[meteorite-list] 25143 Itokawa and meteorites

[MexicoDoug]

Isn't this exciting news Al & Martin!

Al from wikipedia:
"S-type asteroids are of a siliceous (stony) composition, hence the 
name. Approximately 17% of asteroids are of this type, making it the 
second most common after the C-type."

and from the Nature link:
"S-types are commonly found on the inner fringes of the belt,"

So it is not fair to call puny Itokawa even one of many "parent body" 
asteroids; only that a reasonable composition match for LL chondrites 
was found in what might be representative of its surface dust.  The 
asteroid is only 2 X 2 X 6 city blocks in size or so ... but 
interesting since its orbit gets closer to our neighborhood.

There is a case for all Vestoids being from Vesta, but such a common 
origin has not (yet?) been identified for S-type asteroids.  With the 
exception of Vesta, no asteroid parent bodies are suspected with any 
certainty to be such grand-parent bodies.  Grandparent, meaning it is 
directly linked ... rather than one of a billion possibilities.  It is 
extremely unlike that "all LL's" are from Itokawa and probably unlikely 
that *any* are from it as well.

al wrote:
"Wonder if all the LL's are from Itokawa or if we have more than one 
parent body source for those?? "

Kindest wishes
Doug




-----Original Message-----
From: al mitt <almitt at kconline.com>
To: karmaka <karmaka at email.de>; meteorite-list at meteoritecentral.com
Sent: Fri, Aug 26, 2011 9:02 am
Subject: Re: [meteorite-list] 25143 Itokawa and meteorites


Greetings, 
 
So Itokawa is the parent body of the LL chondrites. Asteroid Hebe is 
thought (by spectra) to be the parent body of most or all the H 
chondrites. Asteroid Eros the L4 chondrites and Asteroid Bozemcova the 
L6 chondrites. 
 
Wonder if all the LL's are from Itokawa or if we have more than one 
parent body source for those?? 
 
Best! 
 
--AL Mitterling 
 
----- Original Message ----- From: "karmaka" <karmaka at email.de> 
To: <meteorite-list at meteoritecentral.com> 
Sent: Thursday, August 25, 2011 2:40 PM 
Subject: [meteorite-list] 25143 Itokawa and meteorites 
 
> Hello list 
> 
> here some interesting new articles about the analysis of the Itokawa 
> matter: 
> 
> 
http://www.space.com/12733-earth-meteorites-stony-asteroid-mystery.html 
> 
>
> 
> 
http://www.physorg.com/news/2011-08-earth-bound-asteroids-stony.html[http://www.space.com/12733-earth-meteorites-stony-asteroid-mystery.html] 
> 
> Martin  
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