Messier 37. (*)
It was discovered by Giovanni Batista Hodierna before 1654 and independently found by Le Gentil in 1749. M38 is at a distance of about 3,420 light years away from Earth.
1. ^ Majaess D., Turner D., Lane D. (2007), In Search of Possible Associations between Planetary Nebulae and Open Clusters, PASP, 119, 1349
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