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STS-125: The mission

A detailed step-by-step preview of space shuttle Atlantis' STS-125 mission to extend the life and vision of the Hubble Space Telescope.

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STS-125: The EVAs

The lead spacewalk officer provides indepth explanations of the five EVAs to service Hubble during Atlantis' flight.

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STS-125: The crew

The seven shuttle Atlantis astronauts hold a press conference one month before their planned launch to Hubble.

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STS-125: NASA leaders

The leaders of NASA's Space Operations and Science directorates give their insights into the upcoming shuttle mission to the Hubble Space Telescope.

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STS-125: Shuttle boss

The head of NASA's space shuttle program discusses the risks and plans for Atlantis' trek to Hubble.

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The Hubble program

An overview of the Hubble Space Telescope program and the planning that has gone into the final servicing mission.

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Hubble's future science

The new instruments to be installed into Hubble and the future science objectives for the observatory are previewed.

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Meet the Hubble crew

Meet the crew launching on Atlantis' STS-125 mission to service the Hubble Space Telescope and learn how each became an astronaut in this special biography movie.

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NASA looking at Florida and California for today's landing
BY WILLIAM HARWOOD
STORY WRITTEN FOR CBS NEWS "SPACE PLACE" & USED WITH PERMISSION
Posted: May 23, 2009

Commander Scott Altman and his crewmates, facing more stormy weather at the Kennedy Space Center, readied the shuttle Atlantis for a day-late re-entry Saturday while flight controllers assessed the forecast and options for landing in Florida or California.


Credit: NASA
 
The Atlantis astronauts have three landing opportunities in Florida and two in California on successive orbits, beginning with an 8:01:11 a.m. deorbit to the Kennedy Space Center for a touchdown at 9:15:15 a.m. One orbit later, the crew has a shot at an Edwards Air Force Base, Calif., landing at 10:44:56 a.m. and another Kennedy opportunity at 10:54:10 a.m.

"Unfortunately the weather pattern is very similar to yesterday," astronaut Gregory H. Johnson radioed from mission control just after 4 a.m. "But we're continuing to look at the weather. We'd call it marginal at this point. Our plan is to progress a little further into the deorbit prep timeline. We're thinking we're going to probably press down through (payload bay) door closure (around 5:20 a.m.). However, we're going to hold off suiting up for a little while until we can get a little more comfortable where we're headed."

"OK, copy that. Our tag-up points will be a little further along in the timeline and you plan on probably going through door closure," Altman replied. "But we appreciate the suit-up call."

The Spaceflight Meteorology Group at the Johnson Space Center in Houston is predicting a low, broken cloud deck at 4,000 feet and thundershowers within 30 nautical miles of the Kennedy runway. Flight rule violations include low ceilings, lightning, rain and thunderstorms. While the clouds are expected to lift a bit as the day wears on, thundershowers are expected in the vicinity during all three Kennedy opportunities.

The forecast for Edwards Air Force Base in California's Mojave Desert calls for generally clear skies and acceptable winds.

Atlantis has enough on-board supplies to remain in orbit through Monday. Entry Flight Director Norm Knight said Thursday he would consider keeping the astronauts in orbit until Sunday if the Florida forecast showed a clear, positive trend.

But the SMG is predicting more low clouds and thundershowers at Kennedy Sunday, raising the prospect of a diversion to Edwards later this morning. NASA managers try to avoid California landings if possible because it takes a week to 10 days to get a shuttle back to Florida and costs about $1.8 million. The primary issue, however, is the lost time processing the ship for its next flight. Atlantis' is scheduled to fly again in November.

Seventy of NASA's 123 previous shuttle landings were at Kennedy while 52 were at Edwards. One shuttle mission ended at Northrup Strip, N.M., in 1982.

Here are timelines for the crew's first three landing opportunities today (in EDT; best viewed with fixed-width font):


EDT...........EVENT

Rev. 180 to KSC

TIG: 08:01:11 AM (dV: 174 mph; dT: 02:34)
Crossrange: 4.6 sm
Range to KSC at entry interface: 4,920 sm
Landing: 09:15:15 AM (KSC 15)

04:01 AM......Begin deorbit timeline
04:16 AM......Radiator stow
04:26 AM......Mission specialists seat installation
04:32 AM......Computers set for deorbit prep
04:36 AM......Hydraulic system configuration
05:01 AM......Flash evaporator checkout
05:07 AM......Final payload deactivation
05:21 AM......Payload bay doors closed
05:31 AM......Mission control 'go' for OPS-3
05:41 AM......OPS-3 transition
06:06 AM......Entry switchlist verification
06:16 AM......Deorbit PAD update
06:21 AM......Crew entry review
06:36 AM......CDR/PLT don entry suits
06:53 AM......IMU alignment
07:01 AM......CDR/PLT strap in; MS suit don
07:18 AM......Shuttle steering check
07:21 AM......Hydraulic system prestart
07:28 AM......Toilet deactivation
07:41 AM......Mission control center 'go' for deorbit burn
07:47 AM......Crew seat ingress
07:56 AM......Single APU start

08:01:11 AM...Deorbit ignition
08:03:45 AM...Deorbit burn complete

08:43:55 AM...Entry interface (76 miles)
08:48:24 AM...1st roll command to right
08:55:15 AM...1st right-to-let roll reversal
09:02:15 AM...C-band radar acquisition
09:09:49 AM...Velocity less than mach 2.5 (82,300 feet)
09:10:58 AM...Velocity less than mach 1 (47,500 feet)
09:11:19 AM...Shuttle on the HAC (42,300 feet; 298-degree left turn)
09:15:15 AM...Landing on runway 15

---------------------------------------

Rev. 181 Deorbit to EDW

TIG: 09:29:11 AM (dV: 188 mph; dT: 2:46)
Crossrange: 452 sm
Range to EDW at entry interface: 4,856 sm
Landing: 10:44:56 AM (EDW 22)

09:09 AM......MCC 'go' for deorbit burn
09:15 AM......MS seat ingress
09:24 AM......Single APU start

09:29:11 AM...Deorbit ignition
09:31:57 AM...Deorbit burn complete

10:14:06 AM...Entry interface
10:18:35 AM...1st roll command to left
10:29:38 AM...1st left-to-right roll reversal
10:38:43 AM...Velocity less than mach 2.5
10:40:54 AM...Velocity less than mach 1
10:41:53 AM...Shuttle on the HAC (197-degree turn)
10:44:56 AM...Landing

---------------------------------------

Rev. 181 Deorbit to KSC

TIG: 09:44:56 AM (dV: 165 mph; dT: 2:26)
Crossrange: 221 sm
Range to KSC at entry interface: 4,941 sm
Landing: 10:54:10 AM (KSC 15)

09:24 AM......MCC 'go' for deorbit burn
09:30 AM......MS seat ingress
09:39 AM......Single APU start

09:44:56 AM...Deorbit ignition
09:47:22 AM...Deorbit burn complete

10:22:48 AM...Entry interface
10:27:17 AM...1st roll command to left
10:36:19 AM...1st left-to-right roll reversal
10:47:46 AM...Velocity less than mach 2.5
10:49:54 AM...Velocity less than mach 1
10:50:08 AM...Shuttle on the HAC (310-degree turn
10:54:10 AM...Landing

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