(Updated Dec. 2017) This is a large region of nebulosity (mostly hydrogen) around the star Sadr in the constellation Cygnus. From Wa-chur-ed Observatory in June of 2016. As is usual for this observatory, this is a narrowband image, processed to yield a false-color image in which the yellow represents S-2 and the blue represents O-3.  Both colors are then modulated by the brightness of the H-a channel. The bright star near the center is Sadr, which is the central star in the constellation Cygnus. Scope: AT111EDT at f/5.7 Mount: AP Mach1 Camera: QSI 683 at –20C Exposure: 13 x 900 […]