Messier 39 (also known as M39, or NGC 7092) is an open cluster in the constellation of Cygnus. It was discovered by Charles Messier in 1764. M39 is at a distance of about 1,060 light-years from Earth whose age is estimated to be from 278 million years.
Data captured 11th & 15th November, 2018.
15x 2 minute exposures with Blue filter (Binned 2x2).
18x 2 minute exposures with Green filter (Binned 2x2).
15x 2 minute exposures with Red filter (Binned 2x2).
59x 3 minute exposures with Luminance filter.
Total Exposure = 4.5 hours.
Skywatcher Quattro 200 CF
Atik 428EX Mono
This image was processed in Pixinsight & Lightroom.
Calibration and Stacking in Pixinsight using Batch PreProcessing
Automatic Background Extraction - To remove gradients. (Each Channel separately)
Channel Combination - To combine RGB channels.
Photometric Colour Calibration - To calibrate colours.
SCNR - To remove green cast.
Deconvolution - To tighten stars, 50 iterations. (Luminance Only)
Multiscale Linear Transform - To noise reduce the Luminance only.
LRGB Combination - To blend my luminance image with my RGB image.
Histogram Transformation - To stretch the LRGB image.
Curves Transformation - To boost contrast.
Export as JPEG and import into Lightroom.
Increase Contrast (+10)
Increase Blue Saturation (+100)
Increase Aqua Saturation (+100)
Decrease Red Saturation (-100)
Export final JPEG for upload.