M55

M55 (NGC 6809 and others) is a Shapley-Sawyer class IV (http://en.wikipedia.org/wiki/Shapley%E2%80%93Sawyer_Concentration_Class) globular cluster located approximately 16,300 light-years away in Sagittarius.

Luminance – 14x300s – 70 minutes – binned 1x1

Luminance – 4x600s – 40 minutes – binned 1x1

RGB – 16:14:15x300s – 80:70:75 minutes – binned 1x1

RGB – 4x600s – 40 minutes each – binned 1x1

455 minutes total exposure – 7 hours 35 minutes

Imaged over eleven nights from March through September, 2021 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/53008663132/sizes/l/

This data is from Telescope Live (https://telescope.live/) “One-click Observations.”