Messier 93 (NGC 2447) is a 6th magnitude open cluster located approximately 3,600 light-years away in Puppis.
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
240 minutes total exposure – 4 hours
Imaged February 3rd and 4th, 2016 from Rancho Hidalgo (Animas, New Mexico) with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm.
LRGB - https://www.flickr.com/photos/dcrowson/24328142844/sizes/l