Caldwell 9 Diffuse Nebula in the Constellation Cepheus

Caldwell 9 Diffuse Nebula in the Constellation Cepheus

 

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. (Wikipedia.org)

 

Technical Information for Image

 

Telescope: William Optics Zenithstar 81 Refractor

Mount: iOptron CEM25P

Imaging Camera: ZWO ASI294MC. Gain 120. Cooled to -5C.

Filter: Optolong L-Pro ... Although I should have used the Optolong L-Enhance filter.

Guiding: William Optics 50mm, 200mm FL, ASI290MC camera

Exposures: 17 x 240s Bin 2x2

Capture, Guiding, Polar Alignment: ZWO ASIAIR PRO

Site: Borrego Springs, CA USA, Bortle 4

Processing: Pixinsight with Final Touchup in Corel PaintShop Pro.

 

Done