Sh2-155 is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula, though that name was applied earlier to Ced 201, a different nebula in Cepheus.

Magnitude: 7.7

Constellation: Cepheus

Apparent magnitude (V): 7.7

Apparent dimensions (V): 50.0'x30.0'

Distance: 2400 ly