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German X-ray space observatory will tumble to Earth in early November

Posted by Calypso on September 29, 2011 at 8:27pm
A defunct NASA satellite that fell to Earth last week sparked some worldwide buzz, but it's not the only spacecraft falling out of space.The decommissioned German X-ray space observatory, called the Roentgen Satellite or ROSAT, will tumble to Earth sometime in early November, but it's still too early to pinpoint exactly when and where debris from the satellite will land, according to officials at the German Aerospace Center.The 2.4-ton spacecraft's orbit extends from the latitudes of 53 degrees north and south, which means the satellite could fall anywhere over a huge swath of the planet — stretching from Canada to South America, German Aerospace officials said.The latest estimates suggest that up to 30 large pieces of the satellite could survive the intense and scorching journey through Earth's atmosphere. In all, about 1.6 tons of the satellite components could reach the surface of the Earth, according to German Aerospace officials.The re-entry will be similar to NASA's 6-ton Upper Atmosphere Research Satellite (UARS), which plunged into the southern Pacific Ocean on Saturday .In 1998, ROSAT's star tracker failed, which caused its onboard camera to be pointed directly at the sun. The event permanently damaged the spacecraft and ROSAT was officially decommissioned in February 1999.Scientists are actively tracking the dead satellite, but many of the details will remain uncertain until roughly two hours before it hits Earth."It is not possible to accurately predict ROSAT's re-entry," Heiner Klinkrad, head of the Space Debris Office at the European Space Agency, said in a webcast posted on the German Aerospace Center's website. "The uncertainty will decrease as the moment of re-entry approaches. It will not be possible to make any kind of reliable forecast about where the satellite will actually come down until about one or two hours before the fact."It will, however, be possible to rule out certain geographical regions from the potential drop zone about a day in advance, Klinkrad said. The largest piece of debris is expected to be the telescope's heat resistant mirror."Generally speaking, whenever a satellite re-enters the atmosphere, about 20 to 40 percent of its mass actually reaches the Earth’s surface," Klinkrad said.Fragments from ROSAT could fall back to Earth over a 50-mile (80-kilometer) wide path, but despite the uncontrolled nature of ROSAT's re-entry, the odds of personal injury or property damage are extremely remote, German Aerospace officials said.http://www.space.com/13111-falling-satellite-rosat-november-crash.html
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  • Calypso October 6, 2011 at 1:47am

    yes, i know... here in russia we have lost 2 satellites last month - they were launched but didn't get their orbit, i am sure it is the evidence  the magnet field is moving...

    i am glad to see you in a new image)))

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