Hourglass nebula inside IC1318

Click on the image for a color high res version, or here for a BW H-alpha version - mouse over for H-alpha only.

This large emission nebula lies less than 2° north-west of the star Gamma Cyg. It is part of the Butterfly Nebula IC1318 around the main star, but the shape is quite different, resembling a Hourglass. In one corner lies the nice open cluster IC 1311. All the field is dotted with many Bok globules. This image is a composition of narrowband H-alpha images and RGB colors.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time 4 h 30 min (single exp of 10 min), Ha-RGB 160:60:50:60 min
CCD SBIG STL-11000M @-25°C
Location Bogli (PC, Italian Apennines) at 1350 m height
5-6-7 July 2013 (two nights)
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +14 °C, RH=90%
Sky brightness at zenith (with SQM-L) 21.1 mag/arcsec^2
Notes North at top-left.

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