M22 globular cluster

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M22 is a large globular cluster in Sagittarius, encircled with a rich field of stars. For a comparison with other great clusters, see here.

Here is a 100% cropped view.


Technical data
Optics Takahashi FS152 apo refractor
Focal Length 1216 mm (direct focus, no flattener)
Focal Ratio f/8
Exposure Time 1 h 05 min (6x10 min + 5x1 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Tivoli Farm (Namibia) at 1350 m height
Date
2 September 2011
Mount Fornax 51
Tracking SXV-H5 on a Vixen 80/640 apo refractor
Temperature and humidity T= +7°C, RH=28%
Sky brightness at zenith (with SQM-L) 21.4 mag/arcsec^2 (Moon high in the sky)
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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