AW: Re-2: [meteorite-list] Moss Meteorite From A Comet?

From: Ingo Herkstroeter <metopaster_at_meteoritecentral.com>
Date: Mon Aug 21 10:38:13 2006
Message-ID: <000101c6c52f$9079e440$0873a8c0_at_Geobase>

Hi Folks!

We have to be very careful about the "Chiemgau Comet Impact". To my
knowledge it's not clear, what we have there! Most scientist think, that
this is not an impact field, only a hand full do.

Ingo

-----Urspr?ngliche Nachricht-----
Von: meteorite-list-bounces_at_meteoritecentral.com
[mailto:meteorite-list-bounces_at_meteoritecentral.com] Im Auftrag von E.P.
Grondine
Gesendet: Montag, 21. August 2006 15:53
An: meteorite-list_at_meteoritecentral.com
Betreff: Re: Re-2: [meteorite-list] Moss Meteorite From A Comet?

Hi Larry, List -

It appears we have at least one other comet sample:
Cheimgau.

good hunting,
Ed


--- Larry Lebofsky <lebofsky_at_lpl.arizona.edu> wrote:

> Hi all:
>
> Defending Tim Swindle and Humberto Campins. I have
> known them for years and
> they are very conservative scientists. Their work is
> good and they are well-
> respected scientists. They do not go off (too often)
> to make wild,
> unsubstantiated, claims., hence, the conclusions in
> their article. They based
> their Meteorite paper (and their original scientific
> paper) on what we know.
> We have observations of many comets (Campins has
> done a lot of this), but we
> have "samples" from only one comet (Halley), are
> just now studying Stardust
> material (so too early to say much), and IDPs which
> are thought to be, at
> least in part, cometary in origin.
>
> Clearly, we need multiple samples from multiple
> comets --- good luck in our
> lifetime. Therefore you base your "theories" on the
> existing information, not
> onwhat you hope to have in the future. That is why
> people propose new missions
> to comets and asteroids!
>
> We know that not all comets are the same based on
> our observations and where
> we think they came from. Some of this may be because
> of how many times they
> have been close to the Sun, some may have to be
> related to where they came
> from (Kuiper Belt or Oort cloud), and some may have
> to do with where they were
> formed (which may not have been where we see them
> coming from). Clearly, a
> chunk of a "fresh" comet would look very different
> from a "dead" comet. Or, as
> been on this listserv recently, could we tell the
> difference between a chunk
> of a comet or a piece of Ceres? I am not sure I
> would be willing to say
> anything in print even though I have studied Ceres
> for years. What, from
> either, would we expect to make it through the
> atmosphere?
>
> Even if we were to bring back samples from two or
> three comets, I doubt if
> anyone I know would be willing to say (with respect
> to the composition of
> comets) that that was their "final answer." That is
> the nature of science.
>
> I really have to stop writing these a 5:00 in the
> morning, no breakfast and no
> soffee, but this is the quiet time of the day.
>
> Larry
>
>
>
> Quoting bernd.pauli_at_paulinet.de:
>
> > "Comets ... being 'primitive material' ... we
> would need
> > to have known multiple samples of multiple comets
> before
> > we could say for sure."
> >
> > Hi Mark and List,
> >
> > I couldn't agree more and that's why I felt a bit
> uneasy when I read
> > Campins' and Swindle's article in this issue of
> our METEORITE magazine:
> >
> > CAMPINS H. and SWINDLE T.D.(2006) Where are the
> cometary
> > meteorites? (Meteorite, May 2006, Vol. 12, No.2,
> pp. 17-19).
> >
> > They solely refer repeatedly to Comet Halley and
> to Halley dust (plus to
> > cometary IDPs). Many more comets need to be
> sampled before we can draw
> > definite conclusions!
> >
> > Best,
> >
> > Bernd
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list_at_meteoritecentral.com
> >
>
http://six.pairlist.net/mailman/listinfo/meteorite-list
> >
>
>
> ______________________________________________
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>
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>


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Received on Mon 21 Aug 2006 10:39:10 AM PDT