Topic summary
IC 2391
IC 2391 (also known as the Omicron Velorum Cluster or Caldwell 85) is an open cluster in the constellationVela consisting of hot, young, blueish stars, some of which are binaries and one of which is a quadruple. Persian astronomer Abd al-Rahman al-Sufi first described it as "a nebulous star" in c. 964. It was re-found by Abbe Lacaille and cataloged as Lac II 5.