Barnard 169-170-171-174 in Cepheus

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In the middle of the large IC1396 nebula and Zeta Cephei, a group of Barnard nebulas lies: 169-170-171-174. The larger one os B171, here the large obscure oval from the center to the lower border. B169-170 are part of that. Instead B174 is the pitch back nebula on the upper-left corner. The faint red nebula on the left side is part of LBN 474.

Technical Data
Optics TEC 140
Focal Length
 1011 mm
Focal Ratio f/7.2
Exposure Time 2h10m (single exp of 10 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Colle dell'Agnello (CN, Italian Alps) at 2700 m height
Date
 21 August 2012
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +13°C, RH=60%
Sky brightness at zenith (with SQM-L) 21.5 mag/arcsec^2
Notes .

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