Sh2-224 Supernova remnant 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.

Sh2-224 is a supernova remnant in Auriga, a very faint nebula immersed in a rich field of stars of the Milky Way. Only thanks to the H-alpha contribution I was able to evidence this nebula, that in the RGB frames was much less pronounced. Three nights of data has been collected, during two consecutive new Moons.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time Total 9 h, composed of Ha-RGB 390:40:40:70 min (single exp of 30 min for Ha, 10 min for RGB)
CCD SBIG STL-11000M @-40°C
Location Pian dell'Armà (PV, Italian Apennines) at 1350 m height
Capanne di Cosola (AL, Italian Apennines) at 1500 m height
27-28 December 2014
24 January 2015
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= -9 °C, RH=(70-90) %
T= -3 °C, RH=80 %
Sky brightness at zenith (with SQM-L) 21.2 mag/arcsec^2
21.15 mag/arcsec^2
Notes Three nights, the first two mainly focused on H-alpha imaging and with a little RGB, the latter one month later with only RGB. Unfortunately the latter was ruined by veils and so the RGB total exposure was limited.

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