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Pi Virginis

π Virginis
Location of π Virginis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 12h 00m 52.39042s[1]
Declination +06° 36′ 51.5571″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Spectral type A5 V[3]
U−B color index +0.12[2]
B−V color index +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]
Distance380 ± 20 ly
(118 ± 5 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] M☉
Radius1.5[8] R☉
Surface gravity (log g)3.51[9] cgs
Temperature8,000[9] K
Rotational velocity (v sin i)71[3] km/s
Other designations
BD+07°2502, FK5 1311, HD 104321, HIP 58590, HR 4589, SAO 119164[10]
Database references
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Evans1966 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ ESA (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog. Bibcode:1997yCat.1239....0E.
  7. ^ a b c Cite error: The named reference Ducati2011 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference cadars was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Paunzen2013 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

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