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sponsored by psychohistorian.org
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2011 December 13 at 10:50
Last but not least - Messier 103
NGC 581, a.k.a. Messier 103, is the last entry in Charles Messier's original list of deep sky objects. It's also the most distance open cluster in his catalogue.
It was first noted by Messier's colleague, Pierre Mechain, who picked it up on the night of March 27, 1781.
Two and a half years later, William Herschel swept it up, noting: "The compound eye glass shews a few more that may be taken into the cluster so as to make about 20. I exclude a good many straggling ones, otherwise there would be no knowing where to stop."
Some 16 million years old, NGC 581 is still a young cluster, and lies one galactic arm outward from ours, in the Perseus Arm, some 9,400 light years from Earth.
The image above, captured by Anthony Ayiomamitis, measures 45' x 30' and has north up with east to the left.
Messier 103, imaged by Anthony Ayiomamitis
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