Howdy all
Based largely on Bill Cooke's data, I've run a dark flight model to
generate an estimated strewn field for the DFW event. I was surprised at
the results, but after looking it over it appears correct given the very
flat trajectory and high velocity when dark flight began. I may be out
of contact for the next couple of days (no, not searching in Texas
unfortunately) so I'm putting this result out there so y'all can examine
it, discuss it, and hopefully compare it against dark flight model
results that others run.
http://radarmeteorites.wordpress.com/2012/02/03/tx-dfw-area-02-feb-2012-0157-utc/
Cheers,
Marc Fries
On 2/8/12 8:38 PM, Mike Hankey wrote:
Jake,
I agree its a bit further south.
Bill was kind enough to give me the AZ/EL values for all cameras.
These are plate solved using software so very solid and more accurate
than the ones I did manually.
I added the hawley camera and the austin camera and re-ran the program
using the updated values.
It generated 5 solutions using 5 different camera combos almost all
are identical and very close to Bill's solution. Its pretty
ridiculous, how close these all are.
So I think this is a winner folks. :)
I posted a picture of the 6 trajectories and also a link to the
trajectory KMZ file. See the update at the bottom of this page:
http://www.mikesastrophotos.com/comets/2012-02-01-texas-fireball-trajectory-solutions/
*When viewing the kmz trajectories, keep in mind Bill's red line is 2d
and ends at 40km altitude while the other trajectory models are 3d &
drawn toward their 0km geometric end point.
Thanks,
Mike Hankey
Freeland MD
On Wed, Feb 8, 2012 at 10:33 PM, Jake S <[email protected]
<mailto:[email protected]>> wrote:
I've made some revisions as well. With the altitude data from Bill
Cooke. Given that it was so shallow and still at 60 km when it passed
by the seismograph greatly alters what I had expected. I would have
expected the sonic boom to not generate such a large pressure wave
until in the more dense lower air. But anyways this high altitude
brings the trajectory farther south. Based on my calculations from the
seismograph, the trajectory Bill Cooke has provided is only about 3km
off which is easily within the uncertainty in my calculations
(especially if the speed of sound is slightly off, colder than a
standard day?)
http://3dradar.wordpress.com/2012/02/09/dfw-tx-222012-0157-utc/
-jake
On Wed, Feb 8, 2012 at 7:09 PM, Mike Hankey <[email protected]
<mailto:[email protected]>> wrote:
> Jake,
>
> Thanks for the input. I'm going to make some revisions to my
> information and also take into consideration the 2nd camera in
Hawley.
> Prior to Bill's post I was really confused about the cameras in
> coleman vs hawley. I didn't realize there were actually two cameras.
> I'm also going to work in the data from Pat on the austin camera. i
> also have some revised & new az/el values. I will report back
with v2.
>
> Thanks,
>
> Mike
>
> On Wed, Feb 8, 2012 at 8:55 PM, Jake S <[email protected]
<mailto:[email protected]>> wrote:
>> I drew up a rough map with the seismograph data on it (very rough
>> drawing, if you want the actual data I can probably send you
it). In
>> my previous post i had said the video trajectory was too far
north but
>> I think i must have drawn it off or something, because it
appears they
>> are very close. The video trajectory is actually slightly south.
>>
>> http://3dradar.wordpress.com/2012/02/09/dfw-tx-222012-0157-utc/
>>
>> I know all the eye witness's seem to show it over by Edgewood but i
>> think these two pieces (video and seismographs) show it further
north,
>> the one seismograph isn't the greatest of hits but if going off
that
>> as being accurate, I'd search up by Greenville, TX, otherwise
it could
>> rotate more East/West and be down near Edgewood also but i
think this
>> is the less likely scenario. Until they are found, we won't know...
>>
>> -Jake
>>
>>
>> On Wed, Feb 8, 2012 at 9:48 AM, Pat <[email protected]
<mailto:[email protected]>> wrote:
>>> Jake can you provide a line (or the coordinates for a line)
that represent the center of the seismograph data? I think between
that and the Austin video I can actually look on the ground.
>>>
>>> I currently have it following the dark green band in Mike's
map4 below, but displaced to the north so that it just clips the
north of the cedar creek reservoir. I think the seismograph data
could give us a directional line on the ground (and if I am
correct it should pass thru Ennis).
