[meteorite-list] Meteor shower meteorite dropping events

From: Jason Utas <meteoritekid_at_meteoritecentral.com>
Date: Wed, 11 Aug 2010 22:18:37 -0700
Message-ID: <AANLkTimXXVR3h7d1JZgq07UYy27gguXWQhBOT-2QLSkA_at_mail.gmail.com>

Hello Chris, Eric,
The simple answer is no. No meteorites have ever been found that
match all criteria for what we believe cometary material should look
like.

http://www.lpi.usra.edu/meetings/LPSC98/pdf/1004.pdf

This is also the sort of topic that has been brought up again and
again on the list. While I couldn't find any direct references for
some reason, I was able to turn these up:

http://www.mail-archive.com/meteorite-list at meteoritecentral.com/msg84604.html

http://six.pairlist.net/pipermail/meteorite-list/2004-May/000683.html

To condense: a few meteorites, namely the CI's, come close to what we
think cometary material might look like. But those meteorites weren't
associated with any known meteor showers, and are likely just
fragments of D-class asteroids, which may or may not be remnants of
"burned-out" comets (comets that got trapped in the inner solar system
and stripped of most of their volatiles).
But, based on the above paper, even the CI's are probably not actual
"cometary" material, though they fit the bill better than most other
meteorites, for sure.

Suggesting that an iron meteorite like Mazapil might be associated
with a comet is nigh on preposterous - comets aren't made of iron, and
shouldn't have anything to do with such a meteorite. Comets are
undifferentiated bodies that have generally remained icy since their
formation over four and a half billion years ago. A two or three
billion year old iron with a thompson structure that took the better
part of a billion years to form simply could not be from a comet.

http://adsabs.harvard.edu/abs/2002M%26PS...37..649B

Some more basic reading:

http://www.amsmeteors.org/faqm.html#11

Scroll to section before bottom: "Meteorites from Comets?"

http://www.pibburns.com/catastro/meteors.htm

Best,
Jason


On Wed, Aug 11, 2010 at 9:34 PM, Meteorites USA <eric at meteoritesusa.com> wrote:
> Thanks for posting this Chris... This sounds like a good topic for an
> article for my magazine. If you're interested in it, and/or would like to
> write for the mag on this topic let me know. Anyone have a working theory
> based on evidence of this associative phenomena? I've heard many people
> suggest that meteor showers don't drop meteorites. Then I've heard people
> associate meteorite falls that happen during meteor showers with said
> shower. And I've also heard that people believe that there is ZERO
> connection and it's purely coincidence.
>
> So which is it? yay or nay, or maybe? or no one really knows...?
>
> Eric
>
>
>
> On 8/11/2010 8:59 PM, Chris Spratt wrote:
>>
>> I know of one meteor shower (November Andromedids) where an iron meteorite
>> fell in Mazapil, Mexico during the shower.
>>
>> Are there any similar events?
>>
>> Chris Spratt
>> Victoria, BC
>> (Via my iPhone)
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Received on Thu 12 Aug 2010 01:18:37 AM PDT