There can be no dark object in front of a fireball. It is the leading
face of the body that is generating the pressure front and heating the
air, resulting in ablation and the light we see.
Keep in mind the scale, as well. We're seeing a ~15 meter diameter body
(and in every other reported case, even smaller) at a minimum distance
of 30 km (and in most cases farther). That means the entire body
subtends a mere 2 arcmin, right around the resolution of the human eye,
and typically smaller than the resolution of a camera.
I suspect that observations and images of any such thing are the product
of various artifacts, both visual and photographic. Also possible are
atmospheric effects related to the supersonic shockwave or compression
zone. But not a physical body, I think.
Chris
*******************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
On 2/23/2013 9:54 AM, Vincent . wrote:
sorry if double mail
Dear all,
When a very big bolide is observed, some witnesses explain the observation of
"the" meteorite parent, just in front of bolide.
I wanted to check this very unknow phenomen.
I decomposed some video from Chelyabinsk bolide. One of them shows a dark mass
in front of the bolide!!! It seem rotating. The dark mass is visible during
approx 1/2 second. Some details are visible 3/10 second later during 2/10
seconds.
With an exciting surprise, the end of path, 1 second later show the fragmentation of two
medium mass. One of them create a veritable "plume" in the sky. Perhaps the
beginning of a rain meteorite?
If this is really the explosion of a meteroite mass in sky and/or the real
"asteroid" falling in the atmosphere, then that's is the first time that the
phenomen is recorded! I'll be very happy to have it discovered.
Photos are visible ==> http://www.flickr.com/photos/93493758@N04/ Enjoy!!
Kind regards
Vincent
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