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Crescent Nebula: This faint nebula is part of the rich Cygnus Milky Way with so many exciting objects. For some time it was not quite certain what the origin of this small nebula is: Super Nova remnant or Planetary Nebula. Now it seems to be clear that it is a Wolf-Rayet Nebula, meaning that an extremely bright star with a Helium core creates the emission with its very intensive radiation and star winds.In any way it is a rewarding object to photograph in this star-rich part of Cygnus.

Object Crescent Nebula
Category Nebulae
Designation NGC 6888
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, 2 x20min (1x1 bin) Baader [OIII]-filter, 5x2min (2x2 bin) each Astrodon True Balance RGB filterset. Maxim DL for image acquisition.
Calibration Dark Frame
Guiding Selfguiding
Processing Maxim DL5, Photoshop. Color Code L:H-alpha,R:H-alpha/R,G:[OIII]/G,B
Location-Date Eningen, Germany - 2 June, 21 July, 26 Sep 2009
Remark Rob Gendler´s channel blend technique
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