RELCO Starter Spectrum from CCDSPEC at LRO graphed against Three Hills Observatory ALPY data and with lines identified including those used by ISIS for calibration

On the RELCO starter spectrum below, my CCDSPEC spectrum is graphed against the ALPY spectrum from Three HIlls Observatory from Robin above, and I have marked the lines I identified together with those lines that ISIS use for calibration – this gives some more lines for me to use at LRO.

Comment from Robin at Three Hills Observatory (https://stargazerslounge.com/topic/226911-neon-lamp-to-set-spectroscope/), “Your spectrograph has roughly the same resolution as the ALPY (R~500) and these lines are known to be reliable and give a very accurate calibration to better than 1A with the ALPY.  I have attached a list of wavelengths of the 13 lines. They correspond to lines identified in the spectrum by Richard Walker using his DADOS with 200l/mm grating (R 900).  If you identify as many of the lines in your spectrum as possible and make a 3rd order fit,  any wrongly identified lines will immediately stand out as they will have larger errors.”

Lines used by ISIS to calibrate ALPY

  • 3946.1A
  • 4158.59A
  • 4510.73A
  • 4545.05A
  • 4657.9A
  • 4764.87A
  • 4965.08A
  • 5400.56A
  • 5852.49A
  • 6266.49A
  • 6506.53A
  • 7147.04A
  • 7383.98A

Andy

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