Pinwheel Galaxy M101

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Pinwheel Galaxy, M101

Messier101 is a face-on galaxy in the costellation Ursa Major. It's sit about 27million light-years away from earth. It was discovered by Mechain in 1781. M101 is larger than our Milkyway galaxy. It is about twice the size of the Milkway. I took this picture with Epsilon250. I borrowed this big telescope this spring so that I can took the galaxy in wide field.

Imaging information

Optics: Takahashi Epsilon250, PentaxMS-5 Mount

Camera: SBIG STL-11000M, Astronomik LRGB filter

Exposure: Luminance=120minutes, R=20min, G=20min, B=20min

Software: Stellaimage6, PhotoshopCS

Location: Hattouji Park, Okayama Prefecture, 2008