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Fireball Spectrum
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Martin Dubs



登録日: 2014.03.04
記事: 56

記事日時: Wed Sep 02, 2020 4:46 am    記事の件名: 引用付きで返信

Dear all,

I have reported previously on my Python script for the analysis of meteor spectra. In the meantime I have refined it and published it on Github:
https://github.com/meteorspectroscopy.
I also published the script for the determination of the parameters of the orthographic projection at the same place. For an short description, see:
https://meteorspectroscopy.org/2020/08/26/meteor-spectroscopy-python-scripts-on-github/
I f you are interested, give it a try. Comments are welcome.

Here the result of a late perseid:

Martin



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M20200827_021543_MAI_2P.jpg


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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Sat Oct 03, 2020 6:13 am    記事の件名: 引用付きで返信

Hi Koji,

Sorry I missed you at the virtual IMC!

I have been getting some very interesting results recently, in fact just a few minutes ago I captured another high resolution spectrum!

This is one I caught last night with a watec 910 and 830 grooves/mm grating.

Nicely dispersed with both 1st and 2nd order captured. The coloured synthetic spectrum is taken from the second order.

cheers,
Bill Shocked Very Happy



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前田



登録日: 2004.09.01
記事: 2754
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Sat Oct 03, 2020 1:56 pm    記事の件名: 引用付きで返信

Hi Bill,

This IMC was online so I was able to participate.
It was a little disappointing that there were few presentations about the spectrum at this IMC.
However, I enjoyed the whole presentation with a lot of variety. It was difficult to hear.

This spectrum has a great resolution.
When a meteor explodes, you can get a great spectrum

Thank you,
Koji
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前田



登録日: 2004.09.01
記事: 2754
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Sun Dec 06, 2020 7:14 pm    記事の件名: fireball on 2020 Dec. 06 at 00h55m19s (JST) 引用付きで返信

Hello everyone,

The end part of the fireball belongs to S Taurids shower crossed the spectrum camera yesterday.
I was also able to take spectrum of the split pieces. It seems that the bright lines are saturated. It is hard to analyze.
According to the UFO analyzer, the mag. of the original fireball is -4 mag.

It will be Geminids soon. I'm looking forward to it.

cheers,
Koji MAEDA

modified at am.0 on Dec.7th.



M20201206_005521_JPMZ1_HEP1200pix.jpg
 説明:
SONY alpha7s 50mmF1.4 with 600grooves./mm grating, 4K 30p

observed at Miyazaki, Japan
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M20201206_005521_JPMZ1_HEP1200pix.jpg



M20201206_005521_JPMZ1_HEPss.mp4
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video

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M20201206_005519_JPMZ1_HZss.mp4
 説明:
by all sky camera

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 ファイル名:  M20201206_005519_JPMZ1_HZss.mp4
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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Fri Dec 11, 2020 8:22 am    記事の件名: 引用付きで返信

Hi Koji,

I have viewed the video many times, it is an extraordinary spectrum. Many, many iron lines!
Wonderful!

The weather forecast for me is very poor for the peak of the Geminids but I always hope the forecast will be wrong!

Cheers,
Bill. Very Happy
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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Wed Dec 23, 2020 7:49 am    記事の件名: 引用付きで返信

Hi,
The weather gave me a break in the clouds and I was able to catch a nice spectrum this morning.

My friends in the NEMETODE network have confirmed it was an Ursid. This is first time I've seen an Ursid spectrum!

The image is the unprocessed image. It looks typically rocky in nature.

I'll post the processed spectrum shortly.

Best regards
Bill.

PS Merry Christmas and a safe and prosperous new year to everyone!



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最終編集者 Bill W [ Wed Jan 06, 2021 3:52 am ], 編集回数 2 回
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前田



登録日: 2004.09.01
記事: 2754
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Wed Dec 30, 2020 10:43 am    記事の件名: iron meteoroids 引用付きで返信

Hi,

Today I am not talking about the spectrum of fireballs.

In December, the number of iron meteoroids is increasing. In December and January every year, the ratio of iron meteoroids is less than 10% of the total spectrum.
All iron meteoroids have very similar spectral shapes and are characterized by darkness.


Koji

Happy New Year.
May the Quadrantids clear up at everyone.



202012irons.jpg
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SONY alpha7s + 50mmF1.4 with 600grv. grating, 4K 30p
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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Wed Jan 06, 2021 3:50 am    記事の件名: 引用付きで返信

Hi,
A happy new year to all the readers and users of the forum.

Yes, that is really interesting. I noticed I'd captured a few Fe meteors also! Have you noticed this increase before?

On the 1st January a very bright fireball was seen over northern England.

