Omicron Virginis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 05m 12.54049s |
| Declination | +08° 43′ 58.7498″ |
| Apparent magnitude (V) | 4.12 |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | G8 IIIa CN-1Ba1CH1 |
| Astrometry | |
| Radial velocity (Rv) | −29.62 km/s |
| Proper motion (μ) | RA: −225.029 mas/yr Dec.: +33.282 mas/yr |
| Parallax (π) | 19.4936±0.1658 mas |
| Distance | 167 ± 1 ly (51.3 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.52 |
| Details | |
| Mass | 2.17 M☉ |
| Radius | 11.2±0.3 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 | |
| 9 Virginis, ο Vir, BD+09°2583, FK5 450, GJ 3703, HD 104979, HIP 58948, HR 4608, SAO 119213 | |
| 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. 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. 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. It has been suggested that an excess SiIV emission flux is due to an unseen white dwarf companion.
ο Virginis is a giant star around 11 times larger than the Sun. Although it is slightly cooler, it is radiating about 57 times the luminosity of the Sun. It is over twice as massive as the Sun and is around a billion years old. 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.