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M51 represent very well the spiral
galaxies.
We view M51 exactly from the top. To the north there is an interacting
galaxy (NGC5195) that is tearing an arm of M51.
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| Optics | 20cm Meade Schmidt-Cassegrain Telescope |
| Focal Lenght | 2000 mm |
| Focal Ratio | f/10 |
| Exposure Time and filters | L(LRGB) 200:120:30:30:45 (single exposures of 5 min) |
| CCD | FLI ME2 |
| Sensor | Kaf-402me grade 2 |
| Chip temperature | -34°C |
| Location | L:
Colle del Nivolet (AO, Parco del Gran Paradiso,
Alps) at 2600m (LRGB): Pian dell'Armà (PV, Lombard Appennines) at 1400m |
| Date and time of exposure start | L: 10
june 2005, h 21.50 TU (LRGB): 30 april 2005, h 20.30 TU |
| Mount | Gemini G41 |
| Tracking | ST4 |
| Temperature and humidity | L:
T=-1°C, RH=81% (LRGB): T=+12°C, RH=40% |
| Notes | Bad seeing |
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