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article imageProgress 47 re-docks at ISS in second attempt (video)

article:329562:4::0
By Anne Sewell     Jul 29, 2012 in Science
The Russian space freighter Progress 47 failed the maneuver last week, but has now successfully re-docked with the International Space Station.
NASA has announced that "The ISS Progress 47 cargo vehicle docks once again to the International Space Station’s Pirs docking compartment Saturday, July 28, 2012, at 9:01 p.m. EDT after a successful test of its new automated rendezvous system."
On Tuesday night last week an attempt to perform this maneuver was halted as a precaution, due to a system warning on approach.
Progress 47 redocks at ISS.
Progress 47 redocks at ISS.
NASA video screen capture
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The Progress 47 spacecraft earlier delivered fresh supplies to the ISS. The craft then undocked, to run a test of the new automatied rendezvous system, and went to a position some 161 kilometers away and began redocking. However, when the craft was a mere 15 kilometers away from the ISS, the system ordered the maneuver be aborted.
Progress 47 redocks at ISS.
Progress 47 redocks at ISS.
NASA video screen capture
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Russian ISS mission control head, Vladimir Solovyev told media on Tuesday that engineers had found the problem was caused by a proximity sensor fault.
As the spacecraft had enough fuel to perform another rendezvous maneuver, a new attempt was made on July 28 and this time succeeded.
Progress 47 redocks at ISS.
Progress 47 redocks at ISS.
NASA video screen capture
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“We’ve been testing Kurs-NA hardware. We had to work on software too,” Solovyev said.
“We failed with the first attempt. Then we calculated everything, did some simulations on the ground. Now we’ve done it,” he added.
Progress 47 redocks at ISS.
Progress 47 redocks at ISS.
NASA video screen capture
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Russian ISS crew members had to adjust their timetable in order to monitor the maneuver from the space station, with their sleeping time broken into two periods.
The space freighter will remain docked for at least another day, and will then remain in orbit until mid-August, to carry out a scientific experiment.
Once complete, the craft will return to Earth over the Pacific Ocean.
article:329562:4::0
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