Lorenzo Comolli's Astronomy HomePage

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
Date	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	.