[meteorite-list] Chelyabinsk strewnfield map and trajectory projection - updated final version

[Doug Ross]

Amazing work, Svend! A great example of cooperative work between broadly diverse members of the meteorite community, all for the advancement of science. Bravo!

Doug Ross


> Dear all,
> 
> An updated and final version of the Chelyabinsk strewnfield map and trajectory
> ground projection is now available at:
> 
> http://www.meteorite-recon.com/img_inventar/Chelyabinsk_strewnfield_map_7500.jpg
> 
> For background information see:
> 
> http://www.meteorite-recon.com/en/Meteorite_Chelyabinsk_6.html
> 
> In March our calculations gave a window of 200 ? 800 kg for the Lake Chebarkul
> fragment. Our scenario and the resulting map used a conservative value of 300 kg
> for this mass. Now, after its successful recovery, the determination of its
> approximate mass (~ 600 kg) enabled us to narrow a few parameters of the
> trajectory and dark flight. The resulting minor changes in the final map are
> listed below:
> 
> - The transverse displacement of the calculated wind shift discounted
> impact point for the lake mass is reduced from 1.100 m to 950 m.
> - As a result, the trajectory is slightly displaced to the south, albeit
> with the map scale used, the change is of no consequence for the depiction
> - Impact velocity for the lake mass is ~ 550 km/h instead of ~ 500 km/h
> - The altitude at which the transition into dark flight occurred is ~ 14
> km instead of 14.7 km
> 
> In addition to these changes, within the last two months a total of 34 masses
> with documented find locations were submitted and successively added to the map.
> These recently discovered masses range from 0.5 g to 1,440 g. The final version
> of the strewnfield map now shows 285 find locations of Chelyabinsk meteorites,
> of which 228 were submitted with their respective weights.
> 
> Karl and I would like to thank all contributors.
> 
> Cheers
> 
> Svend
> 
> www.meteorite-recon.com