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 <[email protected]>
To: karmaka <[email protected]>; [email protected]
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" <[email protected]>
To: <[email protected]>
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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