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Berkeley 91


Dan Crowson
 

Berkeley 91 is a trumpler (https://en.wikipedia.org/wiki/Trumpler_classification) class II 2 p open cluster located approximately 7,800 light-years away in Cygnus.

 

Luminance – 24x300s – binned 1x1 – 120 minutes

RGB – 8x180s – 24 minutes each – binned 2x2

 

182 minutes total exposure – 3 hours 2 minutes

 

Imaged September 21st, 23rd and 24th, 2020 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.

 

LRGB - https://www.flickr.com/photos/dcrowson/50414030366/sizes/l/

 

Dan

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Dan Crowson                          dcrowson@...
Dardenne Prairie MO               http://www.crowson.com