This image is a combination of 4 layers. Layer 1 is Clear is a combination of 60 images, each of 60 seconds. Layer 2 is Red is a combination of 5 images, each of 60 seconds. Layer 3 is Green is a combination of 5 images, each of 60 seconds. Layer 4 is Blue is a combination of 5 images, each of 60 seconds. Each of the images was corrected with a dark frame and a flat field. The images taken with a SBIG STT-8300 3 CCD Camera attached to an Centurion 18” F/2.8 telescope.
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