3 Centauri

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Not to be confused with C Centauri.
3 Centauri A/B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 13h 51m 49.60s[1]
Declination −32° 59′ 38.7″[1]
Apparent magnitude (V) +4.56/+6.06
Spectral type B5IIIp/B8V
U−B color index −0.60
B−V color index −0.13
Variable type eclipsing binary?
Radial velocity (Rv) +10 km/s
Proper motion (μ) RA: -34.54 ± 0.78[1] mas/yr
Dec.: -28.21 ± 0.62[1] mas/yr
Parallax (π) 9.49 ± 0.89[1] mas
Distance 340 ± 30 ly
(105 ± 10 pc)
Absolute magnitude (MV) −0.23/+1.27
Other designations
k Centauri, V983 Centauri, HR 5210/5211, HD 120709/120710, CD−32°9676, HIP 67669, SAO 204916/204917, GC 18724/18725, CCDM J13518-3300
Database references

3 Centauri is a binary star in the constellation Centaurus. It is approximately 340 light years from Earth.

The primary component, 3 Centauri A, is a blue-white B-type giant with a mean apparent magnitude of +4.56. It is a variable star, and its brightness varies from magnitude +4.27 to +4.32 It is suspected the variations in luminosity are a result of the primary being an eclipsing binary, which would mean the system would consist of at least three objects. Its more distant companion, 3 Centauri B, is located 7.9 arcseconds away. It is a blue-white B-type main sequence dwarf and has an apparent magnitude of +6.06.


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