M7 and dark nebulas

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M7 is an open cluster positioned in front of one of the most denser regions of the Milky Way. In the neigborhood may dark nebulas are present, such as Barnard 287 (near M7), Barnard 283 (right) and Barnard 286 (near the lower border in center).

Technical data
Optics Pentax 75 apo refractor
Focal Length 500 mm
Focal Ratio f/6.7
Exposure Time 3 h 10 min (single exp of 10 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Tivoli Farm (Namibia) at 1350 m height
2 September 2011
Mount Kenko NES
Tracking Lodestar with a small refractor (F.L. 100 mm, aperture 23 mm)
Temperature and humidity T= +5°C, RH=28%
Sky brightness at zenith (with SQM-L) 21.3-21.8 mag/arcsec^2 (Moon disturbance)
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.

HTML Editing and Publishing by Lorenzo Comolli. Email me at comolli@libero.it.
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