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Fireball Spectrum
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Bill W



登録日: 2012.02.13
記事: 153
所在地: Glasgow

記事日時: Thu Dec 27, 2018 4:31 am    記事の件名: 引用付きで返信

[quote=]

Hi Bill,
The Geminid spectrum is interesting. The Na/Mg ratio of Geminid spectrum has often discussed in this Japanese forum, too. I think the distribution of the ratio is wide every year. I hope to analyze the statistical distribution of that ratio. I could not capture a fireball spectrum in this year, but I have obtained a lot of normal magnitude (-2 to 2 mag.) Geminid spectra.

Clear Skies,

Koji[/quote]

The weather with me wasn't great for most of the Geminids this year but I did get a short window that gave me two spectra. I remembered your post from 2017.

Here is a multi year, multi plot (Possibly the first in the world of meteor astronomy!) of the Geminids from the past few years.

The brightest, by far, is the green plot which I captured during an observing trip to Tenerife last year. This one has the lowest ratio whereas a fainter one from this year (the yellow plot) has a much greater ratio. It would be interesting to hear if your results have the same general form.

That is, the brighter magnitude, the lower Mg/Na ratio? That would be a very interesting result from amateurs.

Best regards,
Bill.



geminid multi year.jpg
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geminid multi year.jpg


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前田



登録日: 2004.09.01
記事: 1840
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Thu Dec 27, 2018 9:33 pm    記事の件名: 引用付きで返信

Dear Bill,

The new camera chip is 1 / 2.8 inches in size with SONY IX 290. The sensitivity is high due to the back illumination type. But, the sensitivity is lower than the SONY a7s camera because the chip size is small. I would like to test another camera, but I am waiting for the lens to arrive now.

I am honored to remember my writing message. And thank you for the interesting latest results.
I had not pay my attention to the annual change of the Geminids spectrum, so I do not know the difference by year. However, since the spectrum of the Geminids has been taken every year since 2014, we may know something in the future.

I also introduce my recent analysis results of Geminids. However, since this result is a preliminary value, it will change in the future. I plotted a triangular composition diagram of only Geminids during a few years. As you expected, meteors with a higher ratio of Na are brighter meteors. Faint meteors are in the vicinity of the left side. You can guess various things from this diagram.
I am also looking forward to analyzing even more meteor spectrum.

Best regards,
Koji



GEM組成比20180906s.png
 説明:
I am sorry that some Japanese are in the figure.
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GEM組成比20180906s.png




最終編集者 前田 [ Fri Dec 28, 2018 10:55 am ], 編集回数 1 回
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Bill W



登録日: 2012.02.13
記事: 153
所在地: Glasgow

記事日時: Fri Dec 28, 2018 12:24 am    記事の件名: 引用付きで返信

Hi,

Thanks for the information. That is a great result. It illustrates perfectly what amateur meteor astronomers can now achieve!

Have you seen the live tracking of meteors by the astronomers at the University of Ontario. It is amazing. Some of the unusual effects, such as the "dissolving" and fragmenting meteors I have been catching with my watec and 25mm lens systems, are clearly seen in their videos.

I don't have the skills to build that kind of device on my own but I have an idea to "slow down" the meteors with a rotating mirror system.

If you ever find a Cosmicar/Pentax 12.5mm f1.4 manual lens (designed for 1 inch sensors) for sale in Japan, please let me know! That's that last item I need. Good ones seem to be rare. I have searched ebay and other on line dealers with little success. I did get one and it proved my design but it was optically poor.

Keep up the good work.

All the best for a cloud free and happy new year.

Regards,
Bill.
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前田



登録日: 2004.09.01
記事: 1840
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Fri Dec 28, 2018 11:49 am    記事の件名: short reply 引用付きで返信

Hi Bill,

I have a little time today, I will have a holiday from this afternoon.

The lens is sold in stores in Japan.
http://www.uniel-denshi.co.jp/CCTV-LENSES/PENTAX/B1214D-2.html

I have not seen the video of Ontario University,
Is this a video like this one?

https://youtu.be/797PskigufU

In Japan, there are only him who can take such movies.

Have a happy new year,

Koji
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Bill W



登録日: 2012.02.13
記事: 153
所在地: Glasgow

記事日時: Tue Feb 12, 2019 3:11 am    記事の件名: 引用付きで返信

Hi,
I've been testing out a ZWO174MM camera. With the latest drivers I could get the camera to run with UFO HD but there is an issue with the frame rate. With the USB3 interface there were lots of dropped frames when running at the maximum speed.

