Hi List....this is a completely neophyte question, so please accept my
ignorance in things astronomic....and allow me to ask you experts:
I have always wondered why Vesta is the parent-body-de-jur for our HEDs,
when so many unfound asteroids are no doubt cruizing around out there.
Hence my question: Have any asteroids been "paired" yet, and if not, why
Vesta alone gets the credit; as well, couldn't our HED cousins be cousins
from a yet-to-be-discovered asteroid pairing?
As you true scientists of course recognize, I'm completely green in this
area. I guess it's my timeless query (X-factors-we-need-to consider) that
has me bewildered. Has Vesta somehow distinguished itself as the
one-and-only parent-body?
I do understand reflection technology has identified our HED meteorites to
be from Vesta, but why not an undiscovered twin? Or many multiple twins?
With deference to those of you already in the know,
Richard Montgomery
----- Original Message -----
From: <[email protected]>
To: "Michael Gilmer" <[email protected]>
Cc: <[email protected]>; "Shawn Alan"
<[email protected]>
Sent: Thursday, April 07, 2011 4:39 PM
Subject: Re: [meteorite-list] List of meteorites from Vesta?
Hi Michael:
Yes, there is a smoking gun and a trail of dust, too.
Reflectance spectra of Vesta and areas of Vesta consistent with spectra of
HED meteorites and composition of HEDs.
Big crater that could be the source of said meteorites.
Vestoids in an area where asteroids can be tossed out of the asteroid belt
into Earth-crossing orbits.
Vestoids IN Earth-crossing orbits. Short of a sample return, not sure what
more evidence you need (smoking gun but not a confession).
Larry
Hi Shawn, Larry, and Expat Vestans,
I included Dunite in my answer to Regine's question because I wanted
to be "all inclusive". Of course, the old axiom of "damned if you,
damned if you don't" comes into play here. Had I left out Dunite,
someone would have inevitably suggested it. Since I included it, the
inevitable question of whether or not it actually belongs was brought
up. This highlights the uncertainty inherent in theorizing about
other worlds that we lack first-hand knowledge of.
Even the widely-accepted HED's are theoretically assigned to Vesta.
There is no "smoking gun" yet that any meteorite originates from Vesta
- at least that is my understanding of the HEDO group. But, so much
"circumstantial" evidence points to Vesta, that it is generally agreed
upon to be the parent body of the HEDO group. I don't think anyone is
expecting the Dawn mission to disprove this theory. Everyone expects
Dawn to confirm what the circumstantial evidence has implied - that
the HEDO group is truly Vestan.
While olivine diogenite may not appear in the "official"
classification tree, NWA 1877 is classified as "diogenite-an" (of
which, there are only two approved as such). There other is Grosvenor
Mountains 95555, which is described in the write-up as
"diogenite-unique", but looks like an olivine diogenite. Note, there
is at least one possible pairing to NWA 1877 floating around and NWA
6149 comes to mind. (although the latter may not be officially paired
yet)
Note, NWA 6149 (and 5 others) are classified as "diogenite-olivine" -
3 of the others are NWA and one is Antarctic. The earliest apparent
classification for this type (that appears in the Bulletin) is NWA
5603. (2004)
Best regards,
MikeG
----------------------------------------------------------------------
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On 4/7/11, Shawn Alan <[email protected]> wrote:
Larry and Listerites
Thank you Larry for the links..... But I think my question is still
unanswered or it hasn't been directly spelled out, which I am that type
of
person that needs it all. I do not see Olivine diogenite, and Dunite on
the
classification menu on the Meteoritical Bulletin Database (MBD) which is
the
BIBLE of all bibles when it comes to classification of meteorites. So
what I
am gathering at this time is that these two classes or sub or non at
this
time are not recognized by the MBD as a classification. Am I right? If
it
was wouldn't it be listed on the MBD as one. So do this mean its a
subclass
or something else. I have heard from some that dunites are not a
meteorite
classification. I have to believe that statement could be true because I
don't see dunites coming up on the MDB classification menu or Olivine
diogenites. By chance who coined these quote un quote classifications
and
why haven't they been listed on the MBD. I find it odd, but again I
have seen a few meteorites get these weird names or nick names to
create a
buzz.
Shawn Alan
IMCA 1633
eBaystore
http://shop.ebay.com/photophlow/m.html
--- On Thu, 4/7/11, [email protected] <[email protected]>
wrote:
From: [email protected] <[email protected]>
Subject: Re: [meteorite-list] List of meteorites from Vesta?
To: "Shawn Alan" <[email protected]>
Cc: [email protected], [email protected]
Date: Thursday, April 7, 2011, 5:40 AM
Hi Shawn:
I do not think anyone responded to your question about olinive-bearing
diogenites.
Here is a links to articles:
http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1502.pdf
http://www.lpi.usra.edu/meetings/lpsc2008/pdf/1835.pdf
Sorry, but have not been keeping up on the subject.
Larry
Hello Mike, Regine, and Listers
Regine there are 486 HED meteorites that are non Antarctica. Mike and
Listers I have a question... I was trying to search for the other two
HEDOD.... Olivine diogenite, and Dunites on the Meteoritical Bulletin
Database and under class they do not have those listed. Am I missing
something? Or am I overlooking the classes and I need glasses?
Shawn Alan
IMCA 1633
eBaystore
http://shop.ebay.com/photophlow/m.html
[meteorite-list] List of meteorites from Vesta?Michael Gilmer
meteoritemike at gmail.com
Wed Apr 6 22:58:02 EDT 2011
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Hi Regine,
All HEDOD meteorites are assumed to be Vestan in origin - Howardite,
Eucrite, Diogenite, Olivine diogenite, and Dunite. :)
Best regards,
MikeG
----------------------------------------------------------------------
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On 4/6/11, Regine Petersen <fips_bruno at yahoo.de> wrote:
Hi all,
Is there a list of assumed Vesta meteorites?
Regine
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