Omicron1 Centauri

From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other star systems with this Bayer designation, see Omicron Centauri.
ο1 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 11h 31m 46.07s[1]
Declination −59° 26′ 31.4″[1]
Apparent magnitude (V) +5.07
Spectral type G30-Ia[clarification needed]
U−B color index +0.78
B−V color index +1.08
Variable type semiregular
Radial velocity (Rv) −20 km/s
Proper motion (μ) RA: -4.31 ± 0.28[1] mas/yr
Dec.: 1.72 ± 0.28[1] mas/yr
Parallax (π) 0.57 ± 0.32[1] mas
Distance approx. 6,000 ly
(approx. 1,800 pc)
Absolute magnitude (MV) −4.90
Other designations
HR 4441, HD 100261, CP−58°3692, HIP 56243, SAO 239145, GC 15818, CCDM J11318-5927
Database references

Omicron1 Centauri (ο1 Cen, ο1 Centauri) is a star in the constellation Centaurus. It is approximately 6000 light years from Earth.

ο1 Centauri is a yellow G-type supergiant with a mean apparent magnitude of +5.07. It is classified as a semiregular variable star and its brightness varies from magnitude +5.8 to +6.6 with a period of 200 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