M 51 - Whirlpool Galaxy - SCT 20cm

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.

Technical Data
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)
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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