IC 2391
Open star cluster in the constellation Vela / From Wikipedia, the free encyclopedia
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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.[2][3] It was re-found by Abbe Lacaille and cataloged as Lac II 5.
Quick Facts Observation data (J2000.0 epoch), Right ascension ...
IC 2391 | |
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Observation data (J2000.0 epoch) | |
Right ascension | 08h 40.6m |
Declination | −53° 02′ |
Distance | 574 ly (176 pc[1]) |
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 |
See also: Open cluster, List of open clusters |
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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.