[meteorite-list] Marsden Canadian fall/first sedimentary meteorite??

From: Greg Catterton <star_wars_collector_at_meteoritecentral.com>
Date: Mon, 1 Dec 2008 15:10:24 -0800 (PST)
Message-ID: <809835.27437.qm_at_web45613.mail.sp1.yahoo.com>

It was only a matter of time for someone to try to pass off a fake meteorite from this fall.



--- On Mon, 12/1/08, ensoramanda <ensoramanda at ntlworld.com> wrote:

> From: ensoramanda <ensoramanda at ntlworld.com>
> Subject: Re: [meteorite-list] Marsden Canadian fall/first sedimentary meteorite??
> To:
> Cc: meteorite-list at meteoritecentral.com
> Date: Monday, December 1, 2008, 5:17 PM
> Hi All,
>
> Looks like the Canadian meteorite might be the first
> sedimentary ever
> found eh!!!! :-)
>
> http://cgi.ebay.co.uk/My-pet-Rock-found-south-east-of-Lone-Rock-Saskatchewan_W0QQitemZ260324758120QQcmdZViewItemQQptZLH_DefaultDomain_2?hash=item260324758120&_trksid=p3286.c0.m14&_trkparms=72%3A1301%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318
>
> Graham Ensor UK
>
> Rob Matson wrote:
>
> >Hi All,
> >
> >One aspect of this new Canadian fall amuses me in
> particular. In
> >the original report, we had quite a few
> "facts" about the bolide:
> >
> >
> >
> >>SASKATOON - A fireball that lit up the skies of
> Alberta and
> >>Saskatchewan last Thursday evening was a chunk of
> low-flying
> >>asteroid that weighed about 10 tonnes before it
> struck Earth's
> >>atmosphere, according to a University of Calgary
> investigation.
> >>
> >>
> >
> >
> >
> >>University of Calgary researcher Alan Hildebrand
> has outlined a
> >>region in western Saskatchewan where he expects to
> find desk-sized
> >>fragments of the space rock.
> >>
> >>
> >
> >Of course, these first two paragraphs are quite
> inconsistent with
> >each other -- a bolide that weighed only 10 tonnes
> *before* it hit
> >the atmosphere would be the size of a SINGLE desk.
> That's prior to
> >atmospheric ablation, which certainly would have
> reduced the mass
> >by 70-90%. How do you find "desk-sized
> fragments" on the ground
> >following ablation of a single desk-sized original
> object?
> >
> >
> >
> >>The fireball pierced the atmosphere at a steep
> angle of about
> >>60 degrees off the horizontal and lasted about five
> seconds.
> >>
> >>
> >
> >The steep entry angle suggests catastrophic break-up
> into many
> >pieces -- most of them small compared to the size of
> the original
> >meteoroid. Obviously not desk-sized or even
> television-sized. Mind
> >you, it's still an impressive fall. But I don't
> understand the
> >need for hyperbole.
> >
> >How quickly people forget that we had an asteroid of
> KNOWN size
> >(to within a factor of two) and orbit that entered over
> Sudan at
> >a lower initial velocity and a much shallower angle,
> and yet
> >"officials" poo-pooed that anything
> significant would reach the
> >ground. This asteroid was at least 40 tons and quite
> possibly
> >over 100 tons, had an orbit that intersected that of
> Mars
> >(suggesting a possible SNC), and impacted in a location
> that
> >would have been child's play to recover -- if it
> weren't for
> >the minor matter of its landing in a third-world,
> genocidal
> >disaster area of a country.
> >
> >I guess the point I'm trying to make is that the
> Sudan fall went
> >off the radar almost immediately, yet was a far more
> substantial
> >and scientifically important fall. But it seems not
> even meteorites
> >are immune from sectionalism. -Rob
> >
> >______________________________________________
> >http://www.meteoritecentral.com
> >Meteorite-list mailing list
> >Meteorite-list at meteoritecentral.com
> >http://six.pairlist.net/mailman/listinfo/meteorite-list
> >
> >------------------------------------------------------------------------
> >
> >
> >Internal Virus Database is out of date.
> >Checked by AVG - http://www.avg.com
> >Version: 8.0.175 / Virus Database: 270.9.10/1810 -
> Release Date: 24/11/2008 14:36
> >
> >
> >
> ______________________________________________
> http://www.meteoritecentral.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list


      
Received on Mon 01 Dec 2008 06:10:24 PM PST