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As Andrew has pointed out the cal 2 line should be H beta...

A tip: Look at your earlier spectrum (copy attached) - look for the overall shape (caused by your camera QE curve) and note any similarities  - bumps and hollows compare to the current spectrum.

If you are using the same set up night after night, then the dispersion will remain unchanged, it looks like you have 8.65 A/pixel from your previous spectrum. This provides a sanity check with other spectra - in fact can be used to assist in calibration - one point with dispersion -

Once you've done a few spectra successfully all this will become second nature.....

 

nigellabryant-02.jpg

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13 minutes ago, Merlin66 said:

As Andrew has pointed out the cal 2 line should be H beta...

A tip: Look at your earlier spectrum (copy attached) - look for the overall shape (caused by your camera QE curve) and note any similarities  - bumps and hollows compare to the current spectrum.

If you are using the same set up night after night, then the dispersion will remain unchanged, it looks like you have 8.65 A/pixel from your previous spectrum. This provides a sanity check with other spectra - in fact can be used to assist in calibration - one point with dispersion -

Once you've done a few spectra successfully all this will become second nature.....

 

nigellabryant-02.jpg

Many thanks, much appreciated. I'll get there, eventually, lol. 

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