[meteorite-list] Updated Lorton trajectory

From: Richard Kowalski <*damoclid_at_meteoritecentral.com*> Date: Wed, 27 Jan 2010 21:39:29 -0800 (PST) Message-ID: <409322.96520.qm_at_web113607.mail.gq1.yahoo.com> · damoclid_at_meteoritecentral.com

--
Richard Kowalski
http://fullmoonphotography.net
IMCA #1081
--- On Wed, 1/27/10, Shawn Alan <photophlow at yahoo.com> wrote:
> From: Shawn Alan <photophlow at yahoo.com>
> Subject: [meteorite-list]  Updated Lorton trajectory
> To: meteorite-list at meteoritecentral.com
> Date: Wednesday, January 27, 2010, 10:25 PM
> Rob and Listers,
> 
> When I put these coordinates in from the new estimated
> impact predictions for the Lortan?meteorite?in google
> maps, the new impact sites are in?Antarctica. Am I doing
> something wrong or is there a number off in the coordinates
> that's giving me a wrong location?
> 
> Shawn Alan
> 
> Mass Longitude Latitude Distance Bearing 
> ----- --------- -------- -------- ------- 
> 3 g -77.1383 38.7130 4.05 77.9 
> 10 g -77.1635 38.7104 2.68 75.5 
> 30 g -77.1804 38.7077 1.75 74.0 
> 100 g -77.1976 38.7043 0.80 71.8 
> 300 g -77.2116 38.7007 -0- N/A 
> 1 kg -77.2282 38.6965 0.94 252.1 
> 3 kg -77.2415 38.6923 1.72 250.2 
> 10 kg -77.2560 38.6874 2.57 249.0 
> 
> 
> 
> 
> [meteorite-list] Updated Lorton trajectoryRob Matson
> mojave_meteorites at cox.net 
> Wed Jan 27 04:13:46 EST 2010 
> 
> 
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> 
> Hi All, 
> 
> I finally received a good second image of the Lorton bolide
> smoke 
> trail taken immediately after the fall (and before upper
> atmospheric 
> winds distorted it). More importantly, the two images I
> have were 
> taken from sufficiently different vantage points that a
> good 3D 
> solution could be computed. (My early, somewhat hurried
> "first-cut" 
> at the trajectory was based on only a single image, and a
> cobbling 
> together of 50+ witness reports.) That first solution
> wasn't bad 
> as far as the flight direction (NNE -> SSW); however, as
> steep as 
> I made the entry angle, I didn't make it steep enough. 
> 
> The Lorton meteoroid entered at a surprisingly steep angle
> -- about 
> 15 degrees from vertical! If upper atmospheric winds had
> been 
> light, this would have made for a very tight strewnfield.
> But 
> those winds were anything but light at the time of the
> fall. For 
> instance, at 11-km altitude, the jet stream was over 90
> knots! 
> Even down at 5-km altitude, the wind was over 40 knots. 
> 
> So here are my new impact predictions as a function of
> mass. 
> The distance and bearing columns are in miles and degrees,
> 
> respectively, relative to the impact coordinates of the
> 308-gram 
> mass: 
> 
> Mass Longitude Latitude Distance Bearing 
> ----- --------- -------- -------- ------- 
> 3 g -77.1383 38.7130 4.05 77.9 
> 10 g -77.1635 38.7104 2.68 75.5 
> 30 g -77.1804 38.7077 1.75 74.0 
> 100 g -77.1976 38.7043 0.80 71.8 
> 300 g -77.2116 38.7007 -0- N/A 
> 1 kg -77.2282 38.6965 0.94 252.1 
> 3 kg -77.2415 38.6923 1.72 250.2 
> 10 kg -77.2560 38.6874 2.57 249.0 
> 
> As before, these coordinates (when you connect the dots)
> trace 
> out a curve of the estimated strewn field centerline.
> Unfortunately, 
> the lightest (and presumably more numerous) fragments would
> have 
> been windblown onto Ft. Belvoir. But there is still some
> room ENE 
> of the doctor's office that is not on military land, and
> plenty 
> of real estate in the "heavy direction" (WSW) if you're
> feeling 
> lucky. --Rob 
> 
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