The Gamma Cygni Nebula (IC 1318B) and NGC 6910
Size: about 45'
Distance: 1,550 light years (for Sadr, the bright star in the upper
RA: 20h 28m 3s
Dec: 40 degrees 00' 46"
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
area is very rich in stars, hydrogen emission, bands of opaque dust,
and the open star cluster NGC 6910 (lower left hand side of the
image). Make sure that you click on the hydrogen alpha
was used as luminance for this shot.
Date: July 16, 2004
Sky 90 at f4.5 with field flattener/focal reducer, on the G11 Losmandy
Autoguider: SBIG STV with
Ha filter (13 nm bandpass); Type II R, G, B filter set.
18 x 5' for Ha (90
minutes total, unbinned); 5 x 4' each for R, G, and B (20 minutes total
for each color), all unbinned.
Conditions: Temperature 68 degrees F; below average
transparency; humid; average seeing; calm; a few high, thin clouds
frame calibration and alignment done in ImagesPlus. Sigma
combined using RC Sigma Reject Plug-in for MaximDL. DDP
of Ha image as well as combined RGB image was performed in ImagesPlus
(IP). No gradients were
observed for the color channels since these were taken when the object
was roughly at zenith. Subsequent
levels and curves adjustments in Photoshop CS (16 bit format). Ha
was combined with RGB using the technique of Luminance
note: Graphics on this website
may not be reproduced without author permission.
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