M31, Andromeda Galaxy
Exposure time: 6 hours, 5 minutes, L:R:G:B = 160:70:70:65 minutes (10 min. L and 5 min. RGB subs) | Optics: Takahashi FSQ-106ED f/3.6 | Camera: SBIG ST-8300 | Mount: Astro-Physics Mach1 GTO | SQM: 21.4 magnitude/arcsec² | Location: Étoile-Saint-Cyrice, Hautes-Alpes, France | Date: August 27, 2011.