IC 4604 is a large, blue reflection nebula located in Ophiuchus. The nebula is illuminated by Rho Ophiuchi, the triple star at the center of this image. This object is part of the Astronomy League Bright Nebulae Program.
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
240 minutes total exposure – 4 hours
Imaged March 28th and May 11th, 2015 at the Danville Conservation Area (New Florence, Missouri) with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm.
LRGB - https://www.flickr.com/photos/dcrowson/17504029570/sizes/l