Hi Chris
That was bad news. I hoped for a small rock out there. I calculated 3
km, but then I used 15 km as terminal height.
Regards
Lasse
Chris Peterson skrev:
Ah. So you're saying that you observed a stationary meteor, that
didn't appear to move across the sky at all? If so, that's the one
special case where you can accurately estimate the fall angle from a
single viewpoint. If the meteor's apparent altitude was +76°, then
that is indeed the fall angle (which is too steep to make this a
promising candidate for meteorite production).
Being so high in the sky also lets you narrow down both the distance
and the speed. The long duration suggests a slow speed, and a final
height of 30km would be a reasonable estimate. So that would place the
end of the meteor around 7km away from you, on the azimuth of the
event. If something survived, however, it would have continued to fall
at a low speed for several minutes, subject to the effects of the
wind. Any meteorites that landed could have been in any direction from
the retardation point, including behind it (that is, farther away from
you). If you have good wind information, you can make some rough
estimates.
My own intuition is that the combination of steep descent angle and
lack of terminal explosion suggests that the meteoroid simply ablated
away, and probably didn't produce any meteorites.
Chris
*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
----- Original Message ----- From: "Lasse Lindh" <[EMAIL PROTECTED]>
To: <meteorite-list@meteoritecentral.com>
Sent: Sunday, March 30, 2008 8:34 AM
Subject: Re: [meteorite-list] Rock on the ground or not?
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