[meteorite-list] hot meteorites

From: Matteo Chinellato <mcomemeteorite2000_at_meteoritecentral.com>
Date: Thu Apr 22 09:41:09 2004
Message-ID: <20010212213609.58403.qmail_at_web10304.mail.yahoo.com>

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
>
> _______________________________________________
> Meteorite-list mailing list
> Meteorite-list_at_meteoritecentral.com
>
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=====
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Received on Mon 12 Feb 2001 04:36:09 PM PST