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Thanks for the offer, I had to dig out my old manual and notes, and nearly called as I was tearing my hair out a one point but I think I’ve got it sorted out.
Analyser classifys it as a sporadic! (it classes the spectrum as a ” -6 flash”). I don’t know how reliable it ultimately is, only a handful of reference stars.
So, there’s at least the possibility that previous professional work might have been based on erroneous assumptions.
Score one for the amateur 🙂
I suppose the next thing to do is to have a look at the Quadrantids parent body. In a previous post I said “sodium deficiency” but that should have been “sodium defficiency with respect to magnesium” as there is no prior knowledge that the material isn’t just like that! The issue with the gemininds is that the sodium has been some how lost due to its orbit and low perihelion distance.
Of course it could all be a lot of nonsense! 😉