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Equipment Discussions >> Electronically Assisted Astronomy

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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
spectrum of supernova in M82 last night new
      #6336530 - 01/26/14 12:09 PM Attachment (42 downloads)

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

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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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: spectrum of supernova in M82 last night new [Re: nytecam]
      #6336557 - 01/26/14 12:21 PM Attachment (23 downloads)

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

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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: spectrum of supernova in M82 last night new [Re: nytecam]
      #6336586 - 01/26/14 12:30 PM Attachment (33 downloads)

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

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highfnum
Carpal Tunnel
*****

Reged: 09/06/06

Loc: NE USA
Re: spectrum of supernova in M82 last night new [Re: nytecam]
      #6336630 - 01/26/14 12:50 PM

cool

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bhuvfe
member


Reged: 01/14/11

Re: spectrum of supernova in M82 last night new [Re: nytecam]
      #6336697 - 01/26/14 01:25 PM

Nice work!!

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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: spectrum of supernova in M82 last night new [Re: bhuvfe]
      #6338061 - 01/27/14 03:38 AM

Thanks guys for your interest - much appreciated :-)

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geminijk
scholastic sledgehammer


Reged: 04/03/08

Loc: TN
Re: spectrum of supernova in M82 last night new [Re: nytecam]
      #6341586 - 01/28/14 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


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geminijk
scholastic sledgehammer


Reged: 04/03/08

Loc: TN
Re: spectrum of supernova in M82 last night new [Re: nytecam]
      #6341587 - 01/28/14 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


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: spectrum of supernova in M82 last night new [Re: geminijk]
      #6342336 - 01/29/14 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 :-)

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ngchunter
super member


Reged: 10/09/09

Loc: Sarasota, FL
Re: spectrum of supernova in M82 last night new [Re: nytecam]
      #6343274 - 01/29/14 02:37 PM

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

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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: spectrum of supernova in M82 last night new [Re: ngchunter]
      #6344779 - 01/30/14 09:42 AM

Quote:

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

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rmollise
Postmaster
*****

Reged: 07/06/07

Re: spectrum of supernova in M82 last night [Re: nytecam]
      #6344858 - 01/30/14 10:37 AM

Quote:

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




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.


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