[meteorite-list] Russian meteor composition

From: Jim Wooddell <jimwooddell_at_meteoritecentral.com>
Date: Sat, 16 Feb 2013 17:09:56 -0700
Message-ID: <CAH_zgwF+FDb9_+UyzNKo1BAHW7DCqsMWvhpChjjTiem+a3hbdg_at_mail.gmail.com>

Hi Nick!

I thought the same thing. Why so white? Ice melt! I went back and
looked as some witness falls and this was different. Someone stated
it was iron and that went viral in the media! And the hole in the
ice! How much rounder could it be!!!
And then, what's up with all the cameras! Wow! We sure got to see
some nice video!

Kind Regards,

Jim Wooddell




On Sat, Feb 16, 2013 at 4:25 PM, Nicholas Gessler, Ph.D.
<nick.gessler at duke.edu> wrote:
> Hi Rob et al,
>
> I've spent several hours searching for different video footage of the
> fireball, the "smoke" trail, the hole in the ice, etc.
>
> First, can anyone point me to any scientific papers which attempt
> to correlate:
> a) the color of the "smoky" tail, and/or
> b) the color of the "fireball"
> with the type of meteorite?
> If so, I'd appreciate the reference(s).
>
> It always seemed to me that the "smoke" was so white as to resemble
> condensed water vapor than any "burnt material." At a couple of
> intervals, some pink or orange tint appeared, but the trail was almost
> purely white. That suggests to me that the meteoroid was largely
> ice, but I am no expert.
>
> There are several videos zoomed in of the fireball itself (unless they
> are fakes). The color was orange-red, but perhaps if someone could
> access the camera(s) taking the pictures one might get a clearer assessment
> of the emitted spectrum.
>
> One thing that was notable from the fireball and the "smoke" cloud
> photos was that the object appeared to be quite flat and stable, the
> flames apparent at the two sides, with no flames in between. The
> "smoke" cloud seems to confirm this.
>
> I don't think the symmetrically bifurcated incandescence and tail could
> have been produced by an object broken in two. It looks like one
> object "burning" at both ends. Perhaps some experts in flight dynamics
> could tell us under what conditions we could expect that behavior.
> Any pointers to literature on the bifurcated entry would also be
> appreciated.
>
> Cheers,
> Nick
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-- 
Jim Wooddell
jimwooddell at gmail.com
928-247-2675

Received on Sat 16 Feb 2013 07:09:56 PM PST