NGC 4147 is a Shapley-Sawyer class VI (http://en.wikipedia.org/wiki/Shapley%E2%80%93Sawyer_Concentration_Class) globular cluster located approximately 60,000 light-years away in Coma Berenices.
Luminance – 40x600s – 400 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
520 minutes total exposure – 8 hours 40 minutes
Imaged April 2nd, 4th and 23rd, 2017 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/33436814673/sizes/l
Most of the luminance was taken with the moon so I just let it click away for a couple of nights.