[meteorite-list] 25143 Itokawa and meteorites

From: MexicoDoug <mexicodoug_at_meteoritecentral.com>
Date: Fri, 26 Aug 2011 11:20:58 -0400
Message-ID: <8CE321AE40654D4-1FE8-4277_at_webmail-m046.sysops.aol.com>

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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Received on Fri 26 Aug 2011 11:20:58 AM PDT