Very doubtful the object is visible. The front of it will have the greatest pressure gradient, which incurs the largest thermal shock in-turn and is therefore the brightest optically. You would not see a dark mass. It is totally engulfed in plasma.
Sent from my iPad On Feb 23, 2013, at 11:17 AM, Chris Peterson <[email protected]> wrote: > 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 > > ______________________________________________ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
