|
Technical Data
|
| Optics |
Pentax 75 |
| Focal Lenght |
500 mm
|
| Focal Ratio |
f/6.7
|
| Exposure Time |
40 min
(single
exp of 10 min)
|
| CCD |
Canon EOS 5D
with baader filter
|
| Location |
Pian
dell'Armà (PV,
Italian Appennines) at 1450 m height
|
Date
|
11 Dec 2010
|
| Mount |
Gemini G-41
|
| Tracking |
Lodestar on a
80mm
f/5 refractor
|
| Temperature
and humidity |
T= +5 °C,
RH=39%
|
| Sky brightness at zenith (with SQM-L) |
20.7 mag/arcsec^2
|
| Notes |
A thin haze
caused the diffused light around the brightest stars. Moon above
horizon.
Diffraction spikes obtained with two rubber bands in front of the
objective. |
