Tag: M101

M101 Pinwheel Galaxy

Messier 101 is a beautiful spiral galaxy, which can be located in constellation Ursa Major. If I look back to my older picture, I must smile, how I overdone the saturation and whole post-processing. Such beautiful galaxy deserves to be re-captured and processed again:

Technical details:

TelescopeNewton 254/1000 mm
Aperture254 mm
Focal length1060 mm
MountGemini G53f
AutoguidingZWO 174MM, TS 60/240 mm
CameraZWO 071 Pro @-10°C
CorrectorExplore Scientific HR coma corrector
FiltersAstronomik L-1 - UV IR Block Filter
Exposure31x300s, Gain 94, bin 1x1,

M101 – Pinwheel Galaxy

Pinwheel Galaxy is similar to our own homeland Milky Way Galaxy. It has 170 000 light years in diameter (it takes 170 000 years till the light from one side reaches the other) It’s 21 million light years from Solar system and located in constellation Ursa Major (Big Dipper or Great Bear).

This galaxy is characterized by high population of H II regions and therefore I adjusted the image acquisition in the way to highlight it. In total I used four nights to capture this image. The Moon was not bothering and surprisingly, the weather was excellent in first half of May.  The first night I used just for luminance channel, second and third one for RGB channels and finally the last one for narrow band image of hydrogen alpha. Ha channel was merged with R channel and therefore the intensity of H II regions was increased. It’s probably my longest total integration time of any galaxy and it was worth it. See for yourself: