‘Bus-size’ satellite headed towards Earth | HT Tech

‘Bus-size’ satellite headed towards Earth

A large, uncontrolled US spy satellite containing hazardous materials has lost power and could hit the Earth in late February or March.

By:AP
| Updated on: Jan 27 2008, 22:40 IST

"Appropriate government agencies are monitoring the situation," said Gordon Johndroe, a spokesman for the National Security Council, when asked about the situation after it was disclosed by other officials.

"Numerous satellites over the years have come out of orbit and fallen harmlessly. We are looking at potential options to mitigate any possible damage this satellite may cause."

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He would not comment on whether it is possible for the satellite to be perhaps shot down by a missile. He said it would be inappropriate to discuss any specifics at this time.

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A senior government official said that lawmakers and other nations are being kept apprised of the situation.

Such an uncontrolled re-entry could risk exposure of US secrets, said John Pike, a defense and intelligence expert.

Spy satellites typically are disposed of through a controlled re-entry into the ocean so that no one else can access the spacecraft, he said.

Pike also said it is not likely the threat from the satellite could be eliminated by shooting it down with a missile, because that would create debris that would then re-enter the atmosphere and burn up or hit the ground.

Pike, director of the defence research group GlobalSecurity.org, estimated that the spacecraft weighs about 9,072 kg and is the size of a small bus.

He said the satellite would create 10 times less debris than the Columbia space shuttle crash in 2003.

As for possible hazardous material in the spacecraft, Pike said it might contain beryllium, a light metal with a high melting point that is used in the defense and aerospace industries.

Jeffrey Richelson, a senior fellow with the National Security Archive, said the spacecraft likely is a photo reconnaisance satellite.

Such eyes in the sky are used to gather visual information from space about adversarial governments and terror groups, including construction at suspected nuclear sites or militant training camps.

The satellites also can be used to survey damage from hurricanes, fires and other natural disasters. The largest uncontrolled re-entry by a Nasa spacecraft was Skylab, the 78-tonne abandoned space station that fell from orbit in 1979.

Its debris dropped harmlessly into the Indian Ocean and across a remote section of western Australia.

In 2000, Nasa engineers successfully directed a safe de-orbit of the 17-tonne Compton Gamma Ray Observatory, using rockets aboard the satellite to bring it down in a remote part of the Pacific Ocean.

In 2002, officials believe debris from a 3,175 kg science satellite smacked into the Earth's atmosphere and rained down over the Persian Gulf, a few thousand miles from where they first predicted it would plummet.

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First Published Date: 27 Jan, 22:32 IST
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