[meteorite-list] Fw: Grimsby, Ontario bolide info

From: Darren Garrison <cynapse_at_meteoritecentral.com>
Date: Thu, 15 Oct 2009 15:04:09 -0500
Message-ID: <t00fd5peur3b9o45pjr0kt8mv5b4u4cslr_at_4ax.com>

To: <cynapse at charter.net>,
    <meteorite-list at meteoritecentral.com>
Subject: Grimsby, Ontario bolide info
From: "Matson, Robert D." <ROBERT.D.MATSON at saic.com>
Date: Thu, 15 Oct 2009 11:16:08 -0700

Hi Darren,

(Please feel free to forward to the list on my behalf.)

At the beginning of the week I contacted Dr. Peter Brown at University
of Western
Ontario, letting him know that the Grimsby bolide terminal burst had
been captured
on NexRad Doppler radar images taken in Buffalo, New York. I created
several maps
of the radar returns at three different altitudes, showing that the
terminal burst
location is in perfect agreement with UWO's solution (triangulated from
seven
all-sky cameras). I shared this information with Dr. Tony Phillips at
SpaceWeather,
and he has provided links on his site to a couple of the radar images I
created:

http://www.spaceweather.com/archive.php?view=1&day=12&month=10&year=2009

A wide-area map is here:

http://www.spaceweather.com/swpod2009/13oct09/Grimsby_5100m.jpg

And a second map zoomed in on the terminal burst cloud is here:

http://www.spaceweather.com/swpod2009/13oct09/Grimsby_Zoom_5100m.jpg

As the filenames suggest, the Doppler beam altitude at this location was
a little
over 5 km, and the area covered is roughly a mile wide by 2 miles long.
(There
were also colocated radar returns at 6.5 km and 3.7 km, though the
largest
returns were at 5.1 km.) Judging from where meteorites were found in
Park
Forest and Ash Creek (West), I would expect a number of meteorites to be
found
directly beneath the strongest radar returns, with sizes generally
increasing
as you move to the east-southeast.

I have not yet seen any images of the purported golf-ball-sized
meteorite that
hit the SUV, nor do I know where this SUV was parked, so can't judge
whether
it's a legitimate possibility.

--Rob

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Darren
Garrison
Sent: Thursday, October 15, 2009 11:33 AM
To: meteorite-list at meteoritecentral.com
Subject: [meteorite-list] Time to play "Hammer or Scammer"

http://www.stcatharinesstandard.ca/ArticleDisplay.aspx?e=2127299

 Grimsby meteorite found
Updated 32 mins ago
        

The Grimsby space rock has been found.

A fragment of meteorite the size of a golf ball smashed in the
windshield of a Grimsby family's sport utility vehicle on Sept. 25,
according to a media release from the University of Western Ontario.

Astronomers released a video Oct. 7 of a blinding meteor streaking
across the skies of Southern Ontario three weeks ago, estimating pieces
may have landed in Grimsby or West Lincoln.

Meteorite hunters have been scouring the area ever since.

A press conference to discuss the find is scheduled for Friday morning.
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Received on Thu 15 Oct 2009 04:04:09 PM PDT