G Centauri

This article is about G Centauri. For g Centauri, see 2 Centauri.

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]

G Centauri

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]