Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Virgo |
Right ascension | 12h 05m 12.54049s [1] |
Declination | +08° 43′ 58.7498″ [1] |
Apparent magnitude (V) | 4.12 [2] |
Characteristics | |
Spectral type | G8 IIIa CN-1Ba1CH1 [3] |
Astrometry | |
Radial velocity (Rv) | −29.62 [4] km/s |
Proper motion (μ) |
RA: −218.69
[1]
mas/
yr Dec.: +57.76 [1] mas/ yr |
Parallax (π) | 19.98 ± 0.22 mas [1] |
Distance | 163 ± 2
ly (50.1 ± 0.6 pc) |
Absolute magnitude (MV) | +0.52 [5] |
Details [4] | |
Mass | 2.17 M☉ |
Radius | 9.62 R☉ |
Luminosity | 57 L☉ |
Surface gravity (log g) | 3.17 cgs |
Temperature | 5,107 K |
Metallicity [Fe/H] | −0.30 dex |
Rotational velocity (v sin i) | 2.23 km/s |
Age | 0.88 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Omicron Virginis (ο Vir, ο Virginis) is a star in the zodiac constellation of Virgo. It is visible to the naked eye with an apparent visual magnitude of +4.12. [5] Based upon parallax measurements, it is about 163 light years from the Sun.
ο Virginis is a G-type giant star with a stellar classification of G8 IIIa CN-1Ba1CH1. [3] This indicates that it is a Barium star. Typically Barium stars are close binaries with a white dwarf companion, but no companion has been detected for ο Virginis. [6] It has been suggested that an excess SiIV emission flux is due to an unseen white dwarf companion. [7]
ο Virginis is a giant star around ten times larger than the Sun. Although it is slightly cooler, it is radiating about 60-132 times the luminosity of the Sun. It is over twice as massive as the Sun and is around a billion years old. [5] [4] A simplified statistical analysis suggests that ο Virginis is likely to be a red giant branch star fusing hydrogen in a shell around an inert helium core, but there is about a 22% chance that it is a horizontal branch star fusing helium in its core. [8]