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Click for hires
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.
Here is a 100% cropped view.
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| 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. |
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