Pi Virginis

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.

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]
Distance	380 ± 20 ly (118 ± 5 pc)
Absolute magnitude (MV)	−0.70[5]
Orbit[6]
Primary	π Virginis A
Companion	π 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
Mass	2.2[7] M☉
Radius	1.5[8] R☉
Surface gravity (log g)	3.51[9] cgs
Temperature	8,000[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
SIMBAD	data

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]