IC 443, Jellyfish Nebula

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IC 443, aka Jellyfish Nebula, is a supernova remnant, much like the Veil nebula in Cygnus. This field is in Gemini, and the brightest star is Eta Gem. The blue nebula near the upper edge is IC 444. The next crop show the IC 443 central part.
Technical Data
Optics TEC 140
Focal Length
 1011 mm
Focal Ratio f/7.2
Exposure Time 3h30m (single exp of 10 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Bogli (PC, Italian Apennines) at 1350 m height
Date
 29 December 2011
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= -4°C, RH=89%
Sky brightness at zenith (with SQM-L) 21.5 mag/arcsec^2
Notes Low noise thanks to a dark sky and cold temperatures.

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