Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Centaurus |
Right ascension | 11h 34m 45.66s[1] |
Declination | −54° 15′ 50.7″[1] |
Apparent magnitude (V) | +4.62[2] |
Characteristics | |
Evolutionary stage | Main sequence[3] |
Spectral type | B9V[4] |
U−B color index | −0.21 |
B−V color index | −0.077±0.005[2] |
Astrometry | |
Radial velocity (Rv) | +5.7±2.2[2] km/s |
Proper motion (μ) | RA: −56.17±0.18[1] mas/yr Dec.: 16.19±0.20[1] mas/yr |
Parallax (π) | 7.65 ± 0.22 mas[1] |
Distance | 430 ± 10 ly (131 ± 4 pc) |
Absolute magnitude (MV) | −0.96[2] |
Details | |
Mass | 3.58±0.05[3] M☉ |
Radius | 2.4–3.1[5] R☉ |
Luminosity | 306[3] L☉ |
Temperature | 10,600[3] K |
Rotational velocity (v sin i) | 160[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
A Centauri is a single[7] star in the southern constellation of Centaurus. It is blue-white in hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.62.[2] The star is located at a distance of approximately 430 light-years from the Sun based on stellar parallax.[1] It appears to be drifting further away with a radial velocity of around +6 km/s.[2]
This is a rapidly rotating Be star, showing an emission-line spectrum on top of the normal absorption spectrum of the star, due to a circumstellar disk of ejected matter. It doesn't show any absorption lines from the disk.[8] It is a B-type main-sequence star with a stellar classification of B9V.[4]