Sharpless 188 (LBN 633, PN G128.0-04.1, Simeis 22 and others) is another faint planetary nebula located approximately 3,600 (http://simbad.u-strasbg.fr/simbad/sim-ref?bibcode=2011ApJ...743..138G) light-years away in Cassiopeia.
Ha – 24x1800s – 720 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
840 minutes total exposure – 14 hours
Imaged October 2nd, 3rd, 6th and 14th, 2017 at Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.
HaRGB - https://www.flickr.com/photos/dcrowson/43210873475/sizes/l