The Cave Nebula

Image Acquisition Details: 50x 300s subs, total 4.5 hrs.

Equipment:

• William Optics Zenith Star Z73 APO telescope

• Optolong L-Pro Filter

• ZWO ASI 294 MC Pro Camera @ -10 c

• Skywatcher EQM-35 mount

• Guided using ASIair Pro.

About SH2-155:

Sh2-155 (also designated Caldwell 9, Sharpless 155 or S155) 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. Sh2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs (2400 light-years) from Earth.