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!
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Feb 18 2013, 09:25 PM
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Member Group: Members Posts: 198 Joined: 2-March 05 From: Richmond, VA USA Member No.: 181 |
What kind of confidence is reasonable with the infrasound estimates of the airburst? On a similar note, does anyone have a cold-war era air-burst calculator (such as http://calculating.wordpress.com/2012/05/0...computer-no-1/) to see what effects a 500kT explosion at ~85,000ft would have at various ranges?
Part of my reason for asking is that given the approximations from Collins et al (http://impact.ese.ic.ac.uk/ImpactEffects/effects.pdf), a larger blast seems necessary to produce the observed ground effects (assuming I am not making some bonehead mistake(s), which might not be a safe assumption ). Using the most recent published numbers, I get: http://impact.ese.ic.ac.uk/cgi-bin/crater....&tdens=2500 ... while the following seems to reproduce the knows better (using http://ogleearth.com/2013/02/reconstructin...gh-school-math/ and http://www.youtube.com/watch?v=gQ6Pa5Pv_io...player_embedded as references): http://impact.ese.ic.ac.uk/cgi-bin/crater....&tdens=2500 Thoughts? -- Pertinax |
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Feb 18 2013, 10:19 PM
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Member Group: Members Posts: 723 Joined: 13-June 04 Member No.: 82 |
Thoughts? One thing I have found is that "distance from impact" in that program means "horizontal ground distance from directly under the explosion". If you enter 0.1 km instead of 44.3 km, the results are much closer to the expected numbers, especially if you use the revised density of 3957 kg/m^3 to give a mass of 10,000t, and a velocity of 32.5 km/s to produce an energy release of 500 kilotons, with an 89s travel time for the shock wave to reach the ground. |
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