Upsilon2 Centauri

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Template:Other stars by Bayer designation

Upsilon2 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Centaurus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.33[2]
Characteristics
Spectral type F7 II/III[3]
U−B Template:Engvar +0.26[2]
B−V Template:Engvar +0.61[2]
Variable type None[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)2.57±1.05 mas[1]
Distanceapprox. Template:Rnd ly
(approx. Template:Rnd pc)
Absolute magnitude (MV)−3.51[4]
Orbit[6]
Period (P)207.357 d
Eccentricity (e)0.55
Periastron epoch (T)2423880.5 JD
Argument of periastron (ω)
(secondary)		88°
Semi-amplitude (K1)
(primary)		12.7 km/s
Details
MassTemplate:Val[7] Template:Solar mass
Luminosity (bolometric)3,919[7] Template:Solar luminosity
Surface gravity (log g)2.00[8] cgs
Temperature6,495[7] K
Rotational velocity (v sin i)0.0[8] km/s
AgeTemplate:Val[9] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Upsilon2 Centauri (υ2 Centauri) is a binary star[6] system in the southern constellation Centaurus. It is visible to the naked eye with an apparent visual magnitude of +4.33.[2] Based upon an annual parallax shift of just 2.57 mas as seen from Earth,[1] this star is located roughly 1,300 light years from the Sun. Relative to its neighbors, the system has a peculiar velocity of Template:Val and it may form a runaway star system.[9]

This is a single-lined spectroscopic binary star system with an orbital period of 207.357 days and an eccentricity of 0.55.[6] The primary component has the spectrum of an evolved F-type giant/bright giant hybrid with a stellar classification of F7 II/III.[3] It is around 46[9] million years old with 6.9 times the mass of the Sun. The star is radiating 3,919 times the Sun's luminosity from its photosphere at an effective temperature of 6,495 K.[7]

References

Template:Reflist

Template:Stars of Centaurus

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named fernie1983
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Houk1978
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Eggen1985
  5. ↑ 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 Pourbaix
  7. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Hohle2010
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Mallik2003
  9. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Tetzlaff2011
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
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