[meteorite-list] List of meteorites from Vesta?

From: Michael Gilmer <meteoritemike_at_meteoritecentral.com>
Date: Thu, 7 Apr 2011 21:14:34 -0400
Message-ID: <BANLkTimf1eAb=u=tL6MoZOJ8MJe7Ux0_Hg_at_mail.gmail.com>

Hi Larry and List,

I stand corrected. We don't have a smoking gun, but we do have a
smoking crater on Vesta. :)

I didn't mean to imply that the origin of HEDs was still in doubt.
But rather, just to point out that the Vestan origin is a theory, like
relativity or evolution. We *know* them to be true, and we can
produce evidence that supports the theory, but is the Vesta-HED
connection as sure as the lunar or martian meteorite connection?

We have moon rocks brought back by Apollo astronauts to compare
first-hand with lunar meteorites. We have atmospheric data from
Sojourner that we can compare directly with trapped gas in Martian
meteorites. Those two connections are rock solid, pun intended.

With Vesta, we have spectral analysis and a host of other convincing
data (as Larry pointed out), but do we have the kind of solid evidence
needed to rule out all other possible parent bodies?

I'm guess what I am asking here is this - are there any holdouts in
the scientific community who are not convinced that HEDs are from
Vesta? And if so, will data from the Dawn mission finally push them
into the "yes" camp?

It was my understanding that in the spectrum of parent body and
meteorite matching, the Vesta connection was right below lunar and
mars, but well above angrites and Mercury.

Best regards,

MikeG

----------------------------------------------------------------------
Mike Gilmer - Galactic Stone & Ironworks Meteorites

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-----------------------------------------------------------------------




On 4/7/11, lebofsky at lpl.arizona.edu <lebofsky at lpl.arizona.edu> wrote:
> 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
>>
>> ----------------------------------------------------------------------
>> Mike Gilmer - Galactic Stone & Ironworks Meteorites
>>
>> Website - http://www.galactic-stone.com
>> Facebook - http://www.facebook.com/galacticstone
>> News Feed - http://www.galactic-stone.com/rss/126516
>> Twitter - http://twitter.com/galacticstone
>> EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564
>> -----------------------------------------------------------------------
>>
>> On 4/7/11, Shawn Alan <photophlow at yahoo.com> 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, lebofsky at lpl.arizona.edu <lebofsky at lpl.arizona.edu>
>>> wrote:
>>>
>>>
>>> From: lebofsky at lpl.arizona.edu <lebofsky at lpl.arizona.edu>
>>> Subject: Re: [meteorite-list] List of meteorites from Vesta?
>>> To: "Shawn Alan" <photophlow at yahoo.com>
>>> Cc: fips_bruno at yahoo.de, meteorite-list at meteoritecentral.com
>>> 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
>>>>
>>>>
>>>> Previous message: [meteorite-list] List of meteorites from Vesta?
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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
>>>>
>>>> ----------------------------------------------------------------------
>>>> Mike Gilmer - Galactic Stone & Ironworks Meteorites
>>>>
>>>> Website - http://www.galactic-stone.com
>>>> Facebook - http://www.facebook.com/galacticstone
>>>> News Feed - http://www.galactic-stone.com/rss/126516
>>>> Twitter - http://twitter.com/galacticstone
>>>> EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564
>>>> -----------------------------------------------------------------------
>>>>
>>>> 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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>>>>
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> ----------------------------------------------------------------------
>>>> Mike Gilmer - Galactic Stone & Ironworks Meteorites
>>>>
>>>> Website - http://www.galactic-stone.com
>>>> Facebook - http://www.facebook.com/galacticstone
>>>> News Feed - http://www.galactic-stone.com/rss/126516
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>>>> -----------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>>
>>>>
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>>
>>
>> --
>>
>
>
>

--

Received on Thu 07 Apr 2011 09:14:34 PM PDT