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spectrum of supernova in M82 last night

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#1 nytecam

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Posted 26 January 2014 - 12:09 PM

Here's a lo-res spectrum of SN2014J taken 1x30s exposure with a Rainbow Optics [RO] grating Selotaped over my mono Lodestar-M cam from last night! Topping it is a regular 1x30s colour shot via the Lodestar-C all from my 12" f/3.3 SCT :grin:

A few lines link the spectrum to the colour image and show the bright red galaxy core emits in H-alpha [this is coming out in other amateur spectro pics too]. The absorption band in mid spectrum is caused by silicon [Si] in the supernova's atmosphere typical of Type I [binary] supernova so it's very pleasing to capture it and [crudely] classify a supernova. Type II supernova are a singular stellar core collapse where H-alpha is strongly emitted but absent here ;)

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#2 nytecam

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Posted 26 January 2014 - 12:21 PM

Here's my RO grating selotaped to the camera - I don't have a suitable coupling ring for the C-ring thread on the camera! The 'blazed' grating is just like a regular 1-1/4" screw-in filter. It's transparent [top right] and so the real target [in this case M82] is recorded with the spectrum off to one side split according to wavelength - blue nearest to the real image and red remote - good fun :grin:

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#3 nytecam

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Posted 26 January 2014 - 12:30 PM

Here's my first effort last night at the scope showing the full Lodestar-M frame - the Si dip in mid spectrum of SN clearly seen on download and refresh :grin:

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#4 highfnum

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Posted 26 January 2014 - 12:50 PM

cool

#5 bhuvfe

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Posted 26 January 2014 - 01:25 PM

Nice work!!

#6 nytecam

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Posted 27 January 2014 - 03:38 AM

Thanks guys for your interest - much appreciated :-)

#7 geminijk

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Posted 28 January 2014 - 06:17 PM

I want to do the very same thing! that is so cool thanks for sharing!

which is better to get the spectrum a mono or color camera?

John

#8 geminijk

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Posted 28 January 2014 - 06:17 PM

I want to do the very same thing! that is so cool thanks for sharing!

which is better to get the spectrum a mono or color camera?

John

#9 nytecam

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Posted 29 January 2014 - 04:00 AM

John - you need a Rainbow Optics or Staranalyser grating like shown in my pics results are better in mono but you can always dump the colour info from a colour camera - good luck :-)

#10 ngchunter

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Posted 29 January 2014 - 02:37 PM

Very nice, how do you generate the graph seen in the first image? Is that a function in ImageJ or AstroimageJ?

#11 nytecam

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Posted 30 January 2014 - 09:42 AM

Very nice, how do you generate the graph seen in the first image? Is that a function in ImageJ or AstroimageJ?

You have to import the spectrum into AstroArt or equal to make an 2D intensity plot :grin:

#12 rmollise

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Posted 30 January 2014 - 10:37 AM

You have to import the spectrum into AstroArt or equal to make an 2D intensity plot :grin:


Or make it easy on yourself and use RSpec. I have had very good luck obtaining spectra with a color camera. At any rate, nice work. :cool:


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