IMO/AMS Event 10-2021

It was very low and distant from my location in SW Scotland so it must have been VERY bright as it generated a 3rd order spectrum on one of my HD cameras. VisualSpec measured the dispersion at 0.13nm/pix. This is the highest I have ever captured!

For the first time I could cleanly split the Na doublet.

The composition looks quite unusual with there being no Mg seen. The lines present are from Fe, Na and Cr.

I've attached a colourised synthetic version.

cheers,
Bill.



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前田



登録日: 2004.09.01
記事: 2754
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Sun Jan 10, 2021 3:56 pm    記事の件名: 引用付きで返信

Hi Bill,

Thank you for the replay.
It has been known for about five years that the ratio of iron meteoroids increase
in winter. see the attached figure. This figure will be updated soon.

The spectrum of the 10-2021 fireball is very good resolution!
And it is rare type of spectrum, I think too. According to my statistics in 2016, it was only about 2% of the total meteors from which the spectrum was obtained.

Best regards,
Koji



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Fe_spo.png


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ts007



登録日: 2004.08.09
記事: 5054
所在地: 埼玉県川越市

記事日時: Fri Jan 22, 2021 4:47 pm    記事の件名: The spectrum 引用付きで返信

Hi everyone

The spectrum of a long-path low-speed -10mag meteor at 20:32:38 on January 20 was captured. It's too bright and saturated.It is the trimming of the secondary spectrum.
It is an iron meteor.The two bright lines on the far right are ghosts.

Takashi Sekiguchi



M20210120_203240_jpSaitama1_a7Pmms.png
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SONY α7s + Nikon 50mmF1.4 + 500 gratings (transmission type diffraction grating film)triming
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M20210120_203240_jpSaitama1_a7Pmms.png



M20210120_203240_jpSaitama1_a7Pm.jpg
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The original image
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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Thu Mar 04, 2021 6:23 am    記事の件名: 引用付きで返信

Hi Takashi,

That's a fantastic colour spectrum.

With the COVID pandemic I have been very busy with work and have not been doing much observing.

Sad

I did get a few nice spectra from the Quadrantids back in January.

Stay safe



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SonotaCo
Site Admin


登録日: 2004.08.07
記事: 12653
所在地: 139.67E 35.65N

記事日時: Thu Apr 29, 2021 9:57 am    記事の件名: 引用付きで返信

Martin Dubs wrote:


Sonotaco,
I have a problem replying in the forum. Some normal text is not accepted, with error 403, forbidden Sad , so I had to remove part of the answer. What is the cause?



At last, it seems this problem has been solved.
Today, I stopped the anti spam ckecking service which is installed to the new server .
It seems it is too severe for English posts.
Sorry for taking long time to solve. Please try again.
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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Fri Aug 20, 2021 11:22 pm    記事の件名: 引用付きで返信

Hello Everybody,

Another year another Perseid shower. Looks like we were treated to an enhanced display this year with more bright meteors/fireballs than usual and a large unexpected outburst on the 14th.

However this year I captured virtually no Perseid spectra at all. The best results were all sporadic fireballs!

This is the best one and was very well placed in the FOV by good luck!

I'll be presenting some of my HD results at this years online IMC, hopefully meet you there.

Cheers,
Bill.



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前田



登録日: 2004.09.01
記事: 2754
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Mon Aug 23, 2021 11:15 pm    記事の件名: 引用付きで返信

Dear Bill,

Thank you for the high resolution spectrum. It is beautiful. What is the gamma of this camera?

It rained almost during the Perseid period and a few spectrum could be taken at all, here Miyazaki Japan.
Instead, this year's kappa Cygnids is so active enough to have the spectrum.

I will attend the IMC as well, though I will not have a presentation.

regards,

Koji



M20210810_042457_JPMZ1_HSPtrim50p.jpg
 説明:
the best shot of Perseid spectrum in this year

a7s + 35mm with 600 groovs grating, 4K 30p

PER Mag. -2
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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Wed Aug 25, 2021 8:03 am    記事の件名: 引用付きで返信

Hi Koji,

That is a beautiful coloured spectrum.

According to the camera settings, I have the gamma set to a level of 50 out of a scale of 100. However I'm not really sure what the genuine photographic equivalent gamma is.

From the 9th Aug to 14th August I captured several hundred Perseids on my camera systems. It seems this year that I was simply unlucky with catching Perseid spectra. I caught a few but they were either poorly dispersed or only a partial spectrum.

The bright sporadics were much more interesting!

The one on 20210812_022909 (green plot) had the strongest Ca and Mg lines I have ever seen. The two ionised Ca lines at 393nm and 397nm were incredibly prominent in the original video, leaving a brief trail unfortunately some of the resolution has been lost in the processing of the spectrum so the lines only look partially resolved in this graph.
I might put these onto YouTube.

I'm really looking forward to meeting up with you at the IMC.

Regards,
Bill.



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