Image Data : Camera : SBIG ST2000XM Telescope : Williams Optics 72mm Magrez APO Mount : Paramount ME Total Exposure : 1 hour 25 mins Sub Frames : 17 x 5 min Auto Guiding : No Filters : Deep Sky Filter Image Capture Software : CCDSoft Processing Software : CCDStack, Iris Other Designations : Sh2-155 Object Information : C9 is an Emission Nebula in Cepheus. Known as the Cave Nebula. The Cave Nebula, Sh2-155 or Caldwell 9, is a dim and very diffuse bright nebula within a larger nebula complex containing emmison, reflection, and dark nebulosity. 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 that has the appearance of a deep cave. Information care of Wikipedia | ||||||||||||||||||||||||||