in the forecast right now, 130 at 15, peaking at 23," astronaut Charles "Scorch" Hobaugh radioed the crew from mission control. "That gives you a 10-knot cross and a 21-knot headwind. So right now, the weather looks great."

"OK, copy all those words, Scorch," Lindsey replied. "Thanks."

The astronauts plan to close Discovery's cargo bay doors around 8:12 a.m. If the forecast holds up, Lindsey and Boe will shoot for the first landing opportunity, firing the shuttle's orbital maneuvering system braking rockets at 10:52 a.m. for two minutes an 36 seconds to slow the ship by about 194 mph and drop out of orbit for the long glide home.

Credit: NASA

After a half-hour free fall, Discovery will slip into the discernible atmosphere at an altitude of 76 miles above the south Pacific Ocean at 11:25 a.m., following a northeasterly trajectory back to Florida. The orbiter will pass above Central America and just west of Cuba before crossing the Florida coast near Sarasota.

Lindsey will take over manual control as Discovery nears the Kennedy Space Center and drops below the speed of sound at an altitude of about 50,000 feet. Guiding Discovery through a 252-degree left turn, Lindsey will line up for a steep 21-degree descent to runway 15 where ground crews and NASA managers will be waiting to welcome the astronauts back to Earth.

NASA is not staffing its backup landing sites in California and New Mexico. If the weather or technical problems prevent a re-entry Wednesday, the astronauts will remain in orbit an additional 24 hours and land Thursday, on one coast or the other.

Here are timelines for both Wednesday landing opportunities:

Orbit 202 descent to KSC

EST...........EVENT

06:52 AM......Begin deorbit timeline
07:07 AM......Radiator stow
07:17 AM......Astronaut seat installation
07:23 AM......Computers set for deorbit prep
07:27 AM......Hydraulic system configuration
07:52 AM......Flash evaporator cooling system checks
07:58 AM......Final payload deactivation
08:12 AM......Payload bay doors closed
08:22 AM......Mission control 'go' for OPS-3 entry software
08:32 AM......OPS-3 transition
08:57 AM......Entry switch list verification
09:07 AM......Deorbit maneuver update
09:12 AM......Crew entry review
09:27 AM......Commander/pilot don entry suits
09:44 AM......Inertial measurement unit alignment
09:52 AM......Commander/pilot strap in; others suit up
10:09 AM......Shuttle steering check
10:12 AM......Hydraulic system prestart
10:19 AM......Toilet deactivation

10:32 AM......Mission control center 'go' for deorbit burn
10:38 AM......Mission specialists seat ingress
10:47 AM......Single hydraulic power unit start
       
10:52:09 AM...Deorbit ignition (altitude: 221 miles)
10:54:40 AM...Deorbit burn complete (dT: 02:36; dV: 194 mph

11:25:57 AM...Entry interface (altitude: 76 miles)
11:30:48 AM...1st roll command to right
11:38:04 AM...1st roll right to left
12:44:00 AM...C-band radar acquisition
11:51:11 AM...Velocity less than mach 2.5 (altitude: 83,600 feet)
11:53:23 AM...Velocity less than mach 1 (altitude: 50,900 feet)
11:54:13 AM...252-degree left turn to runway 15 (altitude: 38,800 feet)
11:57:44 AM...Landing


Orbit 203 Deorbit to KSC

12:09 PM......MCC 'go' for deorbit burn
12:15 PM......MS seat ingress
12:24 PM......Single APU start
       
12:29:24 PM...Deorbit ignition (altitude: 223 miles)
12:32:00 PM...Deorbit burn complete (dT: 02:36; dV: 194 mph)

01:01:58 PM...Entry interface (altitude: 76 miles)
01:06:47 PM...1st roll command to right
01:21:10 PM...C-band radar acquisition
01:23:53 PM...1st right to left roll reversal
01:27:34 PM...Velocity less than mach 2.5 (altitude: 84,300 feet)
01:29:43 PM...Velocity less than mach 1 (altitude: 52,700 feet)
01:29:55 PM...328-degree left turn to runway 15 (altitude 50,000 feet)
01:34:10 PM...Landing

