(meteorobs) meteorobs Digest, Vol 14, Issue 1

[Esko Lyytinen]

Hi,

In my opinion this quite clearly was a normal natural meteor-fireball, 
in spite of the original orbit near that of the Earth.
In any case, this was not a re-entering Earth-satellite.

My statistical model (not published, data from published old Canada 
fireball-camera-network) would give (from the slope (about 25 degrees) 
and end height and Vinf velocity) an estimation to the end mass (of 
assumed normal chondite density meteorite), to be around one or two kg:s.
The dark flight from the end would then be about 25 kilometers 
(projection on the ground), so this quite probably have reached the hard 
ground (not to water).
In addition to other uncertainties, the winds in the free fall may 
affect the location up to some kilometers.)

One recent expected meteorite fall that I studied, had the original 
orbit even more close to that of the Earth. But Vgeo velocities around 
or less than the derived 6 km/s (corresponding Vinf less than 13 km/s) 
are not common, in my experience. Vinf around or above 13.5 km/s are 
getting somewhat more common.

Esko


> Date: Mon, 01 Nov 2010 14:13:27 +0100
> From: Nico Montigiani<montigiani at tin.it>
> Subject: (meteorobs) Very slow meteor 2010 Oct 29 01:52:07 UT from
> 	Italy
> To: Global Meteor Observing Forum<meteorobs at meteorobs.org>
> Message-ID:<4CCEBCF7.8040004 at tin.it>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi,
> Have you some idea about this very slow meteor registered by Italian
> Meteor and TLE Network (I.M.T.N.) Ferrara and Pontedera (PI) stations?
> The geocentric velocity was about 6 km/sec and the orbit is similar to
> the Earth orbit.
> May be a satellite re-entering in atmosphere?
> Any suggestions?
>
> View the video and analysis here:
> http://meteore.forumattivo.com/bolidi-e-superbolidi-riprese-video-f30/fireball-20101029_01527-1-ut-t1403.htm
>
> Thank you
> Nico Montigiani
>
>
>