The Cave Nebula, Sh2-155 or Caldwell 9, is a dim and very diffuse bright nebula within a larger nebula complex containing emission, reflection, and dark nebulosity. It is located in the constellation Cepheus.
Visually it is a difficult object, but with adequate exposure, makes a striking image. The nebula gets its name Cave Nebula from the dark lane at the eastern side abutting the brightest curve of emission nebulosity which gives the appearance of a deep cave when seen through a telescope visually (Wikipedia).
Bi-colour Narrow Band HaOO composition, total integration 5.3 hrs, December 2014. Takahashi FSQ85 EDX at F3.9 - Avalon Linear Fast Reverse - Atik 460EX - Astrodon 5nm filters.
Sh2155The Cave Nebula