[meteorite-list] hot meteorites

From: Meteordealer <meteor.dealer_at_meteoritecentral.com>
Date: Thu Apr 22 09:41:09 2004
Message-ID: <001201c09544$60231300$bd7e0304_at_vz.dsl.genuity.net>

   It's ridiculous to believe that a meteorite can get hot enough on the
exterior to form a fusion crust then be cold as soon as it hits the ground.
There are too many reports of meteorites being hot to the touch and singing
objects to say they are cold when they fall. Some people say that during a
meteorite's flight the hot areas simply ablate away leaving behind cold
stone or iron. If that were true there would be no fusion crust on any
meteorite. There was even a stone from the Portales Valley fall with a piece
of plastic melted to it after landing on a plastic object.

Brad Sampson
meteor.dealer_at_gte.net

----- Original Message -----
From: "Matteo Chinellato" <mcomemeteorite2000_at_yahoo.it>
To: "Donald Blakeslee" <blakesle_at_twsuvm.uc.twsu.edu>;
<meteorite-list_at_meteoritecentral.com>
Sent: Monday, February 12, 2001 4:36 PM
Subject: Re: [meteorite-list] hot meteorites


> Hello all
>
> An article on Alfianello and Trenzano meteorites exit
> probably in the next number of METEORITE! for
> Farmington I have a 279 gr. slice for sale.
> Regards
>
> matteo
>
> --- Donald Blakeslee <blakesle_at_twsuvm.uc.twsu.edu> ha
> scritto: > I wonder if a little mose discussion might
> be
> > warranted. High speed planes
> > land hot, but meteorites are supposed to land cold
> > after having been heated
> > to the point where the surface melts. The
> > explanation that meteors ablate
> > and jets do not has been offered, but this doesn't
> > account for the
> > difference fully.
> >
> > The meteor is hot enough to ionize the air until it
> > reaches its point of
> > retardation. As it continues to slow down, the air
> > will cool it, but so
> > long as it is traveling at the speed of a jet, air
> > cannot cool it to a
> > point cooler than the jet planes. Only when the
> > meteorite is slowed to a
> > much lesser speed can air cool it.
> >
> > Clearly the fact that the interior of the meteorite
> > is cold is an important
> > factor in re-cooling the surface. I tend to agree
> > with the idea that a
> > very freshly fallen meteorite can feel hot to a
> > human hand but that left
> > alone for a while, it will cool rapidly, expressing
> > the interior temperature.
> >
> > Farrington's 1915 catalog of meteorites has lots of
> > details of falls, and
> > in the large majority of cases where temperature is
> > reported, they were
> > hot. This is true even if you throw out the clearly
> > loony reports of
> > incandescent stones. Here is a list I compiled.
> >
> > Hot Meteorites
> > Name Date Weight Description
> > Alfianello 1883 228 alleged to have singed the grass
> > slightly (Heide
> > 1964:23)
> > Farmington 1890 90 hot when dug up (Farrington
> > 1915:185)
> > Ferguson 1889 77.5 too hot to hold
> > Cabin Creek 1886 48.6 hot (Farrington 1915:89)
> > New Concord 1860 46.8 as though it had lain on the
> > ground exposed to
> > the sun's rays (Farrington 1915:330)
> > Warrenton 1877 45.5 snow was melted and frozen
> > ground
> > thawed, but pieces, though warm, were
> > easily handled (Farrington 1915:476).
> > Braunau 1847 39 too hot to touch for 6 hours
> > (Bagnall 1991: 16)
> > Allegan 1899 31.8 too hot to handle (Farrington
> > 1915:30)
> > Juromeha 1968 25.3 incandescent when discovered;
> > still warm next morning
> > Bath 1892 21.2 had to use gloves (Farrington
> > 1915:48)
> > Nanjemoy 1825 7.44 sensibly warm (Farrington
> > 1915:324)
> > Searsmont 1871 5.4 quite hot (Farrington
> > 1915:406)
> > Mazapil 1885 3.95 still luminescent for a while
> > after impact, hot when
> > finally picked up, could barely be handled
> > (Farrington 1915:299)
> > Lucé 1768 3.5 too hot to handle (Burke 1986:27-28)
> > Tomatlan 1879 0.9 still at a burning heat
> > Cross Roads 1892 0.17 grass near the spot was dead
> > and looked as if it
> > had been killed by fire (Farrington 1915:150)
> > Queen's Mercy 1925 ?? smoking hot; burned a woman's
> > hand (Burke 1986:226)
> > Cold Meteorites
> > Dhurmsala 1860 150 had frost on its surface when
> > recovered
> > (Burke 1986:100)
> > Forest City 1890 36.4 fell on dry grass but did not
> > char it
> > (Farrington 1915:198)
> > Drake Creek 1827 5.2 cold when freshly fallen
> > (Farrington 1915:168)
> > Harrison Co. 1859 0.7 not warm
> > Lumpkin 1869 0.4 neither hot nor cold
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Don Blakeslee
> > Department of Anthropology
> > Wichita State University
> > Wichita, KS 67230-0052
> >
> > _______________________________________________
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> >
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>
>
> =====
> M come Meteorite - Matteo Chinellato
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> Email: mcomemeteorite2000_at_yahoo.it
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Received on Mon 12 Feb 2001 05:37:25 PM PST