HD 100673
A Centauri is a single 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. The star is located at a distance of approximately 430 light-years from the Sun based on stellar parallax. It appears to be drifting further away with a radial velocity of around +6 km/s.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 11h 34m 45.66s |
| Declination | −54° 15′ 50.7″ |
| Apparent magnitude (V) | +4.62 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | B9V |
| U−B color index | −0.21 |
| B−V color index | −0.077±0.005 |
| Astrometry | |
| Radial velocity (Rv) | +5.7±2.2 km/s |
| Proper motion (μ) | RA: −56.17±0.18 mas/yr Dec.: 16.19±0.20 mas/yr |
| Parallax (π) | 7.65 ± 0.22 mas |
| Distance | 430 ± 10 ly (131 ± 4 pc) |
| Absolute magnitude (MV) | −0.96 |
| Details | |
| Mass | 3.58±0.05 M☉ |
| Radius | 2.4–3.1 R☉ |
| Luminosity | 306 L☉ |
| Temperature | 10,600 K |
| Rotational velocity (v sin i) | 160 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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. It is a B-type main-sequence star with a stellar classification of B9V.
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