Sh2 -112 is an emission nebula in the constellation Cygnus. It is located in the northern part of the constellation, about 1.5 ° to WNW of the bright star Deneb. It is a circular H II region of apparent dimensions of about 15 ', crossed by a dark band on its western side oriented north-south. The star responsible for its excitation is believed to be BD + 45 3216, a double blue star of spectral class O8V and an apparent magnitude of 9.18. Estimates on the distance of this star provide a value of 1740 parsecs (about 5670 light years ), which would place Sh2-112 in a particularly rich region of the Orion Arm and physically very close to the great nebulous system of Cygnus X. The nebula is located in a star- forming region which also includes some sources of radio waves and the molecular cloud [DBY94] 29, which has a mass of 1880 M ⊙ ; however in a 1994 study a distance of 2100 parsecs is reported for this last cloud.
Camera: Apogee U16M (16803) w Astrodon Gen II filters
Scope: Planewave 12.5" CDK
RGB 15/18/15 x 10 minutes
H-Alpha / OIII 14 / 18 x 20 min
Paramount ME guided with an ST402ME and Astrodon MMOAG