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Bubble Nebula: The socalled Bubble Nebula complex in the center of this image is part of a huge molecular cloud and HII region (ionized hydrogen). The red glowing gas covers major parts of the image. The Open Cluster at the top is well known M52, a dense beautiful association of young stars.
The brighter spot to the right is also an emission nebula called NGC 7538.

The actual round bubble is generated by a massive  bright and hot star and its fierce star winds. The diameter of the bubble is 10 LY and lies 11000 LY away.



Object Bubble Nebula and neighbours
Category Nebulae
Designation NGC 7635
Constellation Cassiopeia
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 20min (1x1 bin) Baader H-alpha filter, 6x5min (1x1 bin) each Astrodon True Balance RGB filterset.Maxim DL for image acquisition
Calibration Dark and Flat Frame
Guiding Meade DSI Pro II and TMB 80 as Guide Scope, Maxim DL as guiding software
Processing Maxim DL5, Photoshop. Color Code L:H-alpha,R:H-alpha/R,G,B
Location-Date Eningen, Germany - 20 Aug 2009
Remark Rob Gendler´s H-alpha/R channel blend technique
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