INCOMING!: метеорита в Челябинске, Russian Meteor - February 2013 |
INCOMING!: метеорита в Челябинске, Russian Meteor - February 2013 |
Feb 15 2013, 07:01 AM
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Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Looks like a small meteoroid decided to spoil 2012 DA14's big day by exploding over Russia...
http://zyalt.livejournal.com/722930.html?nojs=1 -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Feb 15 2013, 08:57 PM
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
It will be interesting to see what the "yield" of this bolide calculates out to be. I don't know how much of an exact correlation between the the yield of an atomic device and this asteroid will be. A bomb is designed to stay smallish and compact as the fission/fusion reaction is taking place and then the fireball can expand at it's own rate. An asteroid is either a rubble pile of coalesced fragments or a highly fractured rock. On atmospheric entry the surface is very hot and ablative while the interior is still deep-space cold, It holds together until the aerodynamic stresses cause it to rupture into many fragments. At that point the surface:volume ratio goes very high and who knows what the dynamics of that is.
At any rate, this was a nice surprise. In the media I've heard the size of the passing asteroid mistakenly listed as "half the size of a football" (not of a football field) and my first thought was "Ha, how ironic, this meteorite was probably half-football sized", but from what I read here, it was somewhat bigger. We should be able to collect many fragments that made it to ground-- the snow ought to help spotting the impact sites. --Bill -------------------- |
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