24May2019

Dashcam Videos Capture “Fireball” Flying Across Australian Skies

A meteor that soared across the Australian sky on Tuesday night was the size of a “small car” when it hit the Earth’s atmosphere, according to an expert from NASA.

Footage of the “fireball” crashing towards the ground flooded social media on Wednesday with sightings of the phenomenon coming in from across both South Australia and Victoria.

It followed another meteor sighting that lit up the sky and shook windows near Alice Springs in the Northern Territory earlier this week. Astronomer David Finlay, who administrates the Australia Meteor Report Facebook page, said data estimates had shown the meteor landed in the ocean, about 400 kilometres south of Adelaide.

He estimated it would have weighed between 20 to 40 tonnes and would have been about the size of a four-wheel drive. He said it was also travelling at about 40,000 kilometres per hour and had an explosive yield of about 1.6 kilotons. “When you think of the Hiroshima nuclear bomb, that was 15 kilotons, so the South Australian fireball was 10 per cent the explosive yield of Hiroshima,” he told the ABC.

“The meteor on Tuesday night was observed travelling through the atmosphere quite close to the SA/Victoria border by our infrasound array near Hobart, as well as at a second infrasound array in New Caledonia,” a Geoscience Australia spokesperson said. “The meteor location is about 400km south of Adelaide [offshore].”

Mr Finlay said while the meteor would have broken up into fragments, he believed it would have been dangerous if its fragments had landed in a populated area. “We’re estimating that around 3 to 4 tonnes would have survived atmospheric entry,” he said.

“If this was over Adelaide, you would be looking at fatalities … I’m not trying to be alarmist here, that’s just the reality of it. “If it was over a populated area we would essentially be looking for holes in roofs and cars.”

Meteor recorded by NASA experts

Despite the claims of its estimated size, Dr Steve Chesley from NASA’s jet propulsion laboratory, based in California, said this particular meteor was pretty small by NASA’s standards.

A map of Australia with yellow lines leading to a location off the shore of South Australia

Geoscience Australia provided a map which shows the estimated landing site of the meteor.(Supplied: Geoscience Australia)

He said he believed it would have been the size of a small car and objects of this size would hit the atmosphere about three to six times a year around the world. “When these things hit the atmosphere going so fast, the pressure from these hypersonic entries basically causes them to shatter and fragment,” Dr Chesley told ABC Radio Adelaide.

Read previous post:
Why You Can’t See Extrasolar Planets With Your Telescope

The most powerful telescopes in the world are unable to...

Plan To Build The Fastest Aircraft In The World

A new aerospace company has entered the race to provide...

Supercomputer Will Run World’s Largest Radio Telescope

When complete, the Square Kilometer Array (SKA) will be the largest radio...

Close