Pi Centauri

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Template:Short description

Pi Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +3.90[2] (4.08 + 5.65)[3]
Characteristics
Spectral type B5Vn[4] + B6V[5]
B−V Template:Engvar Template:Val[2]
Astrometry
Radial velocity (Rv)Template:Val[2] km/s
Proper motion (μ) RA: Template:Val[1] mas/yr
Dec.: Template:Val[1] mas/yr
Parallax (π)9.12±0.34 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.30[2]
Orbit[6]
Period (P)Template:Val yr
Semi-major axis (a)Template:Val″
Eccentricity (e)Template:Val
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		Template:Val°
Details
A
Mass6.43[6] Template:Solar mass
Temperature16,760[7] K
Rotational velocity (v sin i)340[8] km/s
B
Mass3.68[6] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[9]
Database references
SIMBADdata

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Pi Centauri, Latinized from π Centauri, is a binary star system in the southern constellation of Centaurus. It has a blue-white hue and is visible to the naked eye with a combined apparent visual magnitude of +3.90.[2] The system is located at a distance of approximately 360 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of around +9 km/s.[2] It is a member of the Lower Centaurus–Crux subgroup of the Scorpius–Centaurus association.[10]

The magnitude +4.08[3] primary, designated component A, is a B-type main-sequence star with a stellar classification of B5Vn,[4] where the 'n' suffix indicates broad, diffuse (nebulous) lines due to rapid rotation. This star is spinning with a projected rotational velocity of 340 km/s, giving it an equatorial bulge that is 22% larger than the polar radius.[8] It has 6.4[6] times the mass of the Sun and is radiating 783[2] times the Sun's luminosity from its photosphere at an effective temperature of 16,760 K.[7]

The secondary companion, component B, is magnitude +5.65[3] with a class of B6V[5] and 3.7[6] times the Sun's mass. The pair orbit around their common barycentre once every 39 years with an eccentricity of 0.8530. The semi-major axis of the companion is 0.23 arcseconds at an inclination of 19.4°.[6]

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 van Leeuwen2007
  2. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  3. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Mason2001
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Hiltner1969
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Edwards1976
  6. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Tokovinin2012
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Zorec2009
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named vanBelle2012
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Bobylev2007
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