[meteorite-list] Cold Asteroids May Have A Soft Heart (AllendeMeteorite)

[MEM]

Let me play politician and ask to "revise and extend my remarks".  There are 
asteroid gurus on the list who are more likely able to address this and I'd like 
to hear from them.  Your theory/question is partially in the right direction so 
let me re-frame it.  I believe we have "likely" detected all the existent 
asteroids in our inner solar system which are large enough to have formed 
basalt/cores--aka differentiated.  That size is hard overlook(100-300km 
minimum?).  I read somewhere that as many as 12-20 major/minor planets  would 
have formed in the early solar system that are no longer with us  as major/minor 
intact bodies.( i.e. absorbed or ejected)

As to meteorite parent bodies, what we have yet to inventory and, for which we 
have not had a specimen drop by Earth for comparison, are these long ago 
disrupted bodies.  These bodies  which now are represented only by minor, 
irregular, slivers, slices, and rubble piles within certain swarms of asteroids 
in different sectors of the solar system.

There is a "diogenite-like" spectrum coming from an outer-belt  asteroid whose 
orbit proves it cannot be  related to Vesta.   I mentioned the caveat that there 
may be some remnants of  asteroids which were differentiated in the early solar 
system and for  whatever reason are no longer in tact.  We may  only have a 
fraction of the original large body such that while we have  located all the 
differentiated intact ergo larger asteroids, we may need  to be looking for 
shards of former bodies to match meteorites from our  collections.  The reason 
all our "HED"s are from Vesta is probably that Vesta is on our  "mail route" and 
quantum transport from Vesta to Earth is a favorable  happenstance.

"1459 Magnya:  Orbits in the outer main belt, too far from Vesta to be 
genetically  related. May be the remains of a different ancient differentiated 
body  that was shattered long ago."  Spectrum is diogenite-like

Another candidate which may be the source of olivine-diogenites but is a chunk 
off Vesta:
"2579 Spartacus — contains a significant portion of olivine, which may indicate 
origin deeper within Vesta than other V-types."
See list at:
<http://en.wikipedia.org/wiki/V-type_asteroid>
<http://en.wikipedia.org/wiki/4_Vesta>

Pallas and its family of asteroids is certainly a candidate for one of the 
Carbonaceous parent body, even thought it shows no major excavations.
"2 Pallas is a large and most certainly differentiated body but lacks evidence 
of a deep
excavation and its spectrum shows carbonaceous chondrite affinities.  However 
75% of the astrtoids out there whose spectra we've measured fall in the C or 
Carbonaceous class."
<http://en.wikipedia.org/wiki/2_Pallas>
<http://en.wikipedia.org/wiki/Carbonaceous_chondrite>
 Also in my reading there is good indication that the Martian moons are captured 
carbonaceous asteroids
<http://en.wikipedia.org/wiki/Moons_of_Mars>

Asteroid types More than I can retain in my head:
<http://nineplanets.org/asteroids.html>
<http://en.wikipedia.org/wiki/Asteroid_spectral_types>
	* C-type, includes more than 75% of known asteroids: 	      extremely dark 
(albedo 0.03); 	      similar to carbonaceous chondrite meteorites; 	      
approximately the same chemical composition as the Sun minus hydrogen, helium 
and 	      other volatiles; 

	* S-type, 17%: relatively bright (albedo .10-.22); metallic 	      nickel-iron 
mixed with iron- and magnesium-silicates; 

	* M-type, most of the rest:  bright (albedo .10-.18); pure 	      nickel-iron. 
	* There are also a dozen or so other rare types. 

Read more about Asteroids  l  Asteroid facts, pictures and information by 
nineplanets.org	* C-type, includes more than 75% of known asteroids: 	      
extremely dark (albedo 0.03); 	      similar to carbonaceous chondrite 
meteorites; 	      approximately the same chemical composition as the Sun minus 
hydrogen, helium and 	      other volatiles; 

	* S-type, 17%: relatively bright (albedo .10-.22); metallic 	      nickel-iron 
mixed with iron- and magnesium-silicates; 

	* M-type, most of the rest:  bright (albedo .10-.18); pure 	      nickel-iron. 
	* There are also a dozen or so other rare types. 

Read more about Asteroids  l  Asteroid facts, pictures and information by 
nineplanets.org

Meteorites and their Parent Bodies 2nd Edition. Harry Mc Sween which I think us 
a google book online.

Elton



----- Original Message ----
> From: Richard Montgomery <rickmont at earthlink.net>
> To: Ron Baalke <baalke at zagami.jpl.nasa.gov>; Meteorite Mailing List 
><meteorite-list at meteoritecentral.com>
> Sent: Wed, April 13, 2011 8:39:46 PM
> Subject: Re: [meteorite-list] Cold Asteroids May Have A Soft Heart 
>(AllendeMeteorite)
> 
> Ron and List,
> 
> This new evidence fits exactly into the recent question I  posted, 'Vesta, 
> for sure?'
> 
> I only heard back from Elton (thanks,  sincerely!) and yet now with this 
> hypothesis, my question lingers as to the  absolute recognition of parent 
> bodies, with my query as to the  yet-undiscovered potential pairings of 
> undiscovered asteroids.
> 
> MEM  pointed out that the largest asteroids (aka Vesta etal) have already 
> been  located, with tell-tale impact and reflective signatures that rule out 
> other  parents for our HEDs.
> 
> My new question, neophyte layman as I am,  is:
> 
> Does this new data/theory bring my initial question about 
> Vesta-for-sure-as-parent-for-HEDs back into play?
> 
> -Richard  Montgomery
>