NGC 1624
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NGC 1624, also known as Sh2-212 in the Sharpless catalog, is a very young open cluster in the constellation Perseus inside an emission nebula. It was discovered by German-British astronomer William Herschel in 1790. Wikipedia
Apparent magnitude (V): 11.8
Distance: 20000 ± 2000 ly (6000 ± 600 pc)
Estimated age: <4 Myr