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spectroscopy

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#1 Webb1104

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Posted 12 October 2019 - 12:29 PM

Good Afternoon,

I am wondering if anybody knows a cheap way to build or purchase a spectrometer for an 8” Newtonian telescope.  I am really fascinated in learning and working with the light spectrum of stars.  Any help in this would be greatly appreciated.

 

Thank You

 

James



#2 555aaa

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Posted 12 October 2019 - 02:45 PM

The shelyak star analyzer is a transmission grating that you put in front of the camera like a filter. The have a whole range of spectrographs. 


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#3 robin_astro

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Posted 14 October 2019 - 05:47 AM

The Paton Hawksley Star Analyser is probably the simplest way to start. Beyond that, the Shelyak  ALPY 600 is a popular entry level instrument but is still a big step up in cost. (Allow for the guider module in your budget). A browse of this section will show examples from both. For a low cost self build spectrograph which actually works, I can suggest the 3D printed Lowspec 

https://www.thingive...m/thing:2455390

 

Cheers

Robin


Edited by robin_astro, 14 October 2019 - 05:48 AM.

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#4 Webb1104

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Posted 26 October 2019 - 05:30 PM

Awesome!! Thank you so much for the Spectroscopy information!!  Can’t wait to get started and I will post photos and analysis when completed!! 
 

thanks!

 

James



#5 Tom Stock

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Posted 10 November 2019 - 01:40 PM

I removed the top of a CD with duct tape, cut a disk of the clear remaining part of the CD so that it could replace the glass from a crummy chinese moon filter I had in my junk box.  This provides a diffraction grating of around 600LPI

 

Took a photo with my ASI120MC and "all sky" lens of my cell phone flashlight across the room.

 

below is the result 

 

The difficulty I am having now is trying to find software for spectroscopy.  There is RSPec but it doesn't run on the mac.

 

AstroImageJ is free, and there is a spectroscopy plugin, but I could not get it to actually work, it complains about missing PlotTool class.

 

Anyone using AstroImageJ for spectroscopy?

 

BTW I just found a source for 100LPI diffraction gratings  for $5 shipped.  Will let you know if that one works but it won't be here for a month or so and it may be completely useless.

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Edited by Tom Stock, 10 November 2019 - 01:47 PM.


#6 Kisslija

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Posted 28 April 2020 - 09:57 PM

Does anyone know if the Shelyak Star Analyser (SA-100) is the same filter as the Field Tested Systems Star Analyzer (also SA-100)? 
 

https://store.fieldt...ser-100-grating

 

https://www.shelyak..../star-analyser/

 

https://optcorp.com/...q=Star analyser
 



#7 robin_astro

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Posted 29 April 2020 - 06:14 AM

Does anyone know if the Shelyak Star Analyser (SA-100) is the same filter as the Field Tested Systems Star Analyzer (also SA-100)? 
 

https://store.fieldt...ser-100-grating

 

https://www.shelyak..../star-analyser/

 

https://optcorp.com/...q=Star analyser
 

Yes they are all the Paton Hawksley Star Analyser (which I developed with Paton Hawksley in 2004) and are manufactured in the UK by Paton Hawksley Education Ltd

 

https://www.patonhaw...com/astronomy-1

 

Cheers

Robin



#8 Kisslija

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Posted 30 April 2020 - 12:35 AM

Thanks Robin!




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