2 Centauri

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Template:Short description Template:About-distinguish

2 Centauri
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)Template:Val[8] km/s
Proper motion (μ) RA: Template:Val[3] mas/yr
Dec.: Template:Val[3] mas/yr
Parallax (π)17.82±0.21 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.51[9]
Details
Radius82.4[10] Template:Solar radius
Luminosity71.96[4] Template:Solar luminosity
Temperature3,398[11] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[12]
Database references
SIMBADdata

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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 Template:Val.[11]

References

Template:Reflist

Template:Stars of Centaurus

  1. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named HipDataAccess
  2. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Tabur
  3. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named van Leeuwen2007
  4. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  5. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named gcvs
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named HD
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named EgUBV
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named RV
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Cardini2005
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named McDonald2012
  12. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Simbad
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton2008
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Eggen1998
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Cousins1951
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kholopov1978
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Ruban2009
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named PasinettiFracassini2001
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