Quote:
Originally Posted by codemonkey
Definitely helps, thanks S! If it's not too much trouble (seriously, don't bother if it is), would you happen to know the median in each of those?
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No problemo...
Median FWHM values in arcseconds for my 4" telescope:
Ha: 2.79 (24 subs collected over 3 different nights)
S2: 2.48 (also 24 subs over another 3 nights)
O3: 2.45 (16 subs, over 2 different nights)
8 nights in total so far...Yes, I know, it has been a slow process collecting data for this DSO...
Since eccentricity for all subs was in the range of 0.49-0.51 (in PixInsight eccentricity of zero is for perfectly round stars, and eccentricity as high as 0.42 is not noticable by most people) - there is some elongation to the stars, but consistent across all subs, indicating consistent tracking. I suspect tracking errors in RA axis to be the main cause.
So perhaps real seeing has been somewhat better than the above values suggest?