HD 100673
Star in the constellation Centaurus
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HD 100673, also known as A Centauri is a single[11] 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.[1] The star is located at a distance of approximately 430 light-years from the Sun based on stellar parallax.[2] It appears to be drifting further away with a radial velocity of around +6 km/s.[1]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 11h 34m 45.66s[2] |
| Declination | −54° 15′ 50.7″[2] |
| Apparent magnitude (V) | +4.62[1] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | B9V[4] |
| U−B color index | −0.21[5] |
| B−V color index | −0.08[5] |
| Astrometry | |
| Radial velocity (Rv) | +5.7±2.2[1] km/s |
| Proper motion (μ) | RA: −56.17±0.18[2] mas/yr Dec.: 16.19±0.20[2] mas/yr |
| Parallax (π) | 7.65±0.22 mas[2] |
| Distance | 430 ± 10 ly (131 ± 4 pc) |
| Absolute magnitude (MV) | −0.96[1] |
| Details | |
| Mass | 3.58±0.05[3] M☉ |
| Radius | 4.7[6] R☉ |
| Luminosity | 306[3] L☉ |
| Surface gravity (log g) | 3.54[6] cgs |
| Temperature | 10,600[3] K |
| Metallicity [Fe/H] | 0.50[7] dex |
| Rotation | 0.733[8] days |
| Rotational velocity (v sin i) | 160[3] km/s |
| Age | 238[9] Myr |
| Other designations | |
| A Cen, CPD−53°4637, FK5 2926, GC 15877, HD 100673, HIP 56480, HR 4460, SAO 239189[10] | |
| 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.[12] It is a B-type main-sequence star with a stellar classification of B9V.[4]