Bill Ward


Another interesting spectrum to consider. I caught an usual spectrum on the morning of the 13th. Unusually it only had one bright line in the green. I initially assumed this would be magnesium. WRONG! The alarm was raised when the atmospheric lines (to the right hand side of the spectra) didn’t fit. After trying a few lines from the NIST reference library the best candidate was from iron. Re calibrating using the atmospheric oxygen line,  the green line did seem to fit with an iron emission. So did the blue iron and calcium lines. So I’m confident this is a reasonable fit.

I’ve compared it to the spectro-orbital capture from the 4th to show the differences. The one from the 4th looks like a stony/stony iron with the rich Fe, Mg and Na lines. What this one is I don’t know.

Yet another one for the zoo….