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Re: (meteorobs) Fwd: "CLOSEST FLYBY EVER"
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To: meteorobs@atmob.org
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Subject: Re: (meteorobs) Fwd: "CLOSEST FLYBY EVER"
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From: "Ed Cannon" <ecannon@mail.utexasdot edu>
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Date: Fri, 19 Mar 2004 03:54:19 -0000
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Delivered-To: meteorobs-mhonarc2@galaxy.atmob.org
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Delivered-To: meteorobs@atmob.org
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In-Reply-To: <0d9f01c40d09$9ae2fb50$9101a8c0@upstreambos.com>
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> > > The object, dubbed 2004 FH, is probably only about 20 meters in
> > > diameter (the size of a house).
For comparison, here are a few estimates of the object that
made the Barringer Crater in Arizona -- quoted from
http://www.barringercrater.com/science/ --
"The meteorite which made it was composed almost entirely
of nickel-iron.... It was 150 feet [about 50 meters] across,
weighed roughly 300,000 tons, and was traveling at a speed
of 40,000 miles per hour. The force generated by its impact
was equal to the explosion of 20 million tons of TNT."
So 2004 FH is about 40% of the diameter, but I guess that's
about all we know. I wouldn't want to be anywhere nearby if
it hit the Earth. Ditto with the Daylight Fireball of
August 1972.
Congratulations to Rob McNaught and colleague on seeing
2004 FH!
Ed Cannon - Austin, Texas, USA
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