Helix nebula, NGC 7293

Click on the image for a higher res version

Helix Nebula is a very nice object in Aquarius, at declination -21°. Color contrast between center and borders is impressive. Imaging from Northern Italy requires great transparency and dark skys toward the South, like Colle dell'Agnello, at 2700 m heigth. Here below a 100% crop of the nebula.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time 3h10m (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
22 August 2012
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +13°C, RH=60%
Sky brightness at zenith (with SQM-L) 21.4-21.5 mag/arcsec^2
Notes .

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