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From what I see, regarding the 8 mag targets with the amateurs' own equipment, taking spectra at good S/N is a challenge.. If the 1h observation length is so necessary, I was going to suggest that observations be scheduled with redundancy, so that several observers could take spectra that could be combined together to improve S/N.. Of course, this would not improve much.. in theory perhaps twice the number of observations would get sqrt(2) times better SNR.. But the time coverage would be respected. Naturally, processing would be made more complex.. This could only be viable if there are a large number of observers too.. (?)
On a side question, how do I determine S/N from a spectrum? I'd like to estimate this with my acquisitions too, I do not know if values provided by software that calculate it for stars in a 2D image are of interest in terms of a 1D spectrum. Is it simply to divide the mean by the stdev on some particular place of the spectrum? Should this be measured in the continuum or the in the emission/absorption of interest?
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