Sharpless 2-155 (Caldwell 9), the Cave Nebula   HOME INDEX BACK NEXT
 

Diffuse nebula in Cepheus

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Star-hop chart

This is an emission nebula, glowing with the light of ionized hydrogen. The nebula is large and dim with a low surface brightness, and it can be a challenge to find it. The brightest portions of the nebula form a C shape around a dark nebula in the center, so it can be visualized as the entrance to a cave.

Magnitude 7.7
Apparent Size 50' x 30'
Distance (light yrs) 2,700
Right Ascension 22:56.8
Declination +62 37
Field of View 2.08 x 1.17 deg

Image details:  28 exposures of 30 seconds each, taken with a Dwarf Mini telescope.

August 2026