Gamma Virginis

γ Virginis
Location of γ Virginis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 12h 41m 39.64344s[1]
Declination –01° 26′ 57.7421″[1]
Apparent magnitude (V) 2.74 (3.650/3.560[2])
Characteristics
Spectral type F0 V/F0 V[2]
U−B color index -0.05
B−V color index 0.36
Variable type unknown
Astrometry
Radial velocity (Rv)-19.5[3] km/s
Proper motion (μ) RA: –614.76[1] mas/yr
Dec.: 61.34[1] mas/yr
Parallax (π)85.58 ± 0.60 mas[1]
Distance38.1 ± 0.3 ly
(11.68 ± 0.08 pc)
Absolute magnitude (MV)2.41[4]
Orbit[5]
CompanionGamma Virginis B
Period (P)168.93 ± 0.30 yr
Semi-major axis (a)3.662 ± 0.013″
Eccentricity (e)0.8825 ± 0.0010
Inclination (i)148.82 ± 0.43°
Longitude of the node (Ω)213.79 ± 0.72°
Periastron epoch (T)2005.438 ± 0.067
Details
A
Mass1.4±0.05[6] M☉
Radius1.45[7] R☉
Luminosity4.27[8] L☉
Surface gravity (log g)4.27[8] cgs
Temperature6,922±112[8] K
Metallicity [Fe/H]−0.08±0.06[9] dex
Rotational velocity (v sin i)29.7[8] km/s
Age1.46+0.2
−0.18[9] Gyr
B
Mass1.4±0.05[6] M☉
Radius1.45[7] R☉
Luminosity4.63+0.15
−0.14[10] L☉
Surface gravity (log g)4.49[11] cgs
Temperature6,871±62[10] K
Metallicity [Fe/H]−0.07[11] dex
Rotational velocity (v sin i)23[10] km/s
Other designations
Porrima, Antevorta, Arich,[citation needed] 29 Virginis, BD-00°2601, GCTP 2924.00, Gl 482 AB, HIP 61941, LHS 2604, SAO 138917, WDS 12417-0127
γ Vir A: HD 110379, HR 4825, LFT 937, LTT 4843
γ Vir B: HD 110380, HR 4826, LFT 937, LTT 4844
Database references
SIMBADγ Vir
γ Vir A
γ Vir B

Gamma Virginis (γ Virginis, abbreviated Gamma Vir, γ Vir), officially named Porrima /ˈpɒrɪmə/,[12][13] is a binary star system in the constellation of Virgo. It consists of two almost identical main sequence stars at a distance of about 38 light-years.

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