This 1 x 2 mosaic of this area between Cassiopeia and Cepheus was taken in 4 warm nights in September 2023. Unfortunately the high sensor temperature has generated thermal noise that has compromised the quality of the whole work. I publish it here mainly for documentation purposes, and also because the field contains so many interesting objects worth to be described, in particular the WR157 that is the one shaping the upper part of the Lobster Nebula. I am also not happy with my mosaic processing in PixInsight. Notwithstanding all my efforts to equalize accurately the two panels, when I was stitching them together the GradientMergeMosaic process was making the upper panel slightly brighter than the lower. Probably there is something in the images that is biasing the process in that direction. On the other side, the MosaicByCoordinates process is much more robust and easy that the past method based on StarAlignement.

I list here more details about this rich sky-scape.

Sh2-161
Coordinates: (111.87°, 1.06°)
Sh 2-161 is a large diffuse nebula surrounding the much smaller and luminous and better studied Sh 2-158.
The BFS catalog argues that Sh 2-161 is actually two distinct nebulae in the same line of sight, which they designate Sh 2-161a and Sh 2-161b. Sharpless himself made no such distinction.
Curiously, however, the distance estimates given in the scientific literature for the two nebulae are almost identical despite the quite different velocities quoted for the gas in this direction.

Sh2-158 NCG7538 and Sh 2-159 LBN 543
Coordinates: (111.5°, 0.8°) and (111.6°, 0.4°)
This is a major star formation region in the Cas OB2 association. It is surrounded by the much larger diffuse nebula Sh 2-161B. Russeil combines Sh 2-158 and Sh 2-159 into one star formation region. The two nebulae can be seen embedded in the common dust cloud [UUT2000] in Infrared Images.

M52
It is an open cluster distant 4.6 kly, with an age of 158 My. The brightness of the cluster is dimmed by extinction, which is stronger in the southern half. The cluster has a core radius of 3 ly and a tidal radius of 43 ly. The core of the cluster shows a lack of interstellar matter, which may be due to supernovae explosions early in the cluster's history.

Sh2-162 NGC7635 Bubble Nebula
Coordinates: (112.2°, 0.2°)
This is a circular shell 7 ly wide and 7.2 kly distant, around the O6.5 IIIf star BD +60°2522. The nebula also contains the infrared cluster [BDS2003] 44. The Bubble nebula is also bright at radio frequencies. A wider description is attached to my closeup image taken with a longer focal in 2021.

Sh2-157 and WR157
Coordinates: (111.29°, -0.66°)
The northern portion of Sh 2-157 (Sim 13, sometimes known as Sh 2-157a) is a ring nebula around the Wolf-Rayet star WR 157, in the Basel 3 star cluster that is in turn part of the Cas OB2 association. The southern portion of Sh 2-157 (Sim 14) may be ionized by stars not belonging to Basel 3.

NGC7510
NGC 7510 is an open cluster of stars located around 11.4 kly away. At this distance, the light from the cluster has undergone extinction from interstellar gas and dust equal to 0.90 magnitudes. This cluster forms part of the Perseus Spiral Arm, connected to Sh2-156 (see below), and is around 10 million years old.

Sh2-156 IC1470
Coordinates: (110.1°, 0.0°)
This HII region is part of the star cluster NGC 7510 according to Avedisova. It appears to be ionized by a single O7 class star. Distance estimates range from 2.7 to 5.3 kpc according to Simbad.

(data mostly excerpted from galaxymap.org)