This emission nebula lies deep in the constellation of Cepheus the King. Its structure resembles the shape of a cave in space.
RGB image
I took this image using my 80mm f/6.3 refractor, a vixen Atlux mount, PHD autu-guiding and an Atik 383L mono CCD camera with a set of Astronomik narrowband filters.
On the first evening I set the camera on x2 bin mode, capturing 2.5 minute sub-frames with total exposure times of 30 minutes for each of the filters, SII, OIII and H-alpha.
Bi-colour image
On the second evening I set the camera on x1 bin mode, capturing 5 minute sub-frames using a H-alpha filter. The total exposure time using the H-alpha filter was 120 minutes.
Hubble palette