>>>
>>> --- In [email protected]
<mailto:[email protected]>, Jake S <jakeschaeferml@...> wrote:
>>>>
>>>> I have a few comments on your trajectory, particularly on
this image:
>>>>
http://www.mikesastrophotos.com/wp-content/uploads/2012/02/map4.jpg
>>>>
>>>> I think your red/maroon colored trajectory is too far north.
Based on
>>>> sonic boom arrival times to seismographs, the trajectory
looks like it
>>>> will be between the dark green and red lines on that map.
>>>>
>>>> >From the coordinates of : (31.99,-97.46), the meteor HAS to have
>>>> passed no more than 86 km distance at its closest point.
Factoring in
>>>> altitude it must travel will reduce this further 86 =
>>>> sqrt(altitude^2+ground distance^2). Factoring in a reasonable
mach
>>>> angle for the shockwave only slightly increases the distance.
With all
>>>> this in mind, i think your red trajectory is possibly up to
20 km too
>>>> far north, at least near the starting point of that line,
what that
>>>> shift will do to the endpoint i don't know. If i knew the
velocity and
>>>> altitudes of the trajectory this could be refined i think.
>>>>
>>>>
>>>> On Tue, Feb 7, 2012 at 7:52 PM, Mike Hankey <mike.hankey@...>
wrote:
>>>> > Thanks Pat. I would agree with a SE of Greenville location.
Are you
>>>> > saying these guys found meteorites from this fireball already?
>>>> >
>>>> > On Tue, Feb 7, 2012 at 10:29 PM, Pat <pat_branch@...> wrote:
>>>> >> Mike,
>>>> >> Here is a great meteor view which I have not seen until
now. It was shot in Austin from the Joe's Crab Shack at 600
Riverside Dr. The angles should be easy to calculate accurately
because the city skyline gives you some angle estimates. I posted
a picture of exactly where the video was shot from in the Files
section of this group.
>>>> >> The view was shot NNW between the two trees just off the
balcony.
>>>> >> http://www.youtube.com/watch?v=8juQ_ld_G7U
>>>> >>
>>>> >> I still think it was SE of Greenville, but I am sure there
were at least two large pieces that separated early. I have seen
pictures of a team from the Austin Planetarium which I believe
found some meteorites about 1 mile east of Edgewood TX at the
corner of County Roads 3601 and 3604.
>>>> >> Pat
>>>> >>
>>>> >> --- In [email protected]
<mailto:[email protected]>, Mike Hankey <mike.hankey@> wrote:
>>>> >>>
>>>> >>> Hello,
>>>> >>>
>>>> >>> I've been working on the trajectory for this fireball,
but i've been a
>>>> >>> little discombobulated due to the mystery over Kevin's
Hawley /
>>>> >>> Coleman camera location. A friend forward'd me what I
believe to be
>>>> >>> the best location for Kevins camera and we suspect it is
in coleman
>>>> >>> and not hawley.
>>>> >>>
>>>> >>> I am a lot happier with these solutions and want to share
now that I'm
>>>> >>> more confident.
>>>> >>>
>>>> >>> I want to stress this is still just a v1 cut at the
trajectories and
>>>> >>> the calculations are based on manual solving of the
allsky images,
>>>> >>> which is an imperfect art form. So, this is probably
wrong, but the
>>>> >>> best calculated guess with available information.
>>>> >>>
>>>> >>> I'm willing to share my values and KMZ with anyone who is
interested
>>>> >>> and I would actually like to compare notes with someone
to make sure I
>>>> >>> didn't make any major mis-calculations with regard to
lat/long/az/el
>>>> >>> values.
>>>> >>>
>>>> >>> I will continue to work on this folding in good witness data.
>>>> >>>
>>>> >>> Here are the maps:
>>>> >>>
>>>> >>>
http://www.mikesastrophotos.com/comets/2012-02-01-texas-fireball-trajectory-solutions/
>>>> >>>
>>>> >>> Thanks,
>>>> >>>
>>>> >>> Mike Hankey
>>>> >>> Freeland MD
>>>> >>> _______________________________________________
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>>>> >>> meteorobs@
>>>> >>> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>>>> >>>
>>>> >>
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