M6 (NGC 6405, Collinder 341, the Butterfly Cluster and others) is a is a trumpler (https://en.wikipedia.org/wiki/Trumpler_classification) class II 3 r open cluster located approximately 1,600 light-years away in Scorpius.
Luminance – 11x600s – 110 minutes – binned 1x1
RGB – 15:13:12x600s – 150:130:120 minutes each – binned 1x1
510 minutes total exposure – 8 hours 30 minutes
Imaged eleven nights from August, 2021 through June, 2022 at the El Sauce Observatory (Rio Hurtado, Chile) with a FLI PL 9000 on a PlaneWave CDK24 at f/6.5 3974 mm.
LRGB - https://www.flickr.com/photos/dcrowson/52785973617/sizes/l/
This data is from Telescope Live (https://telescope.live/) “One-click Observations.”
See my previous refractor image here - https://www.flickr.com/photos/dcrowson/26939336543.