U.S. SHOPPERS | WORLDWIDE

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VIDEO: LEFT-HAND BOOSTER CAMERA LOOKING UPWARD PLAY
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VIDEO: FLIGHT DAY 8 HIGHLIGHTS MOVIE PLAY
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VIDEO: FLIGHT DAY 7 HIGHLIGHTS MOVIE PLAY
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VIDEO: SPACEWALKER TAKES RIDE OF A LIFETIME PLAY
VIDEO: EUROPEAN EXPERIMENT BRACKET MOVED TO SHUTTLE PLAY
VIDEO: RESIDUAL AMMONIA VENTED FROM FAILED PUMP PLAY
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VIDEO: FLIGHT DAY 6 HIGHLIGHTS MOVIE PLAY
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VIDEO: PERMANENT MULTIPURPOSE MODULE ATTACHED PLAY
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VIDEO: STATION'S NEW MODULE UNBERTHED FROM SHUTTLE PLAY
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VIDEO: ORBITAL SUNRISE OVER PMM BEFORE LEAVING SHUTTLE PLAY
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VIDEO: ANIMATED EXPLANATION OF NEW MODULE PLAY | HI-DEF
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VIDEO: BOLTS ENGAGED TO HOLD OLD PUMP IN STORAGE BOX PLAY
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VIDEO: FLIGHT DAY 3 HIGHLIGHTS MOVIE PLAY
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VIDEO: SPARE PARTS PLATFORM HOISTED FROM SHUTTLE PLAY
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VIDEO: ASTRONAUTS LEAVE CREW QUARTERS PLAY | HI-DEF
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VIDEO: LOOK BACK AT THE LAUNCH DELAYS PLAY | HI-DEF
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VIDEO: DISCOVERY'S COUNTDOWN IS UNDERWAY PLAY
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VIDEO: DISCOVERY CLEARED FOR LAUNCH ON FEB. 24 PLAY

VIDEO: STEVE BOWEN BEGINS CREW TRAINING PLAY | HI-DEF

VIDEO: SUN RISES OVER SPACEPORT AFTER ROLLOUT PLAY | HI-DEF
VIDEO: SHUTTLE ARRIVES ATOP LAUNCH PAD 39A AGAIN PLAY | HI-DEF
VIDEO: CROWDS CHEER ON DISCOVERY'S ROLLOUT PLAY | HI-DEF
VIDEO: DISCOVERY RE-EMERGES FROM THE VAB PLAY | HI-DEF
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VIDEO: FRESH FOAM APPLIED TO EXTERNAL TANK PLAY | HI-DEF

VIDEO: ROOT CAUSE OF SHUTTLE TANK CRACKS FOUND PLAY

VIDEO: REPAIRS AND STRENGTHENING TO TANK PLAY | HI-DEF
VIDEO: DIGITAL X-RAY INSPECTIONS IN THE VAB PLAY | HI-DEF
VIDEO: WORK UNDERWAY TO REMOVE FOAM AND SENSORS PLAY | HI-DEF
VIDEO: SETTING UP ACCESS PLATFORMS AROUND TANK PLAY | HI-DEF

VIDEO: SHUTTLE ROLLED BACK TO ASSEMBLY BUILDING PLAY | HI-DEF
VIDEO: DISCOVERY DEPARTS LAUNCH PAD 39A PLAY | HI-DEF
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VIDEO: HIGHLIGHTS FROM THE FUELING TEST PLAY | HI-DEF
VIDEO: RECAP OF THE FUELING EXERCISE PLAY
VIDEO: FUELING TEST COUNTDOWN UPDATE PLAY
VIDEO: COMMENTS FROM SHUTTLE LAUNCH DIRECTOR PLAY
VIDEO: GROUND UMBILICAL CARRIER PLATE CHECKED PLAY
VIDEO: INFO ON EXTERNAL TANK INSTRUMENTATION PLAY
VIDEO: DETAILED INFORMATION ON SPECIAL FUELING TEST PLAY

VIDEO: SHUTTLE DISCOVERY'S LAUNCH DELAYED TO FEBRUARY PLAY

VIDEO: FINAL PREPS FOR INSTRUMENTED TEST PLAY | HI-DEF
VIDEO: STRAIN GAUGES ATTACHED TO TANK PLAY | HI-DEF
VIDEO: BACKSCATTER INSPECTIONS OF TANK MIDSECTION PLAY | HI-DEF

