Messier 101 "Pinwheel" Galaxy in Ursa Major
This is one of so-called "grand-design spiral galaxies" with well-defined spiral arms. The galaxy is located at a distance of about 20 million light years, it is somewhat bigger than our Milky Way. An estimated number of stars it M101 is about 1 trillion.
Two dwarf galaxies are also seen in the photo: NGC 5474 in the upper-left corner and quite dimmed NGC 5477 to the upper-right from the M101 (see an annotated picture beneath). They are both gravitationally-bound satellites of Pinwheel.
The image was obtained using Canon EOS 600D camera with EF-S f/4-5.6 55-250mm II IS lens @250mm and f/6.4. The camera was fixed on an EQ5 motorized mount.
52 individual frames (60sec each) were calibrated and stacked using IRIS (13 offsets, 13 darks, and 13 flats were used). FITSwork4 and RawTherapee were also used. The image is cropped.
Annotated image by nova.astrometry.net:
Size: 1.19 x 0.78 degree
This is one of so-called "grand-design spiral galaxies" with well-defined spiral arms. The galaxy is located at a distance of about 20 million light years, it is somewhat bigger than our Milky Way. An estimated number of stars it M101 is about 1 trillion.
Two dwarf galaxies are also seen in the photo: NGC 5474 in the upper-left corner and quite dimmed NGC 5477 to the upper-right from the M101 (see an annotated picture beneath). They are both gravitationally-bound satellites of Pinwheel.
The image was obtained using Canon EOS 600D camera with EF-S f/4-5.6 55-250mm II IS lens @250mm and f/6.4. The camera was fixed on an EQ5 motorized mount.
52 individual frames (60sec each) were calibrated and stacked using IRIS (13 offsets, 13 darks, and 13 flats were used). FITSwork4 and RawTherapee were also used. The image is cropped.
Annotated image by nova.astrometry.net:
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