[meteorite-list] Stardust & Meteorites

From: star-bits_at_comcast.net <star-bits_at_meteoritecentral.com>
Date: Sat Mar 18 11:26:02 2006
Message-ID: <031720062236.25253.441B39CF000E372B000062A522007613949C9B070DD39D0E9B9C_at_comcast.net>

Ron Baalke wrote:

<Now that it looks like comets can form close the the Sun, well inside the orbit
of Mercury, this weakens the case for E chondrites as having planets
as their parent bodies. The E chondrites formed inside of Earth's orbit, and
there was speculation they may possibly have come from either Mercury or Venus.>

    Both Mercury and Venus are completely differentiated bodies. There is zero chance of any chondrite of any type coming from either of these planets.
The speculation must have been from someone with little knowledge of planetary formation.

--
Eric Olson
ELKK Meteorites
http://www.star-bits.com
 -------------- Original message ----------------------
From: Ron Baalke <baalke_at_zagami.jpl.nasa.gov>
> 
> Hi,
> 
> During yesterday's press conference, Mike Zolensky mentioned that the minerals
> seen so far in Stardust's comet samples match the CH chondrites the best. The
> CI chondrites were always suspected to be cometary in nature because of their
> high water content.
> 
> Now that it looks like comets can form close the the Sun, well inside the orbit
> of Mercury, this weakens the case for E chondrites as having planets
> as their parent bodies.  The E chondrites formed inside of Earth's orbit, and
> there was speculation they may possibly have come from either Mercury or Venus.
> But now the Stardust results indicates small bodies can originate close to the
> Sun.
> 
> Ron Baalke
> 
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Received on Fri 17 Mar 2006 05:36:00 PM PST