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 <[EMAIL PROTECTED]> 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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