Gamma Virginis
Star in the constellation Virgo / From Wikipedia, the free encyclopedia
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Gamma Virginis (γ Virginis, abbreviated Gamma Vir, γ Vir), officially named Porrima /ˈpɒrɪmə/,[8][9] 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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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] |
Distance | 38.1 ± 0.3 ly (11.68 ± 0.08 pc) |
Absolute magnitude (MV) | 2.41[4] |
Orbit[5] | |
Companion | Gamma 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 | |
Mass | 1.56[3] M☉ |
Surface gravity (log g) | 4.26[3] cgs |
Temperature | 6,757[6] K |
Metallicity [Fe/H] | –0.07[2] dex |
Age | 1.14[7] Gyr |
Other designations | |
γ Vir A: HD 110379, HR 4825, LFT 937, LTT 4843 | |
γ Vir B: HD 110380, HR 4826, LFT 937, LTT 4844 | |
Database references | |
SIMBAD | γ Vir |
γ Vir A | |
γ Vir B |
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