IC 2391
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 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.
| 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 |
It is centred about 490 light-years away from Earth and can be seen with the naked eye. It contains about 30 stars with a total visual magnitude of 2.5, spread out along 50 arcminutes.
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