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Bright fireball at 22nd Dec 2017 (Finland)

 
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tkuhmone



登録日: 2014.08.26
記事: 56

記事日時: Sat Dec 30, 2017 12:54 am    記事の件名: Bright fireball at 22nd Dec 2017 (Finland) 引用付きで返信

Here is one of Watec 910 captures, that I consider the few best of the year. This fireball at central Finland, was visible through a cloud layer for my own station. Sonic booms were heard in the near region, after some delay.

There is some bright flashes seen at end of fireball visible flight. During that time, maybe some particles were disintegrated from main meteor body.
Some small meteorite fragments were estimated to fall, but very difficult to search those because of snow on the ground and additional snowfall after visible fireball flight Sad
https://youtu.be/663M28lDV0E



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記事日時: Sat Dec 30, 2017 8:13 am    記事の件名: Re: Bright fireball at 22nd Dec 2017 (Finland) 引用付きで返信

tkuhmone wrote:
Sonic booms were heard in the near region, after some delay


Wow... thank you for the news!
I have never heard of those. Sad

Here, we had only one meteor in 14 years, that was recorded by sonic boom sensor and seismic network in Japan.
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tkuhmone



登録日: 2014.08.26
記事: 56

記事日時: Sat Dec 30, 2017 8:27 am    記事の件名: 引用付きで返信

here is analysis what was soon published by URSA. It is in finnish, maybe google could translate...
https://www.avaruus.fi/uutiset/tahtiharrastus-ja-taivaanilmiot/terveisia-avaruudesta-pihtiputaalle-ja-kinnulaan-perjantai-illan-tulipallon-mallinnus-valmistui.html

I did not hear any sound(s) of this case. Mainly because I was indoors, maybe TV or radio on. But if I have been out at same time - I am quite sure sounds have been able to hear.

Based on the links analysis, the initial mass of meteor (in atmospheric entry phase) was estimated to be few tens of kilograms. If correctly remember, inital speed was little bit over 20km/sec.

If there is some fragmets on the ground (based on analysis I believe it) they will be lost...

In the wintertime most ideal location to search possible dropped fragmets, would be lake ice without any snow cover...
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