Sh2-155 commonly named the cave nebula is part of the Cepheus OB3 association. The new stars born in the interior of the dust cloud and the ultraviolet energy produce the ionization of the Hydrogen, Sulfure and Oxigen elements.

The image has been taken in three different nights and the total exposure is ten hours. The filters used for obtain this image are Astrodon H-alpha, Sulfure II and Oxygen III.