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| Optics | Pentax 75 |
| Focal Lenght | 500mm |
| Focal Ratio | f/6.7 |
| Exposure Time | 4h10min
(single
exp of 10 min) |
| CCD | Canon EOS 5D
with baader filter |
| Location | Colle
dell'Agnello (CN,
Italian Alps) at 2700 m height |
| Date |
8-9 Aug 2010
(two nights) |
| Mount | Gemini G-41 |
| Tracking | ST4 on a 80mm
f/5 refractor |
| Temperature and humidity | T=+6°C,
RH=50% |
| Sky brightness at zenith (with SQM-L) | 21.50-21.85 mag/arcsec^2 |
| Notes | Strong wind
that ruined many exposures. Diffraction spikes with StarSpikes software. |
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