LDN 673 and neighborhood

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The constellation of Aquila is filled with dark nebulas standing in front of the Milky Way. This field shows the intricate LDN 673, and many others, like LDN 682 (center-left) and LDN 684 (left); LDN676, 677, 675 and 686 are smaller and spreaded all over the image. The bright star at top-center is Omega2 Aql.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time 5 h 20 min (single exp of 10 min), L-RGB 140:50:50:80 min
CCD SBIG STL-11000M @-25°C
Location Colle dell'Agnello (CN, Italian Alps) at 2700 m height
5 August 2013
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +12 °C, RH=48%
Sky brightness at zenith (with SQM-L) 21.7 mag/arcsec^2
Notes North at left. Really dark night thanks to the clouds on the Po Valley in Piedmont.

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