Bi-colour image
Narrowband
Hubble Palette
RGB Narrowband composite
This final image of the Cocoon nebula has additional exposure of three and a half hours using a H-alpha filter. A total exposure time of four hours and forty minutes.
Saturday, 16 December 2017
IC5146 The Cocoon nebula.
This reflection emission nebula lies in the constellation of Cygnus the swan. Unfortunately the clouds on this particular evening were closing in, I only had a total of about one hour and ten minutes of imaging time; therefore these images have more noise in them than some of my previous images. I captured five minute sub frames with matching dark frame and combined them with flat field frames to reduce the effect of vignetting in the final image. The telescope I was using was my ten inch F4.8 reflector, a Vixen Atlux mount, an Atik 383L mono CCD camera and PHD auto guiding. The exposure times were 35 minutes using a H-alpha filter , ten minutes using an SII filter, ten minutes using an OIII filter and fifteen minutes using a blue filter.
This final image of the Cocoon nebula has additional exposure of three and a half hours using a H-alpha filter. A total exposure time of four hours and forty minutes.
This final image of the Cocoon nebula has additional exposure of three and a half hours using a H-alpha filter. A total exposure time of four hours and forty minutes.
