C9 · nebula

Cave Nebula

Sh 2-155 is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity.

RA22h 56m 52sDec+62° 31' 04"

Image: Hewholooks. CC BY-SA 3.0, via Wikimedia Commons.

Identity & coordinates

Identification

Primary designation: C9
All designations: C9 · Sh2-155 · Cave Nebula
Object type: Nebula
Constellation: Cepheus
Best viewing: Autumn · Winter

Coordinates & physical

Right ascension (J2000): 22h 56m 52s
Declination (J2000): +62° 31' 04"
Apparent magnitude (V): —
Distance: 2.4 thousand ly

III

Visibility tonight

The science

Sh 2-155 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. Sh 2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs from Earth.

Summary adapted from Wikipedia · CC-BY-SA-4.0