1 Centauri

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Template:Short description Template:Redirect-distinguish

1 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.23[2]
Characteristics
Spectral type F2 V[3]
U−B Template:Engvar +0.00[4]
B−V Template:Engvar +0.38[4]
Astrometry
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: Template:Val[1] mas/yr
Dec.: Template:Val[1] mas/yr
Parallax (π)51.54±0.19 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+2.81[6]
Orbit[7]
Period (P)Template:Val
Eccentricity (e)Template:Val
Periastron epoch (T)2,422,737.382 ± 3.35 JD
Argument of periastron (ω)
(secondary)		Template:Val°
Semi-amplitude (K1)
(primary)		Template:Val km/s
Details
Mass1.35[6] Template:Solar mass
Luminosity (bolometric)5.857[8] Template:Solar luminosity
Surface gravity (log g)Template:Val[9] cgs
TemperatureTemplate:Val[9] K
Metallicity [Fe/H]−0.09[8] dex
RotationTemplate:Val[8]
Rotational velocity (v sin i)86[6] km/s
Age1.193[9] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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1 Centauri, or i Centauri,[10] is a yellow-white-hued binary star[7] system in the southern constellation Centaurus. It can be seen with the naked eye, having an apparent visual magnitude of +4.23.[2] Based upon an annual parallax shift of 51.54 mas as seen from Earth's orbit, it is located 63.3 light-years from the Sun. The system is moving closer to the Sun with a radial velocity of −21.5 km/s.[5]

Spectrographic images taken at the Cape Observatory between 1921 and 1923 showed this star has a variable radial velocity, which indicated this is a single-lined spectroscopic binary star system. The pair have an orbital period of 9.94 days and an eccentricity of about 0.2.[7]

The primary component has received a number of different stellar classifications. For example, Jaschek et al. (1964) lists F0V, F2III, F4III and F4IV, thus ranging in evolutionary state from an ordinary F-type main-sequence star to a giant star.[11] More recently, Houk (1982) listed a class of F3 V,[12] matching an ordinary main-sequence star that is generating energy through hydrogen fusion at its core. The NStars project gives it a classification of F2 V.[3]

References

Template:Reflist

Template:Stars of Centaurus

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named van Leeuwen2007
  2. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Gray2006
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named hr
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named deBruijne2012
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named aaa361_614
  7. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Jones1928
  8. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Montesinos2016
  9. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named David2015
  10. ↑ a b Template:Cite simbad
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Hauck1979
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named houk1979
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