Gamma Virginis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 41m 39.64344s |
| Declination | −01° 26′ 57.7421″ |
| Apparent magnitude (V) | 2.74 (3.650/3.560) |
| Characteristics | |
| Spectral type | F0 V/F0 V |
| U−B color index | −0.05 |
| B−V color index | +0.36 |
| Variable type | not variable |
| Astrometry | |
| Radial velocity (Rv) | −19.5 km/s |
| Proper motion (μ) | RA: −614.76 mas/yr Dec.: 61.34 mas/yr |
| Parallax (π) | 85.58±0.60 mas |
| Distance | 38.1 ± 0.3 ly (11.68 ± 0.08 pc) |
| Absolute magnitude (MV) | 2.41 |
| Orbit | |
| Companion | Gamma Virginis B |
| Period (P) | 169.104±0.011 yr |
| Semi-major axis (a) | 3.639±0.008″ |
| Eccentricity (e) | 0.8815±0.00018 |
| Inclination (i) | 149.46±0.16° |
| Longitude of the node (Ω) | 35.34±0.42° |
| Periastron epoch (T) | 2005.511±0.00019 |
| Argument of periastron (ω) (secondary) | 255.02±0.37° |
| Details | |
| A | |
| Mass | 1.4±0.05 M☉ |
| Radius | 1.45 R☉ |
| Luminosity | 4.27 L☉ |
| Surface gravity (log g) | 4.27 cgs |
| Temperature | 6,922±112 K |
| Metallicity [Fe/H] | −0.08±0.06 dex |
| Rotational velocity (v sin i) | 29.7 km/s |
| Age | 1.46+0.2 −0.18 Gyr |
| B | |
| Mass | 1.4±0.05 M☉ |
| Radius | 1.45 R☉ |
| Luminosity | 4.63+0.15 −0.14 L☉ |
| Surface gravity (log g) | 4.49 cgs |
| Temperature | 6,871±62 K |
| Metallicity [Fe/H] | −0.07 dex |
| Rotational velocity (v sin i) | 23 km/s |
| Other designations | |
| Porrima, Antevorta, 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 | |
| SIMBAD | γ Vir |
| γ Vir A | |
| γ Vir B | |
Gamma Virginis (γ Virginis, abbreviated Gamma Vir, γ Vir), officially named Porrima /ˈpɒrɪmə/, 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.