Phi Virginis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 28m 12.13894s |
| Declination | −02° 13′ 40.6579″ |
| Apparent magnitude (V) | +4.81 |
| Characteristics | |
| Spectral type | G2 IV |
| B−V color index | +0.683 |
| Astrometry | |
| Radial velocity (Rv) | −9.88±0.15 km/s |
| Proper motion (μ) |
RA: −139.53 mas/yr Dec.: −4.04 mas/yr |
| Parallax (π) | 27.58 ± 1.01mas |
| Distance | 118 ± 4 ly (36 ± 1 pc) |
| Absolute magnitude (MV) | 1.68 |
| Details | |
| Mass | 1.80 M☉ |
| Radius | 4 R☉ |
| Luminosity | 12.6 L☉ |
| Surface gravity (log g) | 3.4 cgs |
| Temperature | 5,534 K |
| Metallicity [Fe/H] | −0.06 dex |
| Rotational velocity (v sin i) | 15.5 km/s |
| Age | 1.5 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi Virginis (φ Vir, φ Virginis) is a binary star in the zodiac constellation of Virgo. It can be seen with the naked eye, having an apparent visual magnitude of +4.81. There is a magnitude 9.10 companion at an angular separation of 5.160 arcseconds. The distance to this system, as determined via parallax measurements, is roughly 118 light years.
The primary component has a stellar classification of G2 IV, indicating that it is a G-type subgiant which is evolving away from the main sequence. It is slightly variable with an amplitude of 0m.06. The star has about 1.8 times the mass of the Sun, 4 times the Sun's radius, and shines with 12.6 times the luminosity of the Sun. It is around 1.5 billion years old and is spinning with a projected rotational velocity of 15.5 km/s. The effective temperature of the star's outer atmosphere is 5,534 K.
The system is a source of X-ray emission with a luminosity of 2.158×1020 erg/s. A second visual companion lies at an angular separation of 91.40 arcseconds along a position angle of 202°, as of 2000.
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