VIDEO: INSTALLING DOUBLERS OVER STRINGERS PLAY | HI-DEF
VIDEO: GASEOUS HYDROGEN VENT ARM RETURNED PLAY | HI-DEF
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VIDEO: HYDROGEN FITTING IS REINSTALLED PLAY | HI-DEF
VIDEO: OPENING UP TANK'S ENTRANCE DOOR PLAY | HI-DEF
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VIDEO: DISCOVERY AWAITS REPAIRS TO TANK PROBLEMS PLAY | HI-DEF

VIDEO: INFORMATIVE DESCRIPTION OF TANK CRACK PROBLEM PLAY
VIDEO: DISCOVERY'S LAUNCH DELAYED TO MID-DECEMBER PLAY

VIDEO: GASEOUS HYDROGEN VENT ARM DETACHED FROM SHUTTLE PLAY

VIDEO: STS-133 MISSION PREVIEW MOVIE PLAY | HI-DEF
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VIDEO: SPACE STATION CREW BIOGRAPHIES PLAY | HI-DEF

VIDEO: POST-SCRUB NEWS BRIEFING ON LEAK PLAY
VIDEO: GASEOUS HYDROGEN LEAK SCRUBS LAUNCH PLAY | HI-DEF
VIDEO: BAD WEATHER DELAYS DISCOVERY LAUNCH PLAY
VIDEO: ELECTRICAL ISSUE NO LONGER A CONCERN FOR DISCOVERY PLAY
VIDEO: LAUNCH POSTPONED BY ELECTRICAL CONCERN PLAY
VIDEO: TUESDAY MORNING'S COUNTDOWN STATUS CHECK PLAY
VIDEO: DISCOVERY'S PRE-LAUNCH NEWS CONFERENCE PLAY
VIDEO: COUNTDOWN PREVIEW BRIEFING AND WEATHER FORECAST PLAY
VIDEO: ANOTHER 24-HOUR DELAY ORDERED TO FINISH REPAIRS PLAY
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VIDEO: ASTRONAUTS ARRIVE FOR LAUNCH PLAY | HI-DEF

VIDEO: FLIGHT READINESS REVIEW SETS LAUNCH DATE PLAY

VIDEO: SHUTTLE AND STATION PROGRAM BRIEFING PLAY
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VIDEO: PREVIEW BRIEFING ON MISSION'S SPACEWALKS PLAY
VIDEO: IN-DEPTH BACKGROUND ON ROBONAUT 2 HUMANOID PLAY
VIDEO: THE ASTRONAUTS' PRE-FLIGHT NEWS BRIEFING PLAY

VIDEO: PAYLOAD BAY DOORS CLOSED FOR LAUNCH PLAY | HI-DEF
VIDEO: CREW LEAVES KSC FOR TRIP TO HOUSTON PLAY | HI-DEF
VIDEO: ASTRONAUTS INSPECT THE PAYLOAD BAY PLAY | HI-DEF
VIDEO: SHUTTLE EVACUATION PRACTICE PLAY | HI-DEF
VIDEO: ASTRONAUTS EGRESS SHUTTLE AS SEEN LIVE PLAY
VIDEO: ASTRONAUTS BOARD DISCOVERY PLAY | HI-DEF
VIDEO: SUN RISES ON LAUNCH PAD 39A PLAY | HI-DEF
VIDEO: LAUNCH DAY REHEARSAL BEGINS PLAY | HI-DEF
VIDEO: COMMEMORATIVE WALL SIGNING IN VAB PLAY | HI-DEF
VIDEO: CREW BRIEFED ON EMERGENCY PROCEDURES PLAY | HI-DEF
VIDEO: IN SHUTTLE TRAINING AIRCRAFT'S COCKPIT PLAY | HI-DEF
VIDEO: TEST-DRIVING AN EMERGENCY ARMORED TANK PLAY | HI-DEF

VIDEO: PRE-LAUNCH INTERVIEW WITH STEVE LINDSEY PLAY
VIDEO: PRE-LAUNCH INTERVIEW WITH ERIC BOE PLAY
VIDEO: PRE-LAUNCH INTERVIEW WITH AL DREW PLAY
VIDEO: PRE-LAUNCH INTERVIEW WITH TIM KOPRA PLAY
VIDEO: PRE-LAUNCH INTERVIEW WITH MIKE BARRATT PLAY
VIDEO: PRE-LAUNCH INTERVIEW WITH NICOLE STOTT PLAY

