NGC 6752 globular cluster

Click for hires

NGC6722 is a great globular cluster that is not visible from the Northern Hemisphere because of the declination 60°S. It is even brighter and larger respect to the Northern reference, M13, the Hercules globular cluster. 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 27 min (8x10 min + 7x1 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Tivoli Farm (Namibia) at 1350 m height
31 August 2011
Mount Fornax 51
Tracking SXV-H5 on a Vixen 80/640 apo refractor
Temperature and humidity T= +8°C, RH=26%
Sky brightness at zenith (with SQM-L) 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.

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