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Cygnus Clouds: Within the Summer Constellation of Cygnus or the Swan one of the largest regions of glowing hydrogen clouds (HII region) can be found. They are illuminated by several young bright stars and cover most of the central region of the Swan.
The wide-field image shows this exciting area. Top left are two well known objects, North America and Pelican Nebula, in the center there is the Butterfly Nebula and down right from it the small Crescent Nebula. In the lower left part of the image the Veil Nebula complex, a Super Nova Remnant, can be detected.

The image was composed from frames taken with two different narrow band filters letting pass only the H-alpha line of hydrogen and the [OIII] line of oxygen.

 



Object Cygnus Clouds
Category Nebulae
Designation H II Clouds
Constellation Cygnus
Optics Mamiya Secor C lens 80mm 1:2.8 @ f/4
Mount Takahashi EM-11
Camera SBIG STL 11000M with internal CFW 5
Exposure 6x20min H-alpha, 4x20min [OIII], 1x5min each RGB, Baader filterset. Maxim DL for image acquisition
Calibration Dark Frame
Guiding Unguided
Processing Maxim DL5,Photoshop. Color Code R:[H-alpha], G:[OIII], B:[OIII], RGB stars as overlay
Location-Date Eningen, Germany - 15 Aug 2013
 
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