VIDEO: PAYLOADS INSTALLED INTO DISCOVERY PLAY | HI-DEF
VIDEO: MISSION PAYLOADS ARRIVE AT LAUNCH PAD PLAY | HI-DEF
VIDEO: CANISTER HAULING PAYLOADS TURNED UPRIGHT PLAY | HI-DEF
VIDEO: MODULE HOISTED INTO SHIPPING CANISTER PLAY | HI-DEF
VIDEO: WEIGHING NEW SPACE STATION MODULE PLAY | HI-DEF

VIDEO: GANTRY PLACED AROUND DISCOVERY PLAY | HI-DEF
VIDEO: SHUTTLE ATLANTIS REACHES PAD 39A PLAY | HI-DEF
VIDEO: CROWDS WATCH DISCOVERY'S FINAL ROLLOUT PLAY | HI-DEF

VIDEO: SHUTTLE HOISTED FOR ATTACHMENT TO TANK PLAY | HI-DEF
VIDEO: CRANE ROTATES THE ORBITER VERTICALLY PLAY | HI-DEF
VIDEO: DISCOVERY DEPARTS ITS HANGAR PLAY | HI-DEF

VIDEO: TIME-LAPSE SHOWS DISCOVERY ASCENDING IN VAB PLAY
VIDEO: TIME-LAPSE SHOWS THE MOVE TO ASSEMBLY BUILDING PLAY

VIDEO: DISCOVERY'S MAIDEN FLIGHT: FIRST TRIP TO VAB PLAY
VIDEO: DISCOVERY'S MAIDEN FLIGHT: ROLLOUT TO PAD 39A PLAY
VIDEO: DISCOVERY'S MAIDEN FLIGHT: TEST-FIRING ENGINES PLAY
VIDEO: DISCOVERY'S MAIDEN FLIGHT: ASSORTED VIEWS OF FRF PLAY

VIDEO: THE HISTORY OF SHUTTLE DISCOVERY PLAY
VIDEO: THE HISTORY OF SHUTTLE ENDEAVOUR PLAY
VIDEO: THE HISTORY OF SHUTTLE ATLANTIS PLAY

VIDEO: INSPECTION OF THE MISSION PAYLOADS PLAY | HI-DEF
VIDEO: ROBONAUT ARRIVES AT KENNEDY SPACE CENTER PLAY | HI-DEF
VIDEO: SPACE STATION'S SPARE THERMAL RADIATOR PLAY | HI-DEF
VIDEO: BLANKETING LEONARDO WITH INSULATION PLAY | HI-DEF
VIDEO: RACK INSERTED INTO LEONARDO FOR LAUNCH PLAY | HI-DEF
VIDEO: LEONARDO RETURNS FROM ITS PREVIOUS FLIGHT PLAY | HI-DEF
VIDEO: STATION'S SPARE PARTS DEPOT ARRIVES PLAY | HI-DEF

VIDEO: ORBITER'S PAYLOAD BAY CLOSED FOR ROLLOUT PLAY | HI-DEF
VIDEO: ASTRONAUTS VISIT THEIR SPACECRAFT PLAY | HI-DEF
VIDEO: CREW INSPECTS LEONARDO MODULE PLAY | HI-DEF
VIDEO: DISCOVERY RECEIVES ITS MAIN ENGINES PLAY | HI-DEF
VIDEO: FUEL TANK MATED TO SOLID ROCKET BOOSTERS PLAY | HI-DEF
VIDEO: HOISTING FUEL TANK INTO CHECKOUT BAY PLAY | HI-DEF
VIDEO: EXTERNAL FUEL TANK UNLOADED FROM BARGE PLAY | HI-DEF
VIDEO: MISSION'S FUEL TANK ARRIVES AT SPACEPORT PLAY | HI-DEF

VIDEO: POST-FLIGHT DESERVICING: OMS POD PLAY | HI-DEF
VIDEO: POST-FLIGHT DESERVICING: OBSS BOOM PLAY | HI-DEF
VIDEO: POST-FLIGHT DESERVICING: ENGINES PLAY | HI-DEF
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