M36-M38 open clusters in Auriga

Click on the image for the higher res version.

Technical Data
Optics Pentax 75
Focal Lenght 500 mm
Focal Ratio f/6.7
Exposure Time 1 h (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= +5 °C, RH=36%
Sky brightness at zenith (with SQM-L) 20.7 mag/arcsec^2
Notes The sky was strangely bright, maybe due to the very clear sky also over the polluted pianura Padana at north.
Diffraction spikes obtained with two rubber bands in front of the objective.

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