Cave Nebula/Sh2-155 or Caldwell 9
The Cave Nebula, Sh2-155 or Caldwell 9, is a dim and very diffuse bright nebula within a larger nebula complex containing emission, reflection, and dark nebulosity. It is located in the constellation Cepheus.
Visually it is a difficult object, but with adequate exposure, makes a striking image. The nebula gets its name from the dark lane at the eastern side abutting the brightest curve of emission nebulosity which gives the appearance of a deep cave when seen through a telescope visually.
Taken from DGRO Rancho Hidalgo Animas, New Mexico
14.5" RCOS F8, Apogee U16M High Cooling
HA 480 min, Luminance 180 min, Red 180min, Green 140 min, Blue 180min
Calibrated,combined in CCD Stack all other processing done using PS5.