[meteorite-list] Carancas meteorite crater

From: ensoramanda <ensoramanda_at_meteoritecentral.com>
Date: Fri, 05 Oct 2007 18:12:21 +0100
Message-ID: <47067075.1040506_at_ntlworld.com>

Hi,

I have some new more detailed photos of the crater just sent to me
...will try and get them somewhere with a link...soon

Rob McCafferty wrote:

>I remember doing calculations at university to
>estimate the size of an impact crater and for a rock
>maintaining it's cosmic velocity, it tends to be
>around 20:1.
>
>The conditions for surviving to the surface are quite
>exacting and with chondrite craters such a rarity, are
>we looking at an absolute ideal angle and speed for
>this not to disintegrate or slow down completely on
>its descent.
>And I apologise if this answer has already been given,
>but what mass/dimensions was the impactor likely to
>have had? I suspect a 1m diameter rock is consistent
>with a proper crater of this size. While this may be a
>3tonne rock most of it would be destroyed by the
>impact if it retained much of its cosmic velocity.
>This seems consistent with the few fragments though
>backward spallation. While I find the prospect of
>ablation right to the surface unappealing, I don't
>believe it could have made a crater rather than a
>tunnel had it not been going at several km/s when it
>hit that wet ground.
>It's just it seems such a rare occurence, I wonder if
>we're looking at a special case for incoming bolides
>here, with very narrow limits on angle, speed and
>meteor structure.
>If this crater, the fragments and the witness reports
>are properly studied, this fall has the potential to
>improve our understanding of the dynamics involved.
>Very interesting stuff
>Rob McC
>--- Michael Farmer <meteoriteguy at yahoo.com> wrote:
>
>
>
>>http://www.star-bits.com/impact-craters.htm
>>
>>Hi everyone, Eric Olson is at my house to see the
>>Carancas meteorites, and he asked me to post this
>>link.
>>
>>It is a list of every known impact crater of more
>>than
>>10 meters in diameter, from which meteorites had
>>been
>>found. Of all of those craters, not one, ZERO is
>>associated with a chondrite. Jilin and Norton
>>County,
>>both masses well over a ton, had craters less than
>>50%
>>the size of the Carancas meteorite. This is very
>>interesting and proves how rare such a chondrite
>>fall
>>is!
>>
>>Michael Farmer
>>
>>I am ready to forget and ignore the controversy and
>>focus on the science of this spectaclar event at
>>this
>>time, I have had my say and told my story.
>>
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Received on Fri 05 Oct 2007 01:12:21 PM PDT