Sh2-232 in Auriga

Click on the image for a high res version. MOUSE OVER for H-alpha only. Look also to the H-alpha only hires.

Sh2-232 is a large nebula in the middle of Auriga. The main object is round with a diameter of about 40', larger respect to the Moon. The smaller and brighter object in the middle is Sh2-235, the faintest and large on the right is sh2-231, while the small on the right is Sh2-233.
This image is a Ha-RGB composition, with data gathered in a single night. It definitely needed a second night to add more exposure, but weather did not collaborated.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time Total 4 h 50 min, composed of Ha-RGB 150:40:40:60 min (single exp of 30 min for Ha, 10 min for RGB)
CCD SBIG STL-11000M @-35°C
Location Pian dell'Armà (PV, Italian Apennines) at 1350 m height
5 February 2016
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= (+2 to -1) °C, RH=(60 to 80) %
Sky brightness at zenith (with SQM-L) 21.3 mag/arcsec^2
Notes .

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