Hi,
I Initially thought the line to the right were a second order also but I’m not sure. Careful examination reveals the separations don’t quite tie up with twice the wavelength even correcting for the slight non linearity of the dispersion.
Checking through the NIST data base there are over 2000 Fe lines listed from 350-450nm. Looking at the “stronger” ones I still can’t get a clean fit.
I’m sure I’m imposing am image scale bias, as this one is very large for a meteor spectrum. 35mm focal length is positively a telephoto lens in the meteor observing world.
I’ve chopped the spectrum into shorter sections from a single 45ms slice (it looks quite different when examined this way, a curious psychological effect.)
It may or may not help….! ; – )