Pi Virginis

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Template:Short description

π Virginis
Template:Location mark
Location of π Virginis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Spectral type A5 V[3]
U−B Template:Engvar +0.12[2]
B−V Template:Engvar +0.12[2]
Astrometry
Radial velocity (Rv)−10.4[4] km/s
Proper motion (μ) RA: +0.26[1] mas/yr
Dec.: −30.10[1] mas/yr
Parallax (π)8.49±0.39 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.70[5]
Orbit[6]
Primaryπ Virginis A
Companionπ Virginis B
Period (P)282.69 days
Semi-major axis (a)3.55 mas
Eccentricity (e)0.265
Inclination (i)62.71°
Longitude of the node (Ω)149.34°
Periastron epoch (T)2448281.3906
Argument of periastron (ω)
(secondary)		312°
Semi-amplitude (K1)
(primary)		26.20[7] km/s
Details
π Vir A
Mass2.2[7] Template:Solar mass
Radius1.5[8] Template:Solar radius
Surface gravity (log g)3.51[9] cgs
Temperature8,000[9] K
Rotational velocity (v sin i)71[3] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
BD+07°2502, FK5 1311, HD 104321, HIP 58590, HR 4589, SAO 119164[10]
Database references
SIMBADdata

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Pi Virginis (π Vir, π Virginis) is a binary star in the zodiac constellation of Virgo. It is visible to the naked eye with an apparent visual magnitude of 4.64.[2] The distance to this star, based upon parallax measurements,[1] is roughly 380 light years.

This is a spectroscopic binary system with a stellar classification of A5V. They have an orbital period of 283 days with an eccentricity of 0.27.[7] The mass ratio of the two stars is about 0.47, with the primary having an estimated mass of around 2.2 times that of the Sun. The primary is a cool metallic-lined Am star.[9]

References

Template:Reflist

Template:Virgo

  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 Mermilliod1986
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Royer2007
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Evans1966
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Ducati2011
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named cadars
  9. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Paunzen2013
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
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