Eta Virginis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 19m 54.35783s |
| Declination | −00° 40′ 00.5095″ |
| Apparent magnitude (V) | 3.890 |
| Characteristics | |
| Spectral type | A2 V |
| U−B color index | +0.055 |
| B−V color index | +0.029 |
| Astrometry | |
| Radial velocity (Rv) | +2.3 km/s |
| Proper motion (μ) | RA: −57.58 mas/yr Dec.: −25.19 mas/yr |
| Parallax (π) | 13.264±0.161 mas |
| Distance | 246 ± 3 ly (75.4 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.66 |
| Orbit | |
| Primary | η Vir Aa |
| Companion | η Vir Ab |
| Period (P) | 71.7916±0.0006 d |
| Semi-major axis (a) | 0.00736±0.0006″ |
| Eccentricity (e) | 0.244±0.007 |
| Inclination (i) | 45.5±0.9° |
| Orbit | |
| Primary | η Vir A |
| Companion | η Vir B |
| