by Staff Writers
Paris (AFP) Nov 09, 2013
Fragments from a science satellite are likely to crash to Earth late Sunday or early Monday after the one-tonne probe breaks up at the end of its mission, the European Space Agency (ESA) said on Friday.
In a statement, the agency said when and where the pieces would land was still unclear.
Experts have previously said the statistical risk to humans is remote.
Several dozen fragments totalling around 200 kilos (440 pounds), or about the weight of car engine, will survive contact with the atmosphere, according to computer models.
The Gravity Ocean Circulation Explorer (GOCE) satellite was placed in orbit in 2009 on a mission to monitor variations in gravity and sea levels.
The sleek, finned craft ran out of fuel on October 21, leaving it without power to maintain its altitude in low orbit, where there are still lingering molecules of air.
"Reentry of GOCE into Earth's atmosphere is predicted to occur during the night between Sunday and Monday," ESA said on Friday.
"Break-up of the spacecraft will occur at an altitude of approximately 80 km (50 miles). At the moment, the exact time and location of where the fragments will land cannot be foreseen."
GOCE was launched in March 2009 at an altitude of 260 kilometres (160 miles) -- later lowered to 224 km -- the lowest ever for a research satellite.
The 350-million-euro ($465-million) mission has lasted twice as long as its initially-scheduled 20 months.
According to ESA spacecraft operations manager Christoph Steiger, most of the 5.3-metre-long (17.2-foot) spacecraft will burn up.
The chances of a human being hit were about 65,000 times lower than getting struck by lightning, he said in October.
In more than half a century of spaceflight, there have been no casualties from man-made space debris, despite about 20-40 tonnes impacting somewhere on Earth each year, Steiger said.
GOCE was designed and built before 2008, when international recommendations were adopted that a scientific satellite must be able to execute a controlled reentry, or burn up completely after its mission.
Space Technology News - Applications and Research
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|