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Bill W
登録日: 2012.02.13 記事: 182 所在地: Glasgow
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日時: Sun Apr 12, 2015 8:13 am 記事の件名: |
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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.
Cheers,
Bill.
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Bill W
登録日: 2012.02.13 記事: 182 所在地: Glasgow
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Bill W
登録日: 2012.02.13 記事: 182 所在地: Glasgow
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日時: Fri Apr 24, 2015 9:06 pm 記事の件名: |
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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
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日時: Sat Apr 25, 2015 7:14 am 記事の件名: |
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Nice video
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Bill W
登録日: 2012.02.13 記事: 182 所在地: Glasgow
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日時: Sun Apr 26, 2015 9:17 pm 記事の件名: |
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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
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日時: Tue Apr 28, 2015 10:20 pm 記事の件名: |
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Amazing spectra Bill !!
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APODman
登録日: 2011.01.08 記事: 34
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日時: Tue Apr 28, 2015 10:57 pm 記事の件名: |
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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
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日時: Tue Apr 28, 2015 11:00 pm 記事の件名: |
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Spectrum analysis
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Bill W
登録日: 2012.02.13 記事: 182 所在地: Glasgow
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Martin Dubs
登録日: 2014.03.04 記事: 56
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日時: Sun Jun 28, 2015 1:56 am 記事の件名: |
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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
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meteor spectrum Watec 902H2 with 600L/mm grating, calibrated |
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Lyrid meteor spectrum from 20150423_2302 same calibration (red) compared to reference from http://members.shaw.ca/epmajden/ |
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Martin Dubs
登録日: 2014.03.04 記事: 56
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日時: Mon Jun 29, 2015 1:09 am 記事の件名: |
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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
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comparison with Madiedo La Donana fireball (my spectrum red) |
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Bill W
登録日: 2012.02.13 記事: 182 所在地: Glasgow
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Bill W
登録日: 2012.02.13 記事: 182 所在地: Glasgow
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日時: Wed Jul 22, 2015 9:56 pm 記事の件名: |
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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.
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Martin Dubs
登録日: 2014.03.04 記事: 56
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日時: Fri Jul 24, 2015 4:30 am 記事の件名: |
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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
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stacked spectrum of beginning of meteor |
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added 7 fields of persistent trail after passage of meteor |
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spectra comparison corresponding to beginning and trail. Blue: beginning, red: trail, scaled to same peak intensity of zero order |
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spectrum of beginning zoomed |
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前田
登録日: 2004.09.01 記事: 2754 所在地: Miyazai JAPAN (E131.4, N31.8)
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日時: Thu Jul 30, 2015 1:22 am 記事の件名: CAP spectrum |
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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
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1/4 size of 4K image
23:33:24 JST = UT + 09H |
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triming from 4K image and a little correction |
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最終編集者 前田 [ Sat Aug 01, 2015 9:30 am ], 編集回数 1 回 |
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