Sh2
112 (Sharpless 112) Nebula in Cygnus -
H-Alpha + OIII + RGB
Click on the image to see it 2x this big (which is 50% of the full rez)
Here is the Pure RGB:
[from Wikipedia:
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
TSX and CCD-Commander
PixInsight Processing:
Ha and OIII: BlurX, NoiseX, StarX, Curves, HT; Stars stretched gently
and equally; Foraxx script to produce the NB final product
RGB: SPCC, BlurX, NoiseX, StarX, Curves, HT; Stars stretched gently;
PixelMath to recombine stars with starless RGB
Export the two final images to Photoshop
Photoshop processing: RGB final image pasted over the Foraxx final
image using Screen blend mode; High Pass Filter (masked) on the core of
the Foraxx layer; Curves and Levels adjustments to boost contrast and
tame the brightest parts. Save for Web.
Captured March/April 2022
Reprocessed July 2025
Lucknow, Ontario
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