NGC 6820 in Vulpecula

Click on the image for a high res version. MOUSE OVER for H-alpha only. Look also to the H-alpha only hires.
NGC 6820 is an emission nebula in Vulpecula. NGC 6823 is an open cluster positioned in the center of the nebula. The most remarkable feature of the nebula is the dark finger protruding toward the center. Many other dark globules are present in the field (look high res version).

Technical Data
Optics TEC 140
Focal Length
 1011 mm
Focal Ratio f/7.2
Exposure Time Total 7 h, composed of Ha-LRGB 180:70:20:20:20 min (single exp of 30 min for Ha, 10 min for LRGB)
CCD SBIG STL-11000M @-30°C
Location Colle del Nivolet (AO, Italian Alps) at 2630 m height
Date
 10-11 July 2015
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +8 °C, RH=70 %
Sky brightness at zenith (with SQM-L) 21.3-21.5 mag/arcsec^2
Notes First night was great while imaging LRGB, but the second one was partially ruined by veils during the H-alpha imaging session.

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