|
Technical Data
|
| Optics |
Pentax 75 |
| Focal Lenght |
500 mm
|
| Focal Ratio |
f/6.7
|
| Exposure Time |
1h40m
(single
exp of 10 min)
|
| CCD |
Canon EOS 5D
with baader filter
|
| Location |
Pian
dell'Armà (PV,
Italian Appennines) at 1450 m height
|
Date
|
10 Dec 2010
|
| Mount |
Gemini G-41
|
| Tracking |
Lodestar on a
80mm
f/5 refractor
|
| Temperature
and humidity |
T= -1 °C,
RH=42%
|
| Sky brightness at zenith (with SQM-L) |
20.9 mag/arcsec^2
|
| Notes |
The sky was
strangely bright, maybe due to the very clear sky also over the
polluted pianura Padana at north.
Diffraction spikes obtained with two rubber bands in front of the
objective. |
