Cat's paw, NGC 6357-6334

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Technical Data
Optics Pentax 75
Focal Lenght 500mm
Focal Ratio f/6.7
Exposure Time 40m (single exp of 10 min)
CCD Canon EOS 5D with baader filter
Location Colle dell'Agnello (CN, Italian Alps) at 2700 m height
20-21-22 Aug 2009
Mount Gemini G-41
Tracking ST4 on a 80mm f/5 refractor
Temperature and humidity T=+10°C, RH=50-70%
Sky brightness at zenith (with SQM-L) 21.5-21.8 mag/arcsec^2
Notes Imaged very low on the horizon, in mean only 8°.

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