Sh2-33 in Serpens

Click on the image for a high res version.
This faint nebula is a mix between a dust and an emission nebula. Two catalogue number has been provided: Sh2-33 and LBN 37. The position in the sky is between Ophiucus and Serpens (Cauda), 4° North-West of Yed Prior (Delta Oph, mag. 2,7). Because of the clouds in the second night of imaging, I was able to capture only 4.5 hours of exposure, too few for such a faint object.

Technical Data
Optics TEC 140
Focal Length
 1011 mm
Focal Ratio f/7.2
Exposure Time Total 4 h 30 min, LRGB 120:50:40:60 min (single exp of 10 min)
CCD SBIG STL-11000M @-30°C
Location Bogli (PC, Italian Apennines) at 1350 m height
Date
 7-8 June 2013 (two nights, but the second one only of a few hours due to incoming clouds)
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +9 °C, RH=90%
Sky brightness at zenith (with SQM-L) 21.1 mag/arcsec^2
Notes North at right.

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