IC 2391

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IC 2391
Observation data (J2000.0 epoch)
Constellation Vela
Right ascension 08h 40.6m
Declination −53° 02′
Distance (175 pc)
Apparent magnitude (V) 2.5
Apparent dimensions (V) 50′
Physical characteristics
Other designations C 0838-528, Caldwell 85
See also: Open cluster, List of open clusters

IC 2391 (also known as the Omicron Velorum Cluster) is an open cluster in the constellation Vela. The Persian astronomer Al Sufi may have first described it about 964. It was found by Abbe Lacaille and cataloged as Lac II 5.

The cluster is about 500 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. The cluster appears to be about the same age as the open cluster IC 2602,[1] and has a lithium depletion boundary age of about 50 million years.[2]

See also[edit]


  1. ^ Stauffer, J.R.; et al. (1997). "Rotational Velocities and Chromospheric/Coronal Activity of Low-Mass Stars in the Young Open Clusters IC 2391 and IC 2602". Astrophysical Journal. 479 (2): 776. Bibcode:1997ApJ...479..776S. doi:10.1086/303930. 
  2. ^ Barrado y Navascues, D., Stauffer, J.R., & Jayawardhana, R. (2004). "Spectroscopy of Very Low Mass Stars and Brown Dwarfs in IC 2391: Lithium Depletion and Hα Emission". Astrophysical Journal. 614 (1): 386–397. Bibcode:2004ApJ...614..386B. arXiv:astro-ph/0406436Freely accessible. doi:10.1086/423485. 

External links[edit]

Coordinates: Sky map 08h 40m 18s, −52° 54′ 60″