Mel 20 Mirfak cluster

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Technical Data
Optics Pentax 75
Focal Lenght 500 mm
Focal Ratio f/6.7
Exposure Time 40 min (single exp of 10 min)
CCD Canon EOS 5D with baader filter
Location Pian dell'Armà (PV, Italian Appennines) at 1450 m height
11 Dec 2010
Mount Gemini G-41
Tracking Lodestar on a 80mm f/5 refractor
Temperature and humidity T= +3 °C, RH=40%
Sky brightness at zenith (with SQM-L) 20.6 mag/arcsec^2
Notes Moon above horizon.
Diffraction spikes obtained with two rubber bands in front of the objective.

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