Cygnus Widefield Mosaic in Hydrogen Alpha

Gamma Cygni Nebula
All Images Copyright Steve Cannistra

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Magnitude:  ?
Size: about 45'
Distance: 1,550 light years
RA: 20h 25m 32s
Dec: 40 degrees 18' 55"

This is a mosaic of two separate images that I took in April and May of 2007.  The region around the star Sadr, also known as Gamma Cygni, is full of emission nebulosity (designated IC 1318B).  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, and the Bubble.  This area is very rich in stars, hydrogen emission, and bands of opaque dust.  Feel free to check out the links to larger versions of this image (please allow time for full download).

Photographic Details:

Date:  April 21, 2007 (right side) and May 8, 2007 (left side)
Scope:  Takahashi FSQ106 at f5 on the G11 Losmandy Mount.
Autoguider:  SBIG ST-402 with e-finder.
Camera:  STL11K -20C.

Baader 7nm Ha filter.
Exposures:  Right side:  8 x 20' unbinned; left side 5 x 20' unbinned.  Total exposure 4.4 hours.
Conditions:  Temperature 65-75 degrees F, good transparency, average seeing.  CCD was cooled to -20C on both nights.
Post-processing:  Calibrated, aligned, and Sigma Clip combined in Maxim, followed by DDP in ImagesPlus (IP).  Further processing in Photoshop CS (16 bit format).

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