3hrs of exposure for this nice edge-on galaxy. It got cloudy towards the end of the run and there was a serious guiding error on the full 61×180 sec stack. But, I managed to salvage the stack by copying the background and galaxy and pasting that in as a lightened blend on top of a 47×180 sec saved stack for the stars that did not have a guiding error. Lucky I saved it before it got ruined.
I was having a good night of steady seeing and really good guiding (<1.13 arc sec error) for this object and the Pleiades on this night. I went until it was time to flip and the guiding was starting to degrade. 78 minutes worth of subs was good enough to show this object well.
Not too bad for a session from the metro LP zone! Only 96 minutes, but it was enough with these settings to show quite a bit of nebulousity. I used the unity gain setting (11) and that made a big difference in hot pixels and noise. My other shots at a gain of 20 were plagued by hot pixels that SharpCap 3.2 doesn’t seem to be able to deal with very well. I like this much better and there is just as much data buried in there as in the higher gain shots.
Over 4.6 hours of integration with a variety of exposures including 3 min, 2 min and 30 sec sub-images. All were taken with a QHY183c camera at -20C or -15C cooling, an Optolong L-eNhance filter and a Televue TV-85 at F/5.6.
thors-helmet-25×180-g20-o100-lnh-qhy183c_-20C-85f5_6-crop plus thors-helmet-30×120-g20-284×30-g37-o200-lnh-qhy183c_-15C-85f5_6-v2a