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Click for hires
This
great galaxy is hardly visible from Italy while grazing the South
horizon, and when I've observer high in the sky with a 50 cm Dob, I've
finally seen what a treasure is. Unfortunately for it, in the same
constellation (Sculptor) another greater galaxy is present (NGC253) and
so it is often forgotten. In this photo I've tried to extract the
external fain parts, even if the short exposure has a lot of noise.
Zoom at 66% resolution.
Zoom at 66% resolution.
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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 30 min (9x10 min) |
| CCD | Canon
EOS 5D with Baader filter |
| Sensitivity | 800 ISO |
| Location | Tivoli Farm
(Namibia) at 1350 m height |
| Date |
29 August 2011 |
| Mount | Fornax 51 |
| Tracking | SXV-H5 on a Vixen 80/640 apo refractor |
| Temperature and humidity | T= +10°C, RH=40% |
| Sky brightness at zenith (with SQM-L) | 22.1 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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