Cepheus attacks again – this time with the Cave nebula (aka Sh2-155 or Caldwell 9). It is beautiful object in LRGB, but requires dark sky for this technique. My backyard sky is not so fortunate, so I decided to picture it with HaRGB filter set. There is 12 hours of exposures total with 130mm triplet refractor and Atik383 camera.
At the lower right part there is vdB155 reflection nebula. And little bit to the left – faint, but evidently red carbon star.