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| Optics | Pentax 75 |
| Focal Lenght | 500 mm |
| Focal Ratio | f/6.7 |
| Exposure Time | 1h
(single
exp of 10 min) |
| CCD | Canon EOS 5D
with baader filter |
| Sensitivity | 800 ISO |
| Location | Capanne di
Cosola (AL, Italian Appennines), at 1500 m height |
| Date |
25 Feb 2011 |
| Mount | Gemini G-41 |
| Tracking | Lodestar with
a small lens of 100 mm focal length |
| Temperature and humidity | T= - 4
°C,
RH=60% |
| Sky brightness at zenith (with SQM-L) | 21.2 mag/arcsec^2 |
| Notes | North at top. |
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