Trying USB2 improved the situation but with a much slower frame rate. With an exposure of 50ms and UFO HD capture set to 25fps it seemed happy with the camera input at a stated value of 17.1 fps.

I'm not sure how this all works into the timing accuracy but at least it produces spectra!!! Very Happy

This is my first HD spectrum. The image has been stretched and cropped but it shows the spectrum quite well. Even with a relatively poor angle of dispersion the ionised calcium lines in the UV can be seen to just split! This was caught using cheap plastic grating film!



M20190211_001129_HD crop.jpg
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M20190211_001129_HD crop.jpg


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ts007



登録日: 2004.08.09
記事: 3130
所在地: 埼玉県

記事日時: Tue Feb 12, 2019 4:55 pm    記事の件名: triangular composition diagram of Geminids 2018 etc 引用付きで返信

My name is Takashi Sekiguchi。I plotted a triangular composition diagram of Geminids during 2018-12-12/13-15/16。and during 2018-10-12-12-31 all meteor spectra 
system is SONYα7s 50mm F1.4(28mm) Transmission Diffraction Film Grating 500gpm UFOCaptureV2 HDMI convert 720×480。spectra analyzer RSpec v1.9



201812gemnamgfesekiguti_136.gif
 説明:
Geminids
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201812gemnamgfesekiguti_136.gif



201810-12allnamgfesekiguti_187.gif
 説明:
all meteor
 ファイルサイズ:  101.93 KB
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201810-12allnamgfesekiguti_187.gif



201810-12a7s.png
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type photo
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201810-12a7s.png



M20190212_051221_Saitama1_W6P.jpg
 説明:
20190212 051221 spo WatecNeptune100+CBCレンズ6mm Grating 600gpm
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M20190212_051221_Saitama1_W6P.jpg




最終編集者 ts007 [ Wed Feb 13, 2019 10:52 pm ], 編集回数 1 回
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前田



登録日: 2004.09.01
記事: 1840
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Tue Feb 12, 2019 8:53 pm    記事の件名: 引用付きで返信

Hi Bill,

Thank you for your new image and introduction of your new camera.
I think also that this HD spectrum has a good fine structure. The camera is famous, but it is said to have machine dependency. I think that you are lucky when you have found a condition that the camera works well.

I have recently tested a new HD spectral camera, ImagingSource DMK33GX290ecs.
This camera has a good performance. This camera will be another option.

By the way, Mr. Sekiguchi is my friend of spectral observation.
He observed many spectra everyday with many cameras. The advantage of his observation is that almost meteors have calculated the orbit by SonotaCo network.

Best regards,
Koji



M20190202_015205_JPMZ1_HHP_50p.jpg
 説明:
DMK33GX290ecs + 4mmF1.2 with 600 grooves/mm grating , 30FPS

50% reduced image
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M20190202_015205_JPMZ1_HHP_50p.jpg


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Bill W



登録日: 2012.02.13
記事: 153
所在地: Glasgow

記事日時: Wed Feb 13, 2019 5:59 am    記事の件名: 引用付きで返信

Hi,

The mineralogical results look great.

Yes, the camera seems to have several operational quirks but I will make more observations and monitor how it behaves.

I have several friends I work with also to determine the orbits. The results are amazing.

Regards,
Bill.
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ts007



登録日: 2004.08.09
記事: 3130
所在地: 埼玉県

記事日時: Wed Apr 17, 2019 11:05 pm    記事の件名: resout Gemind orbit parametor and Na/Mg etc 引用付きで返信

Hi Bill,
my meteors have calculated the orbit by SonotaCo network.
resout Gemind orbit parametor and Na/Mg etc
Geminids during 2018-12-12/13-15/16。system is SONYα7s 50mm F1.4(28mm) Transmission Diffraction Film Grating 500gpm UFOCaptureV2 HDMI convert 720×480。spectra analyzer RSpec v1.9



Tj-i NaMg-i NaMg-Solグラフgem.png
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Tj-i NaMg-i NaMg-Solグラフgem
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Tj-i NaMg-i NaMg-Solグラフgem.png



NaMg-q q-Qグラフgem.png
 説明:
NaMg-q q-Qグラフgem
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NaMg-q q-Qグラフgem.png



2018gem_orbittypeN0-N3.gif
 説明:
Gem_orbit
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2018gem_orbittypeN0-N3.gif


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Skymagic



登録日: 2016.07.26
記事: 16

記事日時: Sun Aug 11, 2019 1:17 pm    記事の件名: Meteor spectroscopy user manual? 引用付きで返信

Hi all!

Finally I assembled two spectrographs based on the WAT-910HX with a ThorLabs grating of 830 gr/mm. I plan to install equipment and begin observations this fall. Until spectrographs were installed, I decided to study the theory and methodology of processing the spectra. And I regretfully found out that processing meteor spectra is a rather difficult task involving many stages.

I tried to find as much information as possible on this subject, but all of it turned out to be quite fragmented and, perhaps, somewhat outdated, since several years have passed since its publication. Therefore, I am writing here with a question to experienced observers: is there currently a detailed user guide for meteor spectroscopy, including all the necessary steps and suitable for beginners? If so, I would be incredibly grateful for such a guide.

The greatest difficulties are caused by the orthographic transformation of the spectrum. I read articles about this, saw equations, but never met concrete steps, as a result of which distortion disappears and the spectrum becomes flat. It is possible that I just could not find it, for which I apologize sincerely in advance. I seem to be confused ... Confused

Thanks a lot!
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Bill W



登録日: 2012.02.13
記事: 153
所在地: Glasgow

記事日時: Tue Aug 13, 2019 1:05 pm    記事の件名: 引用付きで返信

HI all,

The Perseids have given me another great result...!

Although it's only a partial spectrum it is of the near UV/deep blue where many of the metals have very strong emissions.

This is by far THE highest resolution spectrum I have ever captured of a Perseid meteor (or any other for that matter! ; - ) )
The dispersion is only a few Angstroms/pixel. This yields an R of at least 1000(+).
The two brightest lines are the ionised lines of Calcium, the rest are to be determined!

A close inspection of the terminal flare shows it has many lines, wow!

Analysis to follow once I've had some sleep!

cheers,
Bill.
Shocked Very Happy



M20190813_014112_UKKilwinning_17P_crop.jpg
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Martin Dubs



登録日: 2014.03.04
記事: 47

記事日時: Tue Aug 13, 2019 4:25 pm    記事の件名: 引用付きで返信

Hi all,

I recently captured a nice perseid spectrum as well. I recorded it during a spectroscopy workshop in France. It is described here: https://meteorspectroscopy.org/2019/08/04/perseid-meteor-spectrum-at-ohp/
There you can find more details about the analysis with a Python pipeline. Unfortunately the weather has been bad during the peak of the Perseid shower, so there have been no more spectra.

Regards, Martin



S20190804_022600_OHP_1.png
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first order spectrum
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S20190804_022600_OHP_1.png



M20190804_022600_OHP_1P.jpg
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M20190804_022600_OHP_1P.jpg


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Bill W



登録日: 2012.02.13
記事: 153
所在地: Glasgow

記事日時: Wed Aug 14, 2019 12:03 am    記事の件名: 引用付きで返信

Hi,

I'm very impressed with the plastic film grating! It's "efficiency" is not high but the results speak for themselves!

Here are a couple of graphs extracted from the image.

The first is taken from the third "chop" back from the flare.

The second is across the terminal flare. The Ca+ lines are saturated out here. I count 35 definite lines, maybe there are a few more close to the noise floor... I can positively identify 31 of them. (Fe, Mg, Ca+, Ca, Mn, Si+,Cr, and Mg+).The other are probably Fe or maybe Ni. Need to consult an expert on that....



Cheers,
Bill. Shocked Very Happy



s20190813_014112_hires_a.png
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s20190813_014112_hires_a.png



s20190813_014112_hires_b.png
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s20190813_014112_hires_b.png


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Bill W



登録日: 2012.02.13
記事: 153
所在地: Glasgow

記事日時: Sun Aug 18, 2019 3:05 am    記事の件名: 引用付きで返信

Hi All,

Reworked one of the sections to investigate the pair of lines that runs very close to the bottom of the image.

Turns out that this "pair" is actually the partially resolved mg triplet around 5175A!
Here's an extended graph showing all the lines with a few major ones listed for context.
My system had just enough resolution to separate the 5183.6A line from the 5172.7 and 5167.3A lines (which are blended together).

The lines are just over 1nm apart in wavelength, only 2 pixels in the image!

Slowly getting to the meteors heart!

Cheers,
Bill. Shocked Very Happy



Hi Res Spec 20190813_014112 annot.jpg
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Hi Res Spec 20190813_014112 annot.jpg


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Bill W



登録日: 2012.02.13
記事: 153
所在地: Glasgow

記事日時: Thu Aug 22, 2019 4:54 pm    記事の件名: 引用付きで返信

Hi,

With a bit of re-orientation, here's how the new hi res spectrum fits into the overall wavelength span on an older low res spectrum.

Cheers,
Bill. Shocked Very Happy



Hires_Lores_perseid.jpg
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