[meteorite-list] Cali chondrite fell extremely cold!

From: Michael Farmer <meteoriteguy_at_meteoritecentral.com>
Date: Sat, 28 Jul 2007 19:22:58 -0700 (PDT)
Message-ID: <682324.7798.qm_at_web33114.mail.mud.yahoo.com>

I would certainly think that the interior of a large
body would be ~ -400 degrees right, and mostly should
not heat up during flight. I never understand why some
come down so cold, and others are reported to be very
hot.
Mike


--- Alexander Seidel <gsac at gmx.net> wrote:

> Mike, your comment was obviously triggered by my
> earlier post to the list this day. I always thought
> stones of a meteorite fall would be rather "cold"
> after touchdown. Then again one has to look at
> typical equilibrium temps for a tumbling stone
> meteoroid at a typical Earth orbit cruising distance
> before encounter with the Earth atmosphere. There
> were several posts about this on the list in the
> past, may be someone can retrieve them from the
> archives. The hot phase of atmospheric entry, before
> reaching the retardation point, will most likely
> only affect the very outer zones of a meteoroid
> large enough to not disintegrate, while the inner
> parts will remain effectively at the former
> equilibriums temps due to a rather low heat transfer
> process for typical stony meteorites in the few
> seconds or minutes of atmospheric transit. And the
> final dark flight will cool down the former
> temporary high temps on the outsides of the stone
> pretty soon.
>
> If I ever had the chance to pick up a freshly fallen
> stone immediately after the event, I would expect it
> to be rather "cold" to the touch.... :)
>
> Alex
> Berlin/Germany
>
> -------- Original-Nachricht --------
> Datum: Sat, 28 Jul 2007 18:33:24 -0700 (PDT)
> Von: Michael Farmer <meteoriteguy at yahoo.com>
> An: meteorite-list at meteoritecentral.com
> Betreff: [meteorite-list] Cali chondrite fell
> extremely cold!
>
> > Ok, here is a good starting discussion topic for
> this
> > meteorite fall.
> > We had people in two of the four homes hit who
> picked
> > up the meteorites within seconds of the impact.
> > Cali#003 and Cali#004. Both people said that the
> > pieces were very cold, so cold they quickly put
> them
> > down. These people live near the equator, so the
> > meteorites must have been quite cold.
> > How many other meteorites have been reported to be
> > very cold? I know that Hvittis and St Michel if I
> > recall were said to have frost on them almost
> > immediately after the fall, is that correct?
> > Michael
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> >
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Received on Sat 28 Jul 2007 10:22:58 PM PDT