Cygnus Narrowband Widefield

Cygnus Widefield
All Images Copyright Steve Cannistra

Narrowband images
Please click here for a narrowband full frame, medium view (30%)
Please click here for a narrowband full frame, larger view (40%)
Please click here for a version with LABELS
Please click here for a broadband version of this field of view

Magnitude:  Not Applicable
Size: FOV of full frame image (uncropped) = 3.9 x 3.9 degrees
RA: 20h 19m 08s (J2000)
Dec: 39 degrees 40' 27" (J2000)
PA:  +270 degrees

The region around the star Sadr, also known as Gamma Cygni, is full of emission nebulosity (designated SH-108 which includes IC 1318).  IC 1318B is located within the constellation Cygnus and is close to other famous landmarks along the summer Milky Way, like the Pelican and North American Nebulae, the Crescent Nebula (upper right), and the Bubble.  This area is very rich sulfur, hydrogen, and oxygen gases which are excited by high energy stars in the region to emit in SII (around 672nm), HII (656nm), and OIII (around 495nm).  The above image represents a mapped color composite in which SII is mapped to the Red channel, HII is mapped to Green, and OIII is mapped to Blue (Hubble Palette).  More information about this region can be found at Rob Gendler's website.

Photographic Details:
Dates:  August 14, 15, 16, 2013
Scope:  Takahashi FSQ106 at f5 on the Takahashi NJP Mount
Autoguider:  SBIG ST-402 with 60mm guidescope, focal length 227mm
Camera:  Apogee U16M at -20C, with 7 position 50mm square filter wheel (Apogee FW50-7S)
Baader narrowband filters, 50mm square
Exposures:  Ha, 4 hours; OIII, 4 hours; SII, 4 hours.  Total exposure 12 hours.
Post-processing:  Calibrated, aligned, and stacked in Maxim, followed by DDP in ImagesPlus (IP).  Further processing in Photoshop CS (16 bit format) using the clipped layer mask method originally described by Travis Rector
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