Rho Centauri

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Rho Centauri
Diagram showing star positions and boundaries of the Centaurusconstellation and its surroundings
Cercle rouge 100%.svg

Location of ρ Centauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 12h 11m 39.11770s[1]
Declination −52° 22′ 06.4432″[1]
Apparent magnitude (V) +3.96[2]
Spectral type B3 V[2]
U−B color index −0.62
B−V color index −0.15
Radial velocity (Rv) +15 km/s
Proper motion (μ) RA: −34.92[1] mas/yr
Dec.: −16.81[1] mas/yr
Parallax (π) 8.61 ± 0.76[1] mas
Distance 380 ± 30 ly
(120 ± 10 pc)
Absolute magnitude (MV) −0.6[2]
Mass 6.6 ± 0.1[3] M
Luminosity 500[2] L
Surface gravity (log g) 4.22[2] cgs
Temperature 16,200[2] K
Age 23.7 ± 1.4[3] Myr
Other designations
CD−51°6455, HD 105937, HIP 59449, HR 4638, SAO 239737.
Database references

Rho Centauri (ρ Cen, ρ Centauri) is a star in the southern constellation of Centaurus. ρ Centauri is a blue-white B-type main sequence dwarf with an apparent magnitude of +3.98. It is approximately 380 light years from Earth.

This star is a proper motion member of the Lower-Centaurus Crux sub-group in the Scorpius-Centaurus OB association, the nearest such association of co-moving massive stars to the Sun.[2]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752free to read, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 
  2. ^ a b c d e f g de Geus, E. J.; de Zeeuw, P. T.; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics, 216 (1-2): 44–61, Bibcode:1989A&A...216...44D 
  3. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883free to read, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x