free-thinkers.eu European Space Agency's Goce satellite falls to Earth
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European Space Agency's Goce satellite falls to Earth

Source: http://www.bbc.co.uk/news/science-environment-2489...

Dubbed the "Ferrari of space" because of its sleek looks, Goce is the first Esa mission to make an uncontrolled re-entry in more than 25 years. The gravity mapping probe's plunge was inevitable once it ran out of fuel. The mission was operating in an extremely low orbit - at 224km altitude, the lowest of any scientific satellite - and needed to constantly thrust an electric engine to stay aloft, but last month its fuel reserves were exhausted. Pre-return modelling had indicated that perhaps a fifth to a quarter of Goce's one-tonne mass could have endured the fiery fall through the atmosphere. Its sophisticated gradiometer - the instrument used to make gravity measurements - incorporated composite materials that were expected to ride out the destructive forces that would ordinarily incinerate traditional components.Tracking project The Inter-Agency Space Debris Coordination Committee - the global forum on "space junk" - chose Goce as its special study project for 2013. This meant a large number of tracking and surveillance facilities around the world were activated to monitor the satellite's descent to Earth. A signal from Goce was last acquired at 22:42 GMT on Sunday as it passed 121km (75 miles) above Antarctica. Data from the United States Strategic Command (USSTRATCOM) indicated that re-entry occurred a little over one orbit of the Earth later at 00:16 GMT on Monday. This would have put any debris fall in the South Atlantic just east of Tierra Del Fuego. Statistics show that there is typically at least one piece of space "junk" re-entering the Earth's atmosphere every day; with, on average, one intact defunct spacecraft or old rocket body coming back every week. Esa's last mission to make an uncontrolled re-entry was the magnetosphere explorer Isee-2, which came back in 1987. The agency does, however, regularly manage controlled re-entries. Its space station freighter, the Automated Transfer Vehicle, can weigh some 13 tonnes when it comes back to Earth. It has fuel and thrusters to direct its destructive dive towards the vast and uninhabited waters of the Southern Ocean, east of New Zealand. Goce (Gravity Field and Steady-State Ocean Circulation Explorer) was launched in 2009 as part of a series of innovative environmental research satellites. Its super-sensitive gradiometer was used to detect the tiny variations in the pull of gravity across the surface of the Earth. Its maps have very broad applications. The data is a key reference in civil engineering for relating heights measured at widely separated locations, and for the computer models that need to understand how the oceans move to forecast future changes in climate.
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