[meteorite-list] A Heads-Up: Another important article on Carancas in MAPS 44-12, 2009

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Wed, 24 Mar 2010 19:14:46 -0400
Message-ID: <e51421551003241614x6a241abcx863c0a440bb6377e_at_mail.gmail.com>

Hi Bernd and List,

Another key finding in the paper is that the altitude of the impact
site had little effect on the formation of the crater. There are
still unanswered questions as to why Carancas did not behave the way
it should have, based on it's composition, velocity and trajectory.
We should be thankful that whatever forces caused the crater are not
at play with every OC fall.

Best regards,

MikeG


On 3/24/10, tett <tett at rogers.com> wrote:
> Bernd,
>
> It is GOOD to have you back on the list!
>
> Mike
>
>
>
> bernd.pauli at paulinet.de wrote:
>> TANCREDI G. et al. (2009) A meteorite crater on Earth formed
>> on September 15, 2007: The Carancas hypervelocity impact
>> (MAPS 44-12, 2009, pp. 1967-1984).
>>
>> Some of the key results the authors present:
>>
>> - initial mass 7-12 metric tons
>> - initial diameter 1.6-2 meters
>> - initial velocity 12-17 km/s
>> - initial kinetic energy 0.12-0.41 kT TNT
>> - trajectory roughly east-west
>> - height above the horizon 45-60?
>> - orbit of known near-Earth asteroids
>> - impact time 16:40:14.4 UT
>> - crater dimensions: 13.5 m (rim to rim)
>> - depth to diameter ratio ca. 0.2 (typical of impact craters)
>> - meteorites collected inside and outside the crater
>> - classification H4-5
>> - peak pressures at impact over several GPa
>> - impact velocity on the ground > ca. 3 km/s but < 6 km/s
>> - hypervelocity impact event (impact speed larger than the
>> speed of sound in the target material)
>> - significant ablation but no catastrophic disruption during
>> atmospheric passage
>> - mass on impact 0.3-3 tons / diameter 0.6-1.1 m
>>
>> Best wishes,
>>
>> Bernd
>>
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Mike Gilmer - Galactic Stone & Ironworks Meteorites
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Received on Wed 24 Mar 2010 07:14:46 PM PDT