Omicron2 Centauri

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For other star systems with this Bayer designation, see Omicron Centauri.
ο2 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 11h 31m 48.80s[1]
Declination −59° 30′ 56.3″[1]
Apparent magnitude (V) +5.12
Spectral type A2Ia
U−B color index −0.11
B−V color index +0.49
Variable type α Cyg
Radial velocity (Rv) −17 km/s
Proper motion (μ) RA: -6.89 ± 0.26[1] mas/yr
Dec.: 1.12 ± 0.24[1] mas/yr
Parallax (π) 0.61 ± 0.28[1] mas
Distance approx. 5,000 ly
(approx. 1,600 pc)
Absolute magnitude (MV) −4.96
Other designations
HR 4442, HD 100262, CP−58°3693, FK5 2920, HIP 56250, SAO 239146, GC 15820
Database references

Omicron2 Centauri (ο2 Cen, ο2 Centauri) is a star in the constellation Centaurus.

ο2 Centauri is a white A-type supergiant with a mean apparent magnitude of +5.12. It is approximately 5000 light years from Earth. It is classified as an Alpha Cygni type variable star and its brightness varies from magnitude +5.12 to +5.22 with a period of 46.3 days.


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry