A one-tonne satellite that ran out of fuel has safely re-entered the Earth’s atmosphere, burning up during its descent.
The GOCE satellite (‘Gravity field and steady-state Ocean Circulation Explorer’, pronounced GO-chay) was operated by the European Space Agency (ESA), who reported losing contact with the vehicle at 10.42 GMT on Sunday.
The satellite’s last transmission was made from 75 miles above Antarctica as it was directed to towards the uninhabited Southern Ocean, east of New Zealand. Computer modelling predicted that up to 25 per cent of GOCE’s mass might survive re-entry.
“As expected, the satellite disintegrated in the high atmosphere and no damage to property has been reported,” said the ESA in a press release. “On 21 October, the mission came to a natural end when it ran out of fuel. Over the past three weeks the satellite gradually descended.”
Known as the “Ferrari of space" due to its sleek and compact shape, GOCE was a unique craft that used stabilising fins and an innovative ion drive to orbit the Earth at an altitude of 260km – lower than any previous research satellite.
Ion propulsion systems are incredibly low-powered compared to traditional chemical rockets but they allow for precise and steady control, allowing the satellite to tack along upon the sparse wisps of air.
This allowed it produce the most accurate maps of the planet’s gravity ever seen by scientists, with the resulting ‘geoid’ (a hypothetical map of the oceans affected only by gravity and planetary rotation) offering new insight into currents, sea levels and the Earth’s interior.
“The one-tonne GOCE satellite is only a small fraction of the 100–150 tonnes of man-made space objects that reenter Earth’s atmosphere annually,” said Heiner Klinkrad, Head of ESA’s Space Debris Office.
“In the 56 years of spaceflight, some 15 000 tonnes of man-made space objects have reentered the atmosphere without causing a single human injury to date.”
A video from the ESA illustrating the GOCE satellite and the geoid it has produced.
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