[meteorite-list] NASA finds extra-terrestrial amino-acids in Sudan meteor...

From: Impactika at aol.com <Impactika_at_meteoritecentral.com>
Date: Thu, 30 Dec 2010 18:20:28 EST
Message-ID: <189f8.1a5c089d.3a4e6dbc_at_aol.com>

Hello Bernd, Rob, and all.

If you would like to read a whole lot more about Almahata Sitta (aka 2008
TC3), here is a link to the Abstract I have received from Prof. Bischoff.
Warning it is 29 pages!

_http://www.impactika.com/ASitta-maps-bischoff.pdf_
(http://www.impactika.com/ASitta-maps-bischoff.pdf)
 
I have also been told that MAPS will eventually publish a special issue
entirely dedicated to A. Sitta.
And yes Rob it was a rubble pile. I have also heard it called a "garbage
pile" ;-)
 
Enjoy
 
And Happy New Year to all.
 
>From snowy Denver, our first real snow storm.
 
Anne M. Black
_http://www.impactika.com/_ (http://www.impactika.com/)
_IMPACTIKA at aol.com_ (mailto:IMPACTIKA at aol.com)
President, I.M.C.A. Inc.
_http://www.imca.cc/_ (http://www.imca.cc/)
 


In a message dated 12/30/2010 3:30:40 PM Mountain Standard Time,
bernd.pauli at paulinet.de writes:
Hello All,

Rob asked:

"So the obvious question to ask is why anyone thinks that the interior
of 2008 TC3 was ever heated up to 1100 C? Sure, the *surface* of the
asteroid got very hot when it entered earth's atmosphere, but how is
that different from Murchison or any other meteorite-generating fall?
The interior of 2008 TC3 should never have been above freezing."


Hello Rob and List,

Maybe the National Geographic people confounded the external heat that only
affected the outer layers of that presumed rubble pile when Almahata Sitta
entered earth's atmosphere with the heat that was produced when source
material similar to carbonaceous chondrites was converted into ureilites during a
collisional scenario somewhere in the asteroid belt accompanied by
subsequent recrystallization and annealing at high temperatures (1160?-1200?C*).

Reference:

*CHIKAMI J. et al. (1996) Ureilite formation process with regard
to the LEW 88774 ureilite (Meteoritics 31-4, 1996, A027-A028).


Cheers and all the best
for 2011 to all of us,

Bernd
Received on Thu 30 Dec 2010 06:20:28 PM PST