Sh 2-122 is likely a reflection nebula illuminated by an embedded but unseen star and associated with the molecular cloud MBM 55, at a distance of 150 pc. Markab is just out of the frame hence the intrusive spike of light at the top. Sigh.
Image Data:Scope: AP155EDF
Camera: Apogee Moravian G4 (16803 ccd) w Astrodon Gen II Filters
Mount: Paramount MX
23 x 10 minutes Luminance
9/9/9 x 10min of RGB
Lucknow, Ontario, Canada
Sept 2023
Images acquired using CCD-Commander and TheSkyX
Reduction and all pre-processing in PixInsight.
RGB processed in PixInsight using SPCC, BlurX, NoiseX then HistogramTransformation, Curves and a masked Saturation boost.
Luminance processed in PixInsight using BlurX, NoiseX then HistogramTransformation, Curves and LocalHistogramTransformation (for contrast)
Moved to Photoshop where the Luminance was layered on the RGB and then additinal processing for noise, colour and contrast.