IC 5146 Cocoon nebula and B168 dark nebula

Click on the image for a higher res version

Technical Data
Optics TEC 140
Focal Lenght 1011 mm
Focal Ratio f/7.2
Exposure Time 1h40m (single exp of 10 min)
CCD Canon EOS 5D with baader filter
Sensitivity 800 ISO
Location Colle dell'Agnello (CN, Italian Alps) at 2700 m height
Date
2 August 2011
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +8°C, RH=76%
Sky brightness at zenith (with SQM-L) 21.6 mag/arcsec^2
Notes Compare this image with the one taken a month before, with a nearly identical sky, and exactly the same setup (excluding telescope). Here is the other Cocoon.


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