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Tor wrote: »
The last reports (from the Russian Academy of Sciences) suggest that it disintegrated (with the power of a small nuke, so 'explode' would be an alternative description) 30-50km up in the atmosphere.
Mark_T wrote: »
For the record the Russian meteor is not related to the asteroid near miss, just a coincidence. Parts of it are in a frozen lake and presumably will be recovered and
analyzed in due course. I've also heard 10 tonnes (which isn't anything like 17m diameter), but that might mean a fragment on the ground, not the original size.
skylight wrote: »
This is being blamed on the russian meteorite
pmrobert wrote: »
I've seen this somewhere before......
Tor wrote: »
I was just now reading BBC, and according to the BBC Nasa estimates the pre-entry weight to 10,000 tonnes. And releasing 500 kilotons of energy.
jmg wrote: »
- 6m hole in the ice, is quite small, and the fragment that hit the lake has to be much smaller than 6m, as the ice around it is little disturbed.
The estimated size of the object, prior to entering Earth's atmosphere, has been revised upward from 49 feet (15 meters) to 55 feet (17 meters), and its estimated mass has increased from 7,000 to 10,000 tons. Also, the estimate for energy released during the event has increased by 30 kilotons to nearly 500 kilotons of energy released. These new estimates were generated using new data that had been collected by five additional infrasound stations located around the world – the first recording of the event being in Alaska, over 6,500 kilometers away from Chelyabinsk. The infrasound data indicates that the event, from atmospheric entry to the meteor's airborne disintegration took 32.5 seconds. The calculations using the infrasound data were performed by Peter Brown at the University of Western Ontario, Canada.