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Messier 101 - Pinwheel Galaxy


Messier 101 - Pinwheel Galaxy

This is the Pinwheel Galaxy (Messier 101) located ~20.9M light years from earth near the constellation Ursa Major (Big Dipper). It’s 1.7 times the size of the Milky Way and is made up of 1 trillion stars. My image was created with 155 images of 90 seconds each for a total integration of 3 hours, 52 minutes. These were taken on April 2 and April 18th. There are several (at least 5 or 6) other galaxies in the image. Look closely at about 10 o’clock and you’ll see a cool edge on galaxy called NGC 5422. There’s another fuzzy galaxy at about the 4 o’clock position called NGC 5474.

Imaging with a AT72EDii (72 mm/432 mm) with Optolong L-Pro filter, Canon T2i (EOS 550d) - unmodded
Guiding with William Optics 50 mm/200 mm guide scope, ZWO ASI120mm-S, and PHD2

April 2 - 1hr 16 min. 30 sec. @ ISO1600
51 x 90 seconds, 20 darks, 20 flats, 25 bias

April 18 - 2hr 36 min. 0 sec. @ ISO1600
104 x 90 seconds, 20 darks, 25 flats, 28 bias
Stacked in DSS, edited in Gimp

Credit to P. Coleman and S. Rifken for helping with the processing to bring out more detail and retain the color.






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