NGC 6188 in Ara

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This emission nebula in Ara is not very far from Scorpion, being only 3° South of the border. The nebula is excited by the open cluster NGC 6193, that is the core of the Ara OB1 stellar association.
The bright planetary nebula at bottom is GN 16.30.2, also named NGC 6164, with a striking shape.

Technical Data
Optics Pentax 75 apo refractor
Focal Length
500 mm
Focal Ratio f/6.7
Exposure Time 1 h 30 min (single exp of 10 min)
Camera Canon EOS 5D with Baader filter
Location Tivoli Farm (Namibia) at 1350 m height
30 August 2011
Mount Kenko NES
Tracking Lodestar at 100 mm focal length
Temperature and humidity T= 11 °C, RH=30%
Sky brightness at zenith (with SQM-L) 21.8 to 21.9 mag/arcsec^2
Notes This image is a collaborative effort of the Namibia 2011 expedition. Processing: Lorenzo Comolli. Images by: Lorenzo Comolli, Luigi Fontana, Giosuè Ghioldi, Emmanuele Sordini.
Very bad seeing, nearly impossible to get focus. Short exposure because of late start due to trip to the dunes for sunset.

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