G Centauri
Star in the constellation Centaurus
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G Centauri is a single[10] star in the southern constellation of Centaurus. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of +4.82. This object is located approximately 450 light years from the Sun, based on parallax.[2] It is a member of the Lower Centaurus–Crux group of the Scorpius–Centaurus association, with the former having an age of about 17 million years.[11]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 12h 26m 31.75955s[2] |
| Declination | −51° 27′ 02.2899″[2] |
| Apparent magnitude (V) | 4.82[1] |
| Characteristics | |
| Spectral type | B3V(n)[3] |
| B−V color index | −0.141±0.002[1] |
| Astrometry | |
| Radial velocity (Rv) | +5.0±4.2[1] km/s |
| Proper motion (μ) | RA: −30.66[2] mas/yr Dec.: −10.13[2] mas/yr |
| Parallax (π) | 7.28±0.24 mas[2] |
| Distance | 450 ± 10 ly (137 ± 5 pc) |
| Absolute magnitude (MV) | −0.87[1] |
| Details | |
| Mass | 6.2±0.1[4] M☉ |
| Radius | 3.42[5] R☉ |
| Luminosity | 483.06[1] L☉ |
| Temperature | 13,732[6] K |
| Metallicity [Fe/H] | −0.38±0.06[7] dex |
| Rotational velocity (v sin i) | 298±12[8] km/s |
| Age | 15.8±0.2[4] Myr |
| Other designations | |
| G Cen, CD−50°6975, GC 16954, HD 108257, HIP 60710, HR 4732, SAO 239948, CCDM J12265-5127[9] | |
| Database references | |
| SIMBAD | data |
This object is a B-type main-sequence star with a stellar classification of B3V(n),[3] where the 'n' indicates "nebulous" (broad) lines due to rapid rotation. It is around 16[4] million years old with a projected rotational velocity of up to 298 km/s.[8] The star has six[4] times the mass of the Sun and 3.4[5] times the Sun's radius. It is radiating 483[1] times the luminosity of the Sun from its photosphere at an effective temperature of 13,732 K.[6] An infrared excess indicates a circumstellar disk of dust with a mean temperature of 50 K is orbiting the star at a separation of 717.8 AU.[5]