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Fireball Spectrum
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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Sun Apr 12, 2015 8:13 am    記事の件名: 引用付きで返信

Hi,
Thanks to the Nemetode group co-ordinator William Stewart, he ran the files from Analyser through UFO Orbit and produced the orbit map.

So now we know it's a stony ( iron ) of probable asteroidal origin!

A great result.

Very Happy

Cheers,
Bill.



B20150410_005837GMAP.jpg
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B20150410_005837GMAP.jpg



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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Fri Apr 17, 2015 7:13 am    記事の件名: 引用付きで返信

Hi All,

They just keep coming. Caught another ~ -3
This was an odd one. Not the usual Iron/nickel lines of a typical iron meteoroid also no sodium or magnesium.
This had very bright iron emission in some particular unresolved bands. Along with calcium and quite a clear Hydrogen line.

I've done a comparsion with the mutual capture one to show the differences.

IF and it's a big if!, some of the mineralisation source was geothite FeO(OH) it means it must have been exposed to water or something with water in it (water vapour?) at some point in its geological past . I have NO evidence whatsoever for this but maybe, just maybe this was a rusty little piece of Mars....

Fascinating.. Surprised

Cheers,
Bill.



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Spectrum Comparison.jpg


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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Fri Apr 24, 2015 9:06 pm    記事の件名: 引用付きで返信

Hi,

Got a well dispersed spectrum of a stony iron meteor yesterday.

Put a video on youtube

https://youtu.be/1pfwYQ_dM1E

cheers,
Bill.
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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: Sat Apr 25, 2015 7:14 am    記事の件名: 引用付きで返信

Nice video Surprised
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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Sun Apr 26, 2015 9:17 pm    記事の件名: 引用付きで返信

Hi,

Thank you, it's the UFO software that makes it possible!

Cheers,
Bill.
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APODman



登録日: 2011.01.08
記事: 34

記事日時: Tue Apr 28, 2015 10:20 pm    記事の件名: 引用付きで返信

Amazing spectra Bill !!
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APODman



登録日: 2011.01.08
記事: 34

記事日時: Tue Apr 28, 2015 10:57 pm    記事の件名: 引用付きで返信

My last was interesting capture was the spectrum of a Sprite, three lines are easily distinguishable, a fourth and fifth lines only after a contrast enhancement processing.

The two strong bands I think that´s the A and B bands of atmospheric oxygen, the previous line to them and the next two (already in the infrared) is that I have doubt.



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APODman



登録日: 2011.01.08
記事: 34

記事日時: Tue Apr 28, 2015 11:00 pm    記事の件名: 引用付きで返信

Spectrum analysis


2o orderb_3b.jpg
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2o orderb_3b.jpg


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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Wed Apr 29, 2015 3:52 am    記事の件名: 引用付きで返信

Hi APODman,

That is a tremdous result!, I've never seen a sprite.
There were some caught recently near me but the conditions for them here are very rare.

I've attached a meteor spectrum caught by one of the VLT scopes a few years back. You can see two broad bands of molecular nitrogen as well as an atmospheric molecular oxygen at the longer wavelength. These bands match your result really well.

So you might have both O2 and N2 there.

I don't know what the other ones are but they might be from other atomic O and N lines.

cheers,
Bill. Very Happy



eso reference meteor spectrum fors.jpg
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eso reference meteor spectrum fors.jpg


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Martin Dubs



登録日: 2014.03.04
記事: 56

記事日時: Sun Jun 28, 2015 1:56 am    記事の件名: 引用付きで返信

Hi Bill,

you are the expert on meteor spectra. I have recorded a nice fireball spectrum, unfortunately the zero order is missing. From a second camera without grating I know approximately where it should be. The dispersion I know quite precisely from other spectra with the same setup. In the following diagram the dispersion should be correct, but with a possibly large offset in wavelength. The spectrum does not seem to match anything I have seen before.
For comparison you may check with some earlier spectra from April with the same equipment ant processing pipeline:
http://www.meteorastronomie.ch/images/20150423_Lyriden%20Spektren.pdf
or this spectrum:

Do you (or anybody else) have any ideas what I see here? Na and Mg or O I do not seem to fit.

Thanks for comments,

Martin



M20150625_220937_MAI_2P.jpg
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peak image of spectrum
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M20150625_220937_MAI_2P.jpg



150625add28-1620.png
 説明:
meteor spectrum Watec 902H2 with 600L/mm grating, calibrated
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150625add28-1620.png



0423_2302add20_cal_comp ref.png
 説明:
Lyrid meteor spectrum from 20150423_2302 same calibration (red) compared to reference from http://members.shaw.ca/epmajden/
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0423_2302add20_cal_comp ref.png


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Martin Dubs



登録日: 2014.03.04
記事: 56

記事日時: Mon Jun 29, 2015 1:09 am    記事の件名: 引用付きで返信

Hi,

I looked once more at the spectrum and compared it with spectra in the literature (looking for "meteor" in Arxive is quite helpful). I think I found a correct calibration. Maybe my dispersion was not exactly what I have thought (Zoom lens!)
Here a comparison with a literature spectrum, aligned to the Na I line:
http://arxiv.org/ftp/arxiv/papers/1308/1308.0571.pdf
My spectrum is not corrected for spectral response.
Does this seem reasonable?

Martin



150625add28shift-1790 comp Madiedo.png
 説明:
comparison with Madiedo La Donana fireball (my spectrum red)
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150625add28shift-1790 comp Madiedo.png


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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Tue Jun 30, 2015 7:10 pm    記事の件名: 引用付きで返信

Hi,

That looks spot on now. I recorded an almost identical spectrum a short while ago.
I put a posting here about the video a few posts back but didn't include the compsosite.
So here it is....

This shows the power of video meteor spectroscopy. The observations show that both of these meteors are made of exactly the same material! That could never be done before!

We now have the very first sub category of sporadic meteors with two observations of the same type!

Although the number of spectra caught compared to normal video meteors is very low I hope that as more observers run a dedicated spectrum camera we will see distinct groups emerge. This will take a long time but I'm convinced of it.

There are definitely "family groups" of meteoroids!

It's an interesting paper but it shows clearly that amateur observations are every bit as good, if not better that professionals now. It always amazes me how analysis can be done with orginal spectra that are not as good as we can produce!

regards,
Bill Wink



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Bill W



登録日: 2012.02.13
記事: 182
所在地: Glasgow

記事日時: Wed Jul 22, 2015 9:56 pm    記事の件名: 引用付きで返信

Hi,
I can't believe its taken me so long to notice...!
However, I have just realised SonotaCo's fireball spectrum, in this thread at the start, is yet another of the same type as noted by myself and Martin.
a: very strong sodium emission, b: a weaker magnesium line and c: distinct groups of of iron emission lines.
So there are now three sporadics that are almost identical.
Surely that's got to indicate some sort of distinct grouping of meteorids!!!
cheers,
Bill.

Very Happy
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Martin Dubs



登録日: 2014.03.04
記事: 56

記事日時: Fri Jul 24, 2015 4:30 am    記事の件名: 引用付きで返信

Hi Bill,

interesting idea. Nice that you find some use for my spectra. In the meantime we have been busy in Switzerland. Our network is coming into good shape. Yesterday we observed the first fireball (-8mag) visually, photographically, by video, radio and spectroscopy simultaneously from different stations. The results you can find on our webpage:
http://www.meteorastronomie.ch/ergebnisse.html
The spectroscopy of this fireball is further down on this page, including video spectra. I extracted two spectra of the fireball, one from the beginning of the event (160ms, by registering and adding 8 video fields), the second from the stationary trail after the explosion (140 ms, by adding 7 fields). The middle part of the event was by far too intense, saturating the spectrum completely, useless for analysis.
It is interesting to note that the two spectra are quite different, the O I line missing in the afterglow spectrum, the intensity ratio between Mg and Na reversed in the two spectra etc.. All this is quite new to me. I am not sure about line identification in the 4000A region (Fe, Mg, Ca)
Notice also that I used my new method of spectrum linearisation before stacking. This makes the calibration very easy, just a check of linearity with a few lines. The method is described here:
http://www.meteorastronomie.ch/images/MeteorSpectroscopy_Aspekt2015_part2.pdf
(in english) More on this method to follow.

Regards, Martin



150722a8.jpg
 説明:
stacked spectrum of beginning of meteor
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150722a8.jpg



trailadd7.jpg
 説明:
added 7 fields of persistent trail after passage of meteor
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trailadd7.jpg



150722a8-trail.png
 説明:
spectra comparison corresponding to beginning and trail. Blue: beginning, red: trail, scaled to same peak intensity of zero order
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150722a8-trail.png



150722a8cal2d2.png
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spectrum of beginning zoomed
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150722a8cal2d2.png


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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: Thu Jul 30, 2015 1:22 am    記事の件名: CAP spectrum 引用付きで返信

Hi Bill,

I am making up a new 4K spectral camera system using UFOCaptureHD2. ( SONY alpha 7s + 24mm lens + 600 lines grating, 24p )
It has some problems but it was started to observe before a few weeks ago.
A CAP small fireball (-3 Mag) was captured tonight, fortunatly.

I'm interesting about classfication of meteor spectrum, too. The fireball is looks Na - Mg strong type.

I hope to take SDN shower meteor spectra because the orbit has a very small perihelion distance.


Hello Martin,
Thank you for introduce my spectrum in your presentaion.
I think your calibration method is effective for a transmission grating.


Koji Maeda



M20150729_233324_JPMZ1_HEPss.jpg
 説明:
1/4 size of 4K image

23:33:24 JST = UT + 09H
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M20150729_233324_JPMZ1_HEPss.jpg



M20150729_233324_JPMZ1_HEPcut1_800p.jpg
 説明:
triming from 4K image and a little correction
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M20150729_233324_JPMZ1_HEPcut1_800p.jpg




最終編集者 前田 [ Sat Aug 01, 2015 9:30 am ], 編集回数 1 回
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