| |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h49m 26.72175s[3] |
| Declination | −34° 27′ 02.7929″[3] |
| Apparent magnitude (V) | 4.19[4] (4.16–4.26)[5] |
| Characteristics | |
| Spectral type | M5 III[6] |
| U−B color index | +1.44[7] |
| B−V color index | +1.49[7] |
| Variable type | SRb[5] |
| Astrometry | |
| Radial velocity (Rv) | +40.7±0.7[8] km/s |
| Proper motion (μ) | RA: −41.68±0.23[3] mas/yr Dec.: −59.77±0.18[3] mas/yr |
| Parallax (π) | 17.82 ± 0.21 mas[3] |
| Distance | 183 ± 2 ly (56.1 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.51[9] |
| Details | |
| Radius | 70[10] R☉ |
| Luminosity | 71.96[4] L☉ |
| Temperature | 3,398[11] K |
| Other designations | |
g Centauri, 2 Cen, V806 Cen, CD−33°9358, GC 18666, HD 120323, HIP 67457, HR 5192, SAO 204875[12] | |
| Database references | |
| SIMBAD | data |
2 Centauri is a single[13] star in the southern constellationofCentaurus, located approximately 183 light-years from Earth.[3] It has the Bayer designation g Centauri;[12] 2 Centauri is the Flamsteed designation. This object is visible to the naked eye as faint, red-hued star with an apparent visual magnitude of 4.19.[4] It is moving away from the Earth with a heliocentric radial velocity of +41 km/s.[8] The star is a member of the HR 1614 supercluster.[14]
This is an evolved red giant star with a stellar classification of M5 III.[6] It is classified as a semiregular variable star and its brightness varies from magnitude +4.16 to +4.26[5] with a period of 12.57 days.[15] The star has around 70[10] times the Sun's radius and is radiating 72[4] times the Sun's luminosity from its enlarged photosphere at an effective temperatureof3,398 K.[11]
