14.09.2017

Researchers from Calgary are scouring the Kootenay region of B.C. for videos of meteorite falling to Earth

The bright flash of the fireball, in the top left corner, lights up the night sky. Now the hunt is on for the meteorite in the Kootenays. (Ian McMullan)

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In the search for remnants of a meteorite, a University of Calgary professor is seeking more video of the fireball that was visible across parts of Western Canada when it entered the Earth's atmosphere over the Labour Day long weekend.

The asteroid fragment is estimated to have weighed between one and five tonnes before it broke up, but surviving rocks have not yet been found.

Witnesses in B.C., Alberta, Saskatchewan, Montana and Washington reported seeing the fireball streak across the sky. It's thought to have landed south of Kaslo, B.C.

U of C professor Alan Hildebrand is now looking to gather more video of the meteorite.

Hildebrand is hoping more videos and pictures of the meteorite entering the atmosphere like this one will help him located the meteorite's final resting place. (@RaphaelPern/Twitter)

Researchers from the university have travelled to the Kootenay region of B.C. to interview eyewitnesses. They also hope to locate any video taken by security cameras in an effort to better pinpoint where these space rocks may have landed.

"Social media and the web are making it easier to gather information, but you still have to be in the field to collect and calibrate observations," said Hildebrand.

'This is a great opportunity'

A dedicated fireball all-sky camera run by Rick Nowell at the College of the Rockies in Cranbrook captured a detailed record of the meteorite from start to finish, which will be used to calculate a pre-fall orbit. 

A map of the approximate area where a meteor is thought to have fallen to earth the night of Sept. 4 in the Kootenays, between Slocan Lake and the Arrow Lakes. (Google Maps)

"This is a great opportunity to recover meteorites that have fallen from a known orbit — which has been done only about two dozen times before and is a big science bonus," said Nowell.

Using additional clues from about a dozen other videos and eyewitness accounts, the researchers have pieced together an approximate trajectory.

100 km in under 10 seconds

The rock hit the atmosphere northeast of Priest Lake, Idaho, headed slightly west of due north. Racing across the border, it passed west of Creston, B.C., heading up the Kootenay Lake Valley to cross the Crawford Bay peninsula.

• As fireball lights up Calgary sky, Calgarians light up social media

"The fireball ended southeast of Kaslo, B.C., after travelling across more than 100 kilometres in approximately eight seconds and penetrating deep into the atmosphere, shaking the Kootenay Valley with thunder-like booms," said Hildebrand. "The largest rocks may have fallen into Kootenay Lake.

"We now have a preliminary estimate of where meteorites fell on the east side of Kootenay Lake, stretching from the community of Riondel to Garland Bay," he said.

University of Calgary scientist Alan Hildebrand, right, is searching for pieces of the meteor that streaked across the sky over the Labour Day long weekend. He's shown here with Saskatchewan farmers Alex and Jan Mitchell holding a 13-kilogram meteorite discovered in Buzzard Coulee, Sask., in 2008. (Geoff Howe/Canadian Press)

"Anyone interested in searching for meteorites should know that the area is mostly forested with moderate to steep slopes. Also be mindful the fire risk in the area remains high."

Researchers encourage anyone running security or wildlife cameras in the Kootenay Lake area to check their cameras (Sept. 4, fireball start time of approximately 11:11 p.m. MT, to see if they captured the light and shadows cast by the fireball).

Anyone with a video is asked to contact Alan Hildebrand at ahildebr@ucalgary.ca. With enough video information, a precise trajectory can be calculated and a better prediction made of where the meteorite fell.​

Quelle: CBCnews