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Butterfly Nebula: The most prominent constellation in the northern summer sky is Cygnus, the Swan, also called sometimes the Northern Cross. The central star of the cross is Sadr, which you see at the lower edge of the image. Around this star there is a faint, not very prominent nebulosity. The brightest parts of the nebula are called Butterfly Nebula, displayed in the center. Young hot stars have created the nebula by its very intense radiation.
On the right hand side of the image you find the Open Cluster NGC 6910.

Object Butterfly Nebula
Category Nebulae
Designation IC 1318
Constellation Cygnus
Optics Vixen R200SS 8 inch f/4.6 with Televue Paracorr SBIG
Mount Takahashi EM-11
Camera SBIG STL 11000M with internal CFW 5
Exposure 5 x 10min (1x1 bin) Baader H-alpha filter, 5x5min (2x2 bin) each Astrodon True Balance RGB filterset. Maxim DL for image acquisition.
Calibration Dark + Flat Frame
Guiding Selfguiding
Processing Maxim DL5, Photoshop. Color Code L(H-alpha), R(H-alpha/R,G,B
Location-Date Eningen, Germany - 30 May+27 July 2009
Remark Rob Gendler´s H-alpha/R channel blend technique
 
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