Stock 4 is a class III 1 p open cluster located in Perseus. This is one of 24 open clusters compiled by Jurgen Stock in the 1950s. A full list can be found here - http://www.deepskype...wiki/List:Stock(when and if the reference comes back online).
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
240 minutes total exposure – 4 hours
Imaged from Dardenne Prairie, Missouri (a red zone) on December 8th and 9th, 2017 with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm.
LRGB - https://www.flickr.c...5528272/sizes/l
My other Stock images can be found here - https://www.flickr.c...157689344944815.