Sh2-140 is an HII emission nebula on the edge of the Cepheus ring and part of the star-forming region of Cepheus molecular complex. The emission is caused by the radiation of young stars in the central part of the nebula which also causes a bow shock towards the outer edge of the strong Ha emission region.
The small blue reflection nebula on the right side of the image is catalogued as GN 22 12.3
More Ha integration could probably help highlight the very faint Ha emissions surrounding the nebula, maybe I’ll revisit it in the future
Total integration 16 hours in HaLRGB (8hrs L, 4hrs R/G/B, 4hrs Ha)
High resolution here