Imaging telescope or lens: Takahashi FSQ-106 ED
Imaging camera: Starlight Xpress SX-814 Trius Monochrome CCD
Mount: Sky-Watcher EZ-EQ6 GT
Guiding camera: Starlight-XPress Lodestar Autoguider
Dates: Oct. 1, 2017
Integration: 4.2 hours
Avg. Moon age: 10.46 days
Avg. Moon phase: 80.45%
Bortle Dark-Sky Scale: 8.00
Mean SQM: 18.50
Astrometry.net job: 1769090
RA center: 323.072 degrees
DEC center: 48.359 degrees
Pixel scale: 1.435 arcsec/pixel
Orientation: 359.945 degrees
Field radius: 0.854 degrees
Locations: The Hills Observatory, Manchester, United Kingdom
The first image is how you would normally see the cluster in RGB
The second is with an extra 17 x 600s bin2x2 exposures added.
As far as I know this could be the first time M39 has been shown against a backdrop of Ha nebulosity. The Ha is pretty faint and has to be pushed a bit to get it out of the noise.
The image started out as a quick image in RGB taken in less than 90 mins, very quick for me and I wanted to demonstrate that you don't have to take long exposures to get some great looking images.
When I was processing the image I could see that there are areas of dust and I took it further to try and show this better. I tried a Ha filter which seemed to work, so took some more.
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