Star shape/ eccentricity warning?
Posted: Mon Jul 19, 2021 4:08 pm
Hi Robin
SC already calculates FWHM on the fly during livestacking. I guess - and I think that you have mentioned? - that Eccentricity is inherent to the same calculation if FWHM is averaged across orthogonal directions
It could also be useful to display that information - if only just as a warning alert whenever star shapes look odd. (say Eccen > 0.65?). More ideally one could filter frames out on that basis.
Obviously there are lots of possible causes -- poor guiding, tube currents, cable snags or as in my case recently -tilt- camera not fully square to optic axis.
Would be generally useful I think though because an early warning could save hours of wasted capture
Tim
SC already calculates FWHM on the fly during livestacking. I guess - and I think that you have mentioned? - that Eccentricity is inherent to the same calculation if FWHM is averaged across orthogonal directions
It could also be useful to display that information - if only just as a warning alert whenever star shapes look odd. (say Eccen > 0.65?). More ideally one could filter frames out on that basis.
Obviously there are lots of possible causes -- poor guiding, tube currents, cable snags or as in my case recently -tilt- camera not fully square to optic axis.
Would be generally useful I think though because an early warning could save hours of wasted capture
Tim