The centre of the Galaxy region in Sagittarius and Scorpius skimming the southern horizon on June 9, 2013 from home at a latitude of +51°. M6 and M7 clusters are just on the horizon. The sky was moonless but lit with perpetual twilight. Ground illumination is from starlight. This is a single 15-second exposure at f/1.4 with the 24mm lens and Canon 60Da at ISO 1600. Taken as part of a comparison pair with a 60 second exposure.
Several types of deep-sky objects are represented here: an emission nebula, dark nebulas, and star clusters, in this rich field in Cygnus. The field frames the bright and magenta Cocoon Nebula (at lower left), aka IC 5146, at the end of the dark nebula B168, aka The Dark Cigar, which itself is southeast of the bright but sparse star cluster Messier 39 at upper right. The field is also wrapped in faint red emission nebulosity. A dimmer smaller star cluster, Platais 1, sits above M39. This is a rich field about 6° by 4°, embedded in the main band of the Milky Way in northern Cygnus. This is a blend of: a stack of 8 x 6-minute exposures at ISO 1600 through a clear Astronomik UV-IR cut filter, layered with a stack of 11 x 12-minute shots at ISO 2000 through an IDAS NB1 narrowband filter for the red H-alpha nebulosity. All were with the 76mm SharpStar apo refractor with its matching flattener/reducer for f/4.4, and with the red-sensitive Canon EOS Ra camera. Autoguiding and inter-frame dithering was with the MGEN3. No darks or LENR were applied here on this cooler autumn night. All stacking, alignment and blending with Photoshop. I brought out the faint nebulosity with the use of luminosity and color range masks created with Lumenzia and Zone System Express 7. Diffraction spikes added for artistic effect with Astronomy Tools Actions. A mild Orton glow added with Luminar AI for fun.
This area in Cygnus that contains the circular Cocoon Nebula, aka IC 5146, located at the end of the long dark nebula called the Dark Cigar but officially is Barnard 168. The nebulas are flanked by two open star clusters: NGC 7209 at far left just over the border in Lacerta, and Messier 39 at far right. NGC 7209 barely stands out amid the rich starfield here, just below an orange star, while M39 is bright but sparse at right. The clusters and dark nebula stand out well in binoculars but the Cocoon Nebula is a challenge to see in telescopes. This is a stack of 6 x 6-minute exposures with the William Optics RedCat 51mm astrographic refractor at f/5 and the Canon EOS Ra at ISO 800 with LENR on as it was the warmest night of the summer, August 18, 2020. Aligned, stacked and median combined in Photoshop to eliminate some satellite trails. Autoguided with the ZWO ASIAir and ASI120MM guide camera with the RedCat on the Astro-Physics Mach1 mount. No filters employed here.
