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midtskogen
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Asteroids, meteors, and meteorites

16 Dec 2016 03:08

Let's continue the thread in the old forum.

A new asteroid impact simulation
But it's odd that the video does not mention another, extremely important factor: impact speed, which is much more important than size for the total energy involved, unless the airburst scenario really is higher speed.
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Watsisname
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Asteroids, meteors, and meteorites

16 Dec 2016 14:39

That does seem odd, but the way their simulations work is to follow the transfers of energy during the impact -- both through atmosphere and water, so all that varying impact speed does is scale the total energy by the square of the speed.  (And as you intuited, it also plays into whether it reaches the surface or airbursts).  The factors of speed, size, composition, and entry angle all play together as to what the impact looks like, but their presentation focuses on the differences in water jet and wave formation based on energy and impact vs. airburst.

I thought it was surprising to see how part of the pressure wave, and water vapor with it, quickly propagates backwards, since the asteroid's entry path cleared out a channel of low pressure in the atmosphere. 

It's also terrifying to imagine a water jet that is several kilometers high. =o
 
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midtskogen
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16 Dec 2016 23:45

My intuition tells me that this is complex and that the heat plays a major role her, but whether a doubling of speed can be exchanged for a quadrupling of mass at this scale with little difference in effect, I don't know.  Yes, the water jet is terrifying.

On a much smaller scale, I made a video summarising the findings after the fireball off the coast of Norway last week.
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midtskogen
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28 Feb 2017 12:45

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DoctorOfSpace
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28 Feb 2017 13:15

That is quite awesome 
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Xoran
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01 Mar 2017 06:55

Since we are talking about asteroids, 99942 Apophis is on of the more interesting asteroids, as it was calculated a long time ago that it had a 2.7 % probability to hit Earth, which was later confirmed to be a very small probability ;)

Also, 16 Psyche is quite a interesting asteroid too, as it was probably involved in a massive collision which devastated it, causing it to probably be literally a big blob of mostly iron and nickel.
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midtskogen
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15 Mar 2017 04:21

I got this image last night:
► Show Spoiler

Visible for about 6.5 seconds (video).  Slow moving meteor (12 km/s) reaching an altitude of 34 km.
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