IC 2391

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

IC 2391 (also known as the Omicron Velorum Cluster or Caldwell 85) 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. It includes the following naked-eye members:[1]

  • ο Velorum
  • HD 74560 (HY Velorum)
  • HD 74146 (NZ Velorum)
  • HD 74071 (HW Velorum)
  • HD 74196
  • HD 74535 (KT Velorum)
  • HD 75466
  • HD 73952

IC 2391 appears to be about the same age as the open cluster IC 2602,[2] and has a lithium depletion boundary age of about 50 million years.[3] IC 2391 has been closely linked to the Argus Association of co-moving stars. Proposed members of this moving group include Denebola, Epsilon Pavonis, 49 Ceti, HD 61005, and HD 88955.[4]

See also

References

  1. ↑ Platais, I; Melo, C; Mermilliod, J. -C; Kozhurina-Platais, V; Fulbright, J. P; Méndez, R. A; Altmann, M; Sperauskas, J (2007). "WIYN open cluster study. XXVI. Improved kinematic membership and spectroscopy of IC 2391". Astronomy and Astrophysics. 461 (2): 509. arXiv:astro-ph/0611584. Bibcode:2007A&A...461..509P. doi:10.1051/0004-6361:20065756.
  2. ↑ 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): 776–791. Bibcode:1997ApJ...479..776S. doi:10.1086/303930.
  3. ↑ 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. arXiv:astro-ph/0406436. Bibcode:2004ApJ...614..386B. doi:10.1086/423485.
  4. ↑ Malo, Lison; et al. (January 2013), "Bayesian Analysis to Identify New Star Candidates in Nearby Young Stellar Kinematic Groups", The Astrophysical Journal, 762 (2): 50, arXiv:1209.2077, Bibcode:2013ApJ...762...88M, doi:10.1088/0004-637X/762/2/88, 88.
  • Frommert, Harmut (29 March 1998). "Omicron Velorum (IC 2391)". SEDS Messier Database. Students for the Exploration and Development of Space.
  • IC 2391 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
  • "IC 2391". SIMBAD. Centre de données astronomiques de Strasbourg.
  • "Open Cluster". An Atlas of The Universe.

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


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