Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

spectroscopy

  • Please log in to reply
4 replies to this topic

#1 Webb1104

Webb1104

    Lift Off

  • -----
  • topic starter
  • Posts: 17
  • Joined: 24 Oct 2018
  • Loc: Missouri, USA (KC Side)

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

555aaa

    Vendor (Xerxes Scientific)

  • *****
  • Vendors
  • Posts: 1482
  • Joined: 09 Aug 2016
  • Loc: Lynnwood, WA, USA

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. 


  • Jamey L Jenkins, PartlyCloudy and Webb1104 like this

#3 robin_astro

robin_astro

    Viking 1

  • -----
  • Posts: 756
  • Joined: 18 Dec 2005

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.

  • brave_ulysses, Stu Todd, 555aaa and 2 others like this

#4 Webb1104

Webb1104

    Lift Off

  • -----
  • topic starter
  • Posts: 17
  • Joined: 24 Oct 2018
  • Loc: Missouri, USA (KC Side)

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

Tom Stock

    Ranger 4

  • *****
  • Posts: 385
  • Joined: 27 Jun 2010

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.

Attached Thumbnails

  • test.png

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



CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics