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07/08/11: Updating countdown, ascent events.07/07/11: Ascent events/abort boundaries timeline.STS-135 Flight Data Changes and additions:

SSPTS: ISS-to-STS power transfer system.

SPDM: Special purpose dexterous manipulator.

S1-6: Starboard solar array truss segment.

PRSD: Power reactant storage and distribution system.

OIS: Operational intercommunication system.

LWAPA: Lightweight adapter plate assembly.

EATCS: Ext Active Thermal Control System.

CLPA: Camera light pan and tilt mechanism.

CETA: Crew equipment and translation aid.

CCAFS: Cape Canaveral Air Force Station.

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APFR: Adjustable portable foot restraint.

Those are obviously very, very low odds that anybody's going to be impacted by this debris.' 'Numerically, it comes out to a chance of 1-in-3,200 that one person anywhere in the world might be struck by a piece of debris. 'We looked at those 26 pieces and how big they are and we've looked at the fact they can hit anywhere in the world between 57 north and 57 south and we looked at what the population density of the world is,' he said.

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But computer software used to analyze possible re-entry outcomes predicts 26 pieces of debris will survive to impact the surface in a 500-mile-long down-range footprint. Nick Johnson, chief scientist with NASA's Orbital Debris Program at the Johnson Space Center in Houston, told reporters last week he expects most of the satellite to burn up as it slams into the dense lower atmosphere at more than 17,000 mph. No more fuel is available for maneuvering and the satellite's re-entry will be 'uncontrolled.' The long-lived satellite was decommissioned in 2005 and one side of its orbit was lowered using the last of its fuel to hasten re-entry and minimize the chances of orbital collisions that could produce even more orbital debris. The solar-powered satellite studied a wide variety of atmospheric phenomena, including the depletion of Earth's ozone layer 15 to 30 miles up. The centerpiece of a $750 million mission, the Upper Atmosphere Research satellite was launched from the shuttle Discovery in September 1991. Tracking data is expected to improve as the day wears on, and subsequent updates should be more precise. No one on the ground was injured and no significant property damage was reported. But the prediction was uncertain by several hours and at orbital velocities of 5 miles per second, just 10-minutes of uncertainty translates into 3,000 miles of uncertainty in position.ДЇor comparison, some 42.5 tons of wreckage from the shuttle Columbia hit the ground in a footprint stretching from central Texas to Louisiana when the orbiter broke apart during re-entry in 2003. EDT Friday as the spacecraft flies over the southern Indian Ocean. Strategic Command, which operates a global radar network used to monitor more than 20,000 objects in low-Earth orbit, predicted the satellite would re-enter sometime around 11:34 p.m.

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It is still too early to predict the time and location of re-entry with any certainty, but predictions will become more refined in the next 12 to 18 hours.'ДЄ subsequent update from U.S. 'There is a low probability any debris that survives re-entry will land in the United States, but the possibility cannot be discounted because of this changing rate of descent. В• Track NASA's crashing satellite to avoid getting hit by space junk The satellite's orientation or configuration apparently has changed, and that is now slowing its descent. Solar activity is no longer the major factor in the satellite's rate of descent. 23, 2011, the orbit of UARS was 100 miles by 105 miles (160 km by 170 km),' NASA said in a brief update. Because of uncertainty about the satellite's behavior as it approaches the discernible atmosphere, the timing of the re-entry could change by several hours either way. A chart showing the latest predicted entry point for the Upper Atmosphere Research Satellite, based on data from U.S. But given the bus-size 6.3-ton's satellite's trajectory and the vast areas of ocean and sparsely populated areas UARS passes over, experts say it is unlikely any falling debris will result in injuries or significant property damage.ДЄdditional radar tracking is required to pinpoint when-and where-the satellite will make its final descent.

NASA's decommissioned Upper Atmosphere Research Satellite, out of gas and out of control, is not descending toward re-entry as rapidly as expected, officials say, likely delaying the satellite's kamikaze plunge to Earth by a few hours, to late Friday or early Saturday.Д®xperts expect more than two dozen chunks of debris to survive re-entry and hit the ground in a 500-mile-long footprint somewhere along the satellite's orbital track.

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