Ced 51 in Orion's head

Click on the image for a high res version.

Cederblad 51 is a part of the large Sh2-264 nebula, nicknamed the "Orion's head". Meissa is at about 2.5° to the South. Three main colors are represented: red of the large H-alpha emission nebula (catalog name: GN 05.30.0), blue of the reflection nebulae (they are the Ced 51) and brown of the dust nebulae (many dark nebulae such as: LDN1574, 1577, 1580, 1581, 1597).
Total exposure is quite short due to veils and do not include a
separate H-alpha exposure, so it can be improved much. I keep in the to do list!

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time Total 2 h 40 min, LRGB 80:30:20:30 min (single exp of 10 min)
CCD SBIG STL-11000M @-40°C
Location Pian dell' Armà (PV, Italian Apennines) at 1350 m height
8 February 2013
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= -12 °C, RH=51%
Sky brightness at zenith (with SQM-L) 21.2 mag/arcsec^2
Notes South at top (for aestetic reasons).

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