 Alight curve for V806 Centauri. The main plot shows the long term variability fromHipparcos data,[1] and the inset plot shows the variability over the 26.5 day period, using data from Taburet al. (2009).[2] The green curve shows the best-fit sine wave, which has an amplitude of 18 millimagnitudes. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 49m 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−Bcolor index | +1.44[7] |
| B−Vcolor 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 | 82.4[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 thesouthernconstellation ofCentaurus, located approximately 183light-years fromEarth.[3] It has theBayer designationg Centauri;[12]2 Centauri is theFlamsteed designation. This object is visible to thenaked eye as faint, red-hued star with anapparent visual magnitude of 4.19.[4] It is moving away from the Earth with a heliocentricradial velocity of +41 km/s.[8] The star is a member of theHR 1614 supercluster.[14]
This is anevolvedred giant star with astellar classification of M5 III.[6] In 1951,Alan William James Cousins announced that the star, then called g Centauri, is avariable star.[15] It was given itsvariable star designation, V806 Centauri, in 1978.[16] It is classified as asemiregularvariable star and its brightness varies from magnitude +4.16 to +4.26[5] with a period of 12.57 days.[17] The star has around 70[18] times theSun's radius and is radiating 72[4] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of3,398 K.[11]
