Hi Chris
Thanks for your answer. Well, this one pointed straight towards me.
While bright and when it got weaker it did not move at all. I could see
this because there were two stars just beside it. I am an amteur
astronomer, so observing is nothing new to me. It did not deviate during
the fall. I first thought it to be a GRB since it was so stationary, but
then I realized that that was out of the question, so the only thing
left was a meteorite. It showed no sign of break up. Checking the star
map, it held an angle of 76 degrees. It's brightness could be a lot
higher than -4. It's hard to tell.
Regards
Lasse
Chris Peterson skrev:
That's a difficult question to answer. The majority of meteorites come
from meteors that are not terribly bright. But mag -4, while
technically a fireball, isn't much of one, and is very common. It's
fair to say that a -4 meteor is a candidate for meteorite production,
but I don't know how to quantify that chance.
If the information you are providing is purely from your own
observation, there's not enough information to make any estimates.
From a single vantage point, the velocity and fall angle of the event
are impossible to determine. It may have been heading nearly towards
you, several hundred kilometers away, or it may have been dropping
straight down 50 km away. There's no way to tell. Finally, from a
single viewpoint you have no way of estimating where the actual fall
might be. Even with many witnesses and camera views, it's usually not
possible to narrow a fall zone to less than many square miles.
The meteors that are most likely to produce meteorites have some
common characteristics. They are slow, usually less than 20 km/s
(which is most likely in early evening meteors). Their entry angles
are shallow, which provides lots of time to slow down while high in
the atmosphere, before the air becomes so thick that a fast object can
ablate rapidly ablate away, or fragment into small pieces that burn up.
Chris
*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
----- Original Message ----- From: "Lasse Lindh" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, March 30, 2008 6:44 AM
Subject: [meteorite-list] Rock on the ground or not?
Hi all
If one sees a meteor fall with a brightness of -4 or brighter, it's
duration is +10 sec. What is the chances of finding a small rock
where it suppose to have landed? Is it big enough considering the
brightness and length of fall. It needs to be said that the angle of
the fall was around 75-80 degrees, allmost straight down.
Regards
Lasse
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