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Tuesday 7 August 2018
NGC6820 and NGC6823
NGC6820 lies near the star cluster NGC2023 in the constellation of Vulpecula at a distance of about 6,000 light years. I took this image under very clear sky conditions with stars visable down to magnitude five. I was using my ten inch F4.8 reflector, a Vixen Atlux mount, PHD auto guiding and an Atik 383L mono CCD camera. The total exposure times were sixty minutes for each narrowband filter and thirty minutes for each RGB filter. I captured five-minute sub frames and matching dark frames and combined them with flat field frames to reduce the effect of vignetting in the final image.
