Sharpless 135 (LBN 492 and 493) is an emission nebula located approximately 6,200 light-years away in Cepheus. This is the nebula just south and east (left) of center.
LBN 491 and 489 are the two nebulae south and west (right) of center.
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 October 7th, 2016 with a SBIG ST-8300M on an Astro-Tech AT90DT at f/6.7 603mm.
LRGB - https://www.flickr.com/photos/dcrowson/30353067462/sizes/l