M66 (NGC 3627, UGC 6346, Arp 16 and many others) is an intermediate (between barred and unbarred) spiral galaxy located approximately 36 million light-years away in Leo.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged over four nights in March, 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.