[meteorite-list] check out Vesta

From: Dave Mouat <dmouat_at_meteoritecentral.com>
Date: Thu Apr 22 10:25:41 2004
Message-ID: <3EC900B1.11866C78_at_dri.edu>

Dear Listees:
Speaking of Millbillillie, I easily spotted Vesta last night with a good pair of
binoculars. It doesn't hurt that I'm observing from 6,000' (1800m). It is
about 1/5th the way from Denebola to Spica. The star charts from Sky and
Telescope's April, May, and June issues really help as they show its position
relative to some very nearby stars; it has also been moving slowly the past few
nights (and most likely the next few!!) from Denebola toward Spica. The
movement pretyy much ascertains it as an asteroid. It's nice to be able to see
where your eucrites, howardites, and diogenites most likely came from.
Cool viewings
Dave

bernd.pauli_at_paulinet.de wrote:

> > Hullo,
>
> Hello Dave and List,
>
> > Millbillillie is from a differentiated body I just wondered if it was that
> > much younger (say 4.4Gy) as there had to be an elapsed time for the
> > formation of the eucritic parent body (Vesta, as presently received)?
>
> Here is some information from an article by Yamaguchi:
>
> YAMAGUCHI A. et al. (1994) Textural variations and impact
> history of the Millbillillie eucrite (Meteoritics 29, 237-245):
>
> In table 4, page 244, Yamaguchi et al. present a chronological scenario
> concerning the formation of five classified lithologies of the Millbillillie
> eucrite.
>
> Stage #1: primary crystallization age of eucrites in general ~4.46-4.56 Ga
>
> Stage #2: Impact (brecciation, melting, mixing, deposition)
>
> Stage #3: Thermal annealing - Granoblastic matrix (3.55 Ga ?)
>
> Stage #4: Impact - Glassy veins (3.55 Ga ?)
>
> Stage #5: Impact - Microcracks
>
> Best regards,
>
> Bernd
>
> To: entropydave_at_ntlworld.com
> Cc: Meteorite-list_at_meteoritecentral.com
>
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Received on Mon 19 May 2003 12:05:05 PM PDT