Object: Constellation: Coordinates: Size: Brightness:
IC 5146 Cygnus 21h53m / +4716' 12' 7.2mag (open star cluster)

The reflection and emission nebula IC 5146 (Cocoon nebula, Caldwell 19) in the constellation of Cygnus on October 18 / 19, 2017. IC 5146 is 3300 light-years from Earth and measures 15 light-years in diameter. Embedded in the nebula is a small open cluster known as Collinder 470. The stars formed a few hundred thousand years ago and illuminate the nebula. As seen from Earth, IC 5146 is situated at the end of a long dark lane called Barnard 168, a dark nebula. Unfortunately, my image doesn't show it well. IC 5146 was independently discovered by both American astronomer Edward Barnard in 1893 and German astronomer Max Wolf in 1894 (source: Wikipedia).

Thirty-eight exposures of 3 minutes at ISO 800 were stacked with no dark frame subtraction with Deep Sky Stacker (resulting in a 1 h 54 min exposure) and further processed in Photoshop.
Equipment: Canon EOS 450D Baader modified camera, TeleVue Paracorr Type II coma corrector, 16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Lacerta off axis system (field of view comparison: image of the moon with the same equipment).

Search chart for IC 5146. Map © 2017 "The Mag-7 Star Atlas Project", www.siaris.net. Map is modified.
The Mag-7 Star Atlas Project map can be downloaded here .