Omicron¹ Centauri

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	11h31m46.1s
Declination	−59°26′32″
Apparent magnitude (V)	+5.07
Characteristics
Spectral type	G30-Ia
U−B color index	+0.78
B−V color index	+1.08
Variable type	semiregular
Astrometry
Radial velocity (Rv)	−20 km/s
Proper motion (μ)	RA: −4.08 mas/yr Dec.: 1.14 mas/yr
Parallax (π)	1.01 ± 0.58 mas
Distance	3200 ± 1900 ly (990 ± 570 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
SIMBAD	data

Omicron¹ Centauri (ο¹ Cen, ο¹ Centauri) is a star in the constellation Centaurus. It is approximately 3200 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.