Pi4 Orionis

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Template:Short description

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π4 Orionis
Template:Location mark
Location of π4 Orionis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Orion
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.685[2]
Characteristics
Spectral type B2 III[3]
U−B Template:Engvar −0.797[2]
B−V Template:Engvar −0.180[2]
Astrometry
Radial velocity (Rv)23.3[4] km/s
Proper motion (μ) RA: −2.21[1] mas/yr
Dec.: +0.85[1] mas/yr
Parallax (π)3.10±0.18 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[5]
Period (P)9.5191 d
Eccentricity (e)0.03
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		165°
Semi-amplitude (K1)
(primary)		25.8 km/s
Details
π4 Ori A
MassTemplate:Val[6] Template:Solar mass
Radius9.1[7] Template:Solar radius
Luminosity19,726[6] Template:Solar luminosity
Surface gravity (log g)3.59[8] cgs
TemperatureTemplate:Val[7] K
Metallicity [Fe/H]−0.31[8] dex
Rotational velocity (v sin i)38[9] km/s
AgeTemplate:Val[10] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
π4 Ori, 3 Orionis, BD+05°745, FK5 179, HD 30836, HIP 22549, HR 1552, SAO 112142[11]
Database references
SIMBADdata

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Pi4 Orionis (π4 Ori, π4 Orionis) is a binary star system in the western part of the Orion constellation. It is visible to the naked eye with an apparent visual magnitude of 3.7.[2] Based upon an annual parallax shift of 3.1 mass,[1] it is located roughly 1,050 light-years from the Sun.

This is a spectroscopic binary star system with an orbital period of 9.5 days and an eccentricity of 0.03.[5] The primary component is a B-type star with a stellar classification of B2 III.[3] The stellar spectrum of π4 Ori A shows a strong depletion of the element boron.[12] It has nearly 11[6] times the mass of the Sun and nine times the Sun's radius.[7] The star is 15.4[10] million years old and has a projected rotational velocity of 38 km/s.[9] It shines with 19,726[6] times the solar luminosity from its outer atmosphere at an effective temperature of Template:Val.[7]

References

Template:Reflist

Template:Stars of Orion

  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 Oja1985
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Levato1975
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gcsrv1953
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Pourbaix2004
  6. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Hohle2010
  7. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Underhill1979
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Soubiran2010
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named simon-diaz2014
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Tetzlaff2011
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kaufer2010
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