This is a notable star cluster in Cassiopeia that is missing from the Messier catalogue. The brightest members of this cluster are highly evolved orange giant stars and the cluster itself is quite old for an object of this type.
This seems to be a popular target for visual observation and it is one of the few deep space objects in Cassiopeia that shows up clearly in wide-field, broad-band images of this region. Some of the other candidates are the Owl Cluster (NGC 457), the Double Cluster, M103, the Pacman Nebula, and to a lesser extent the Heart and Soul Nebulae (the latter better in deeper narrow-band images). See my next post for a shot of the Cassiopeia area taken with a 35mm lens and a Nikon D5100.
The image was taken with an uncooled QHY5III-178C camera (just under one hour of total integration time, 707 x 5s, gain zero) using a Stellarvue SV80ST2 scope with a 0.8X Stellarvue reducer all carried unguided on a Celestron AVX mount. Image capture using SharpCap, image processing with PixInsight and Photoshop CC2019.
I'm not completely happy with this result, since I think it would be better to use a longer exposure setting than 5 seconds to capture the fainter members of the cluster. Also, the framing is a little too tight, it would be better to have a wider field and perhaps next time I will use my ASI183MM camera on a guided mount. Lastly, it was hard to get a good JPEG compression result on this given the 500KB limit here on CN. Or, those are among my excuses for any shortcomings.
However, I do think this serves as a decent example of what can be done with a relatively inexpensive, uncooled CMOS camera using short, unguided exposures on a relatively low-end mount and all done rather quickly under red/orange zone light pollution. That said, the Stellarvue scope is no slouch although the 0.8X reducer was never that great (since discontinued by Stellarvue, perhaps for cause).
Edited by james7ca, 11 September 2019 - 08:24 AM.