[meteorite-list] nwa869

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Thu Apr 22 10:00:05 2004
Message-ID: <20020707195616.63283.qmail_at_web11603.mail.yahoo.com>

Hi Al -

I don't know if it can be claimed at the present time
that these particular asteroids are the parent bodies.

It may simply be that the parent bodies are similar in
composition to these particular asteroids, in other
words that there may be 2 or more asteroids of roughly
the same type of composition.

ah well, some year it will all be clear...

ep

--- almitt <almitt_at_kconline.com> wrote:
> Hi John and all,
>
> Many of the parent bodies have yet to be identify to
> the many of the meteorites we
> have accumulated here on Earth. However there are
> some suspect parent bodies which
> have been identified by spectral matches to the
> asteroids and meteorites. One such
> match is asteroid Hebe for the H type chondrites. It
> is obvious from looking at Hebe's
> surface that it has a variation in spectra as the
> asteroid rotates representing the
> different metamorphism (classes) we see from the
> change in olivine to pyroxene ratio.
> No doubt the asteroid had a large enough impact at
> one time to knock it apart allowing
> the more differentiated classes to show up on the
> outside, and some of the outer part
> of the asteroid became buried in the interior as it
> reassembled into a rubble pile
> asteroid. It isn't uncommon for H type chondrites to
> have brecciation of various
> different classes all in one meteorite. A good
> example of this is Zag (H3-6) and
> Noblesville, Indiana an H4 chondrite with H6 clasts.
> Probably why we get so many of
> the H type chondrite material now is we are living
> at a time when the results of the
> impacts which have been migrating to us over the
> eons have finally made their way to
> fall at a constant rate. If we lived in a different
> time many years from now or very
> long ago then perhaps and most likely we would
> sample some other type of meteorite
> falls. Perhaps it wouldn't be uncommon for some rare
> type meteorite (to us) to fall at
> a regular more consistent rate.
>
> How does this tie into NWA 869. As stated earlier we
> don't know all of the parent
> bodies yet (a good reason for funding to NASA to
> build a craft to visit as many
> asteroids as we can) However there is one asteroid
> of about 7 km in diameter that
> resides in the main belt and may be related to the L
> type chondrites and a possible
> parent body though a very weak link. Asteroid 3628
> Boznemcova exhibits spectral
> qualities to the L's and LL's. It is obviously too
> small to be a complete asteroid and
> has been suggested it is a fragment of a much larger
> asteroid. Perhaps this might be
> what is left of the NWA 869 and other L type
> meteorites and why we sample a steady
> rate of L type chondrites.
>
> Beside these parent bodies, we are fairly sure of
> the Vesta and HED type meteorite
> connections as well as the Martian (SNC), and lunar
> meteorite to Moon connections.
> It's what makes reading about and research on
> meteorites so exciting and trying to
> figure out all of the complicated puzzles they
> present to us.
>
> --AL Mitterling
>
>
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>
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Received on Sun 07 Jul 2002 03:56:16 PM PDT