(meteorobs) RE:Super-Meteor' Lights up Finland's Northern Sky

[stange34 at sbcglobal.net]

Seems like we are getting a lot of really big stuff from Southerly 
directions in the last month or so.

YCSentinel



----- Original Message ----- 
From: "Esko Lyytinen" <esko.lyytinen at jippii.fi>
To: <meteorobs at meteorobs.org>
Sent: 2007/09/30 09:59
Subject: (meteorobs) RE:Super-Meteor' Lights up Finland's Northern Sky



Hi,

I give you here some more details about this.

This happened sept. 28 at about 18.39.10 UT .
We have received about 300 visual reports of this, and more is arriving
all the time. Unfortunetely all fireball cameras to that direction were
clouded. There were however cameras even under clear skies to other
directions.
The fireball had an about 0.3 s flash with the very brightest only
during one video frame or possibly only one half frame.
Look at the Jarmo Moilanen's videos at:
http://www.avaruus.fi/
At the brigtest, the images are practiclly fully saturated. This also
happened to one less sensitive Philips toucam web camera looking about
opposite direction from the fireball..
The flash happened at quite a big height, maybe around 40 kilometrs or
even more.
It however was not a fast fireball. Because the duration in visual
reportings is commonly assumed to be about 5 seconds and the entry was
quit steep (maybe about 60 degrees) , the velocity probably was well
less than 20 k/s .It arrived from about SWW and

We have some level estimation (from sky brightening a little more
distant) of the absolute brightness of then flash of about -17 for a few
vide frames and at the very brightest flash maybe even two magnitudes
brighter than thhis?. This would mean the maximum visual brightness,
seen  from below, at about or possibly brihter than -20.

We have received a number of (up to about 6 minutes) delayed supersonic
boom (or explosion) observations.

We try to get the entry path modeled as well as possibly, but we do not
have any especially good directions available, and most of the received
"observations" are only a bright flash seen.

More updates is expected at the http://www.avaruus.fi/  site.

Esko

 >Date: Sat, 29 Sep 2007 22:16:17 +0100
 >From: David Entwistle <david.entwistle at dsl.pipex.com>
 >Subject: (meteorobs) 'Super-Meteor' Lights up Finland's Northern Sky
 >To: Global Meteor Observing Forum <meteorobs at meteorobs.org>
 >Message-ID: <kPmXNoBhCs$GFwfW at dsl.pipex.com>
 >Content-Type: text/plain;charset=iso-8859-1;format=flowed
 >
 >This extract is taken from the following page...
 >
 >http://www.yle.fi/news/left/id71032.html
 >
 >Finland's biggest astronomical association, Ursa, says that a light
phenomenon seen over much of northern and eastern Finland on Friday
night was a meteor -- the brightest seen in >the country in more than 30
years.
 >
 >The editor of the organization's journal, Marko Pekkola, says it was a
superbolide, a fireball more than 100 times brighter than a full moon.
 >
 >The fireball was apparently caused by a space rock striking the
atmosphere over Northern Ostrobothnia and then exploding over Finland.
Ursa says the rock may have weighed >some 200 kilogrammes. However it
was not clear on Saturday whether any meteorites fell to the ground.
 >
 >The dazzling 'shooting star' spurred worried telephone calls to
emergency centres in various parts of Finnish Lapland, as far apart as
Kemi, Enontekiö and Ivalo.
 >
 >Possibly more here...
 >
 >http://www.avaruus.fi/

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