Propeller Nebula

Click on the image for a color high res version, or here for a BW H-alpha version - mouse over for H-alpha only.
Only 3.5° North of Gamma Cyg lies this particular nebula, resembling a propeller (airplane helix). The region is filled with H-alpha emission and the brigtest part is catalogued as LBN 278. This image is a composition of narrowband H-alpha images and RGB colors.

Technical Data
Optics TEC 140
Focal Length
 1011 mm
Focal Ratio f/7.2
Exposure Time 8 h 0 min (single exp of 10 min), Ha-RGB 190:80:80:130 min
CCD SBIG STL-11000M @-25°C
Location Colle dell'Agnello (CN, Italian Alps) at 2700 m height
Date
 3-4 August 2013 (two nights)
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +13 °C, RH=40%
Sky brightness at zenith (with SQM-L) 21.5-21.6 mag/arcsec^2
Notes North at top-right.

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