Witch Head Nebula, IC 2118

Mouse over for the main objects. Click for the high res version.

This very faint nebula is yellow-blue coloured by the light of the star Rigel, 2,5° at left (out of this image). This image tryes to reproduce accurately the true colors.

Technical Data
Optics Pentax 75
Focal Lenght 500 mm
Focal Ratio f/6.7
Exposure Time 1h (single exp of 10 min)
CCD Canon EOS 5D with baader filter
Sensitivity 800 ISO
Location Capanne di Cosola (AL, Italian Appennines), at 1500 m height
25 Feb 2011
Mount Gemini G-41
Tracking Lodestar with a small lens of 100 mm focal length
Temperature and humidity T= - 4 °C, RH=60%
Sky brightness at zenith (with SQM-L) 21.2 mag/arcsec^2
Notes North at top.

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