Phi Virginis
Binary star system in the constellation Virgo / From Wikipedia, the free encyclopedia
Phi Virginis (φ Virginis, abbreviated Phi Vir, φ Vir) is a binary star[7] in the zodiac constellation of Virgo. It can be seen with the naked eye, having an apparent visual magnitude of +4.81.[2] Based upon parallax measurements obtained during the Hipparcos mission, it is located roughly 118 light-years (36 parsecs) distant from the Sun.[1]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 14h 28m 12.13894s[1] |
Declination | −02° 13′ 40.6579″[1] |
Apparent magnitude (V) | +4.81[2] |
Characteristics | |
Spectral type | G2 IV[2] |
B−V color index | +0.683[3] |
Astrometry | |
Radial velocity (Rv) | −9.88±0.15[3] km/s |
Proper motion (μ) | RA: −139.53[1] mas/yr Dec.: −4.04[1] mas/yr |
Parallax (π) | 27.58 ± 1.01 mas[1] |
Distance | 118 ± 4 ly (36 ± 1 pc) |
Absolute magnitude (MV) | 1.68[4] |
Details[3] | |
Mass | 1.80[5] 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[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Close
The two components are designated Phi Virginis A (officially named Elgafar /ˈɛlɡəfɑːr/, the traditional name for the system)[8] and B.