NASA satellite breaks up in plunge to Earth

CAPE CANAVERAL, Fla. Sat Sep 24, 2011 1:37pm IST

NASA conceptual image shows the Upper Atmosphere Research Satellite (UARS), launched on September 15, 1991, by the space shuttle Discovery. The six-ton NASA science satellite plunged to earth early on Saturday, but where any debris ended up was not immediately clear. REUTERS/NASA/Handout

NASA conceptual image shows the Upper Atmosphere Research Satellite (UARS), launched on September 15, 1991, by the space shuttle Discovery. The six-ton NASA science satellite plunged to earth early on Saturday, but where any debris ended up was not immediately clear.

Credit: Reuters/NASA/Handout

Related Topics

CAPE CANAVERAL, Fla. (Reuters) - A six-tonnes NASA science satellite fell back to Earth, the U.S. space agency said on Saturday, but it was not yet known where the remains landed.

NASA said its decommissioned Upper Atmosphere Research Satellite was "passing over Canada and Africa as well as vast portions of the Pacific, Atlantic and Indian oceans" as it returned to Earth, and that "the precise re-entry time and location are not yet known with certainty."

The 20-year-old satellite, which took an unpredictable course as it tumbled through the upper atmosphere, fell to Earth sometime between 11:23 p.m EDT on Friday and 1:09 a.m. EDT on Saturday (0323 to 0509 GMT on Saturday), NASA said.

There were reports on Twitter of debris falling over Okotoks, a town south of Calgary in western Canada, most likely satellite remains.

Stretching 35 feet (10.6 metres) long and 15 feet (4.5 metres) in diameter, UARS was among the largest spacecraft to plummet uncontrollably through the atmosphere, although it is a slim cousin to NASA's 75-tonnes Skylab station, which crashed to Earth in 1979.

Russia's last space station, the 135-tonnes Mir, crashed into the Pacific Ocean in 2001, but it was a guided descent.

NASA now plans for the controlled re-entry of large spacecraft, but it did not when UARS was designed.

The 13,000-pound (5,897 kg) satellite was dispatched into orbit by a space shuttle crew in 1991 to study ozone and other chemicals in Earth's atmosphere. It completed its mission in 2005 and had been slowly losing altitude ever since, pulled by the planet's gravity.

Most of the spacecraft burned up during the fiery plunge through the atmosphere, but about 26 individual pieces, weighing a total of about 1,100 pounds (500 kg) could have survived the incineration.

The debris field spans about 500 miles (805 km), but exactly where it is located depends on when UARS descended.

With most of the planet covered in water and vast uninhabited deserts and other land directly beneath the satellite's flight path, the chance that someone would be hit by falling debris was 1-in-3,200, NASA said.

"The risk to public safety is very remote," it said.

The satellite flew over most of the planet, traveling between 57 degrees north and 57 degrees south of the equator.

UARS was one of about 20,000 pieces of space debris in orbit around Earth. Something the size of UARS falls back into the atmosphere about once a year.

(Editing by Vicki Allen)

FILED UNDER:
Comments (0)
This discussion is now closed. We welcome comments on our articles for a limited period after their publication.

  • Most Popular
  • Most Shared

Canada Shooting

REUTERS SHOWCASE

Ebola Outbreak

Ebola Outbreak

Mali becomes sixth West African nation hit by Ebola.  Full Article 

Fighting Islamic State

Fighting Islamic State

Ground offensive against Islamic State months away in Iraq - U.S.   Full Article 

Hong Kong Unrest

Hong Kong Unrest

Protesters in Hong Kong to vote on government proposals  Full Article 

Quest For Statehood

Quest For Statehood

Chief Palestinian negotiator issues statehood ultimatum  Full Article 

Fukushima Probe

Fukushima Probe

Japan prosecutors delay ruling on possible Fukushima indictments  Full Article 

Held For Espionage

Held For Espionage

Canadian couple accused of spying in China held in near isolation, son says  Full Article 

Climate Deal

Climate Deal

EU strikes compromise to set new climate target.  Full Article 

Reuters India Mobile

Reuters India Mobile

Get the latest news on the go. Visit Reuters India on your mobile device.  Full Coverage