![]() The position of Alpha Centauri A and Alpha Centauri B |
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Observation data Epoch J2000.0 Equinox J2000.0 |
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Constellation | Centaurus |
Alpha Centauri A | |
Right ascension | 14h 39m 36.4951s |
Declination | -60° 50′ 02.308″ |
Apparent magnitude (V) | −0.01 |
Alpha Centauri B | |
Right ascension | 14h 39m 35.0803s |
Declination | -60° 50′ 13.761″ |
Apparent magnitude (V) | +1.33 |
Characteristics | |
Spectral type | G2V |
U−B color index | +0.23 |
B−V color index | +0.69 |
Characteristics | |
Spectral type | K1V |
U−B color index | +0.63 |
B−V color index | +0.90 |
Astrometry | |
Radial velocity (Rv) | −21.6 km/s |
Proper motion (μ) | RA: −3678.19 mas/yr Dec.: 481.84 mas/yr |
Parallax (π) | 747.1 ± 1.2mas |
Distance | 4.366 ± 0.007 ly (1.339 ± 0.002 pc) |
Absolute magnitude (MV) | 4.38 / 5.71 |
Details | |
Alpha Centauri A | |
Mass | 1.100M☉ |
Radius | 1.227R☉ |
Luminosity | 1.519L☉ |
Surface gravity (log g) | 4.30 |
Temperature | 5790K |
Metallicity | 151% Sun |
Rotation | 22 days |
Age | 4.85×10 years |
Alpha Centauri B | |
Mass | 0.907M☉ |
Radius | 0.865R☉ |
Luminosity | 0.500L☉ |
Surface gravity (log g) | 4.37 |
Temperature | 5260K |
Metallicity | 160% Sun |
Rotation | 41 days |
Age | 4.85×10 years |
Orbit | |
Companion | Alpha Centauri AB |
Period (P) | 79.91 ± 0.011 yr |
Semimajor axis (a) | 17.57 ± 0.022" |
Eccentricity (e) | 0.5179 ± 0.00076 |
Inclination (i) | 79.205 ± 0.041° |
Longitude of the node (Ω) | 204.85 ± 0.084° |
Periastron epoch (T) | 1875.66 ± 0.012 |
Argument of periastron (ω) (secondary) |
231.65 ± 0.076° |
Other designations | |
Rigil Kentaurus, Rigil Kent, Toliman, Bungula, FK5 538, CP(D)−60°5483, GC 19728, CCDM J14396-6050
α Cen A α1 Centauri, GJ 559 A, HR 5459, HD 128620, GCTP 3309.00, LHS 50, SAO 252838, HIP 71683 α Cen B α2 Centauri, GJ 559 B, HR 5460, HD 128621, LHS 51, HIP 71681 α Cen C (= Proxima Cen) LHS 49, HIP 70890 |
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Database references | |
SIMBAD | data |
ARICNS | data |