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Sh 2-155, from the Sharpless catalog, also known as the Cave Nebula, is a diffuse nebula in the constellation Cepheus, within a large nebula complex containing emission, reflection and dark nebulae. Sh 2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 2400 light-years from Earth.

Technical details, high resolution and annotated versions available on Telescopius: https://telescopius.com/pictures/view/199742/deep_sky/sh-2-155/by-drgfreeman

Image license: CC BY-NC-SA 4.0.

#astrophotography #astronomy #photography #astrodon #nebula #DeepSky #space #sh2-155 #RGBHa #KStars #ekos #phd2 #GIMP

At the center of a dense star field, the cave nebula is a cloud of red ionized hydrogen gas forming a C shape with the opening oriented towards the top-right of the image.

A large dark cloud of interstellar dust located on the left of the nebula blocks the light from the emission nebula and background stars. Multiple smaller dark clouds can be seen around the nebula.

A large orange star is located between the center of the nebula and the large dust cloud.

In the top left corner, the light from two large stars reflect on the surrounding interstellar dust, forming a light blue halo.

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