IC 5146 Cocoon Nebula

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Technical Data
Optics Newton 200 mm (homemade by L. Comolli, F. Riccio and P. Battaglia)
Focal Lenght 1260 mm
Focal Ratio f/6
Corrector Baader MPCC
Exposure Time 1h30m (single exp of 10 min)
CCD Canon EOS 5D with baader filter
Sensitivity 800 ISO
Location Colle del Nivolet (AO, Italian Alps) at 2530 m height
Date
1 and 2 July 2011
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +1°C, RH=50%
Sky brightness at zenith (with SQM-L) 21.5 mag/arcsec^2
Notes Very good sky, transparent and clear, but bad seeing. I got guiding problems, so the total exposure is limited.


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