2 Centauri
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File:V806CenLightCurve.png A light curve for V806 Centauri. The main plot shows the long term variability from Hipparcos data,[1] and the inset plot shows the variability over the 26.5 day period, using data from Tabur et 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 | Template:RA[3] |
| Declination | Template:DEC[3] |
| Apparent magnitude (V) | 4.19[4] (4.16–4.26)[5] |
| Characteristics | |
| Spectral type | M5 III[6] |
| U−B Template:Engvar | +1.44[7] |
| B−V Template:Engvar | +1.49[7] |
| Variable type | SRb[5] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[8] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[3] mas/yr Dec.: Script error: No such module "val".[3] mas/yr |
| Parallax (π) | 17.82±0.21 mas[3] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.51[9] |
| Details | |
| Radius | 82.4[10] Template:Solar radius |
| Luminosity | 71.96[4] Template:Solar luminosity |
| Temperature | 3,398[11] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[12] | |
| Database references | |
| SIMBAD | data |
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2 Centauri is a single[13] star in the southern constellation of Centaurus, 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] In 1951, Alan William James Cousins announced that the star, then called g Centauri, is a variable star.[15] It was given its variable star designation, V806 Centauri, in 1978.[16] 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.[17] The star has around 70[18] times the Sun's radius and is radiating 72[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of Script error: No such module "val"..[11]
References
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