47 Tucanae (NGC104) globular cluster

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47 Tucanae (aka NGC 104) is the second largest globular cluster of the sky, second only to Omega Centauri. It lies in the sky very near to the Small Magellanic Cloud, but is much nearer. For a comparison with other great clusters, see here.

Here is a 63% cropped view.

Technical data
Optics Takahashi FS152 apo refractor
Focal Length 1216 mm (direct focus, no flattener)
Focal Ratio f/8
Exposure Time 49 min (4x10 min + 9x1 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Tivoli Farm (Namibia) at 1350 m height
25 August 2011
Mount Fornax 51
Tracking SXV-H5 on a Vixen 80/640 apo refractor
Temperature and humidity T= +0°C, RH=62%
Sky brightness at zenith (with SQM-L) 21.5 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.

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