IC 2391
| IC 2391 | |
|---|---|
| Observation data (J2000.0 epoch) | |
| Right ascension | 08h 40.6m |
| Declination | −53° 02′ |
| Distance | 574 ly (176 pc) |
| Apparent magnitude (V) | 2.5 |
| Apparent dimensions (V) | 50′ |
| Physical characteristics | |
| Other designations | Caldwell 85, Cr 191, C 0838-528, Lac II 5 |
| Associations | |
| Constellation | Vela |
IC 2391 (also known as the Omicron Velorum Cluster or Caldwell 85) is an open cluster in the constellation Vela consisting of hot, young, blueish stars, some of which are binaries and one of which is a quadruple. Persian astronomer A. a.-R. 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.