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Friday, September 15, 2006

Fireball streaks across southern skies Sept. 13th

Flashing across the sky at speeds of 40,000kmh, a meteor in "terminal fireball" has sent a sonic shockwave across the South Island.
The sonic boom from the meteor speeding through the Earth's atmosphere at 2.55pm yesterday was heard by people from Hinds, south of Ashburton, to Blenheim.
The boom caused buildings to shake and windows to break, and prompted a flood of calls to emergency services.
Scientists say it is unlikely anything will be found of the meteor, which was probably no bigger than a basketball.
Mount John Observatory resident superintendent Alan Gilmore said evidence pointed to the meteor exploding in a "terminal fireball" as it got closer to land.
"We did hear reports of a woman saying she saw a bright white light, followed by colours, but that would have been it going `poof' into a luminous cloud," he said.
The noise indicated it was travelling faster than sound, possibly over 40,000kmh, slowing when it hit the Earth's thicker air.
Gilmore said it was unusual to see a meteor during the day, with the last reported daytime sighting in the North Island six years ago.
University of Canterbury astronomist Professor John Hearnshaw said it was "moderately rare" for a meteor to burn up in the atmosphere and be found on the ground.
The meteor most likely exploded as it hit denser air in the upper troposphere – the lowest layer of the Earth's atmosphere – or in the stratosphere above that at an altitude of between 12km and 50km above sea level, he said.
People from across the South Island were stunned by the meteor's flaming progress and sonic boom.
Full Story & Eyewitness accounts:
http://www.stuff.co.nz/stuff/0,2106,3795163a10,00.html

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