Barnard 138

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The Milky Way contains really a multitude of stars. But in some places a dust nebula absorbs the light of the stars behind, like this Barnard 138 nebula. This field is between Lambda and Delta Aquilae. North at right.

Technical Data
Optics Pentax 75 apo refractor
Focal Lenght 500 mm
Focal Ratio f/6.7
Exposure Time 1h30m (single exp of 10 min)
CCD Canon EOS 5D with baader filter
Sensitivity 800 ISO
Location Colle del Nivolet (AO, Italian Alps) at 2530 m height
3 July 2011
Mount Gemini G-41
Tracking Lodestar at 100 mm focal lenght
Temperature and humidity T= +5°C, RH=33%
Sky brightness at zenith (with SQM-L) 21.6 mag/arcsec^2
Notes Very good sky, transparent and clear. Unfortunately in the middle of the night, veils ruined the show. North at right.

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