Barnard's E (B142-143)

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One of the most known and observed dark nebula is quite easy to find in the sky, at only 3° North-West of Altair (mag. 0.9, Alpha Aquilae). And with a little of commitment also a large "E" can be seen (here rotated counterclockwise). The part on the left (North) is Barnard 143 (LDN 694) while the one on the right (South) is Barnard 142 (LDN 689, 690, 688, 687).

Technical Data
Optics TEC 140
Focal Length
 1011 mm
Focal Ratio f/7.2
Exposure Time Total 3 h 40 min, LRGB 120:30:30:40 min (single exp of 10 min)
CCD SBIG STL-11000M @-35°C
Location Colle dell'Agnello (CN, Italian Alps) at 2700 m height
Date
 23 August 2014
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +1 °C, RH= 90%
Sky brightness at zenith (with SQM-L) 21.4 mag/arcsec^2
Notes North at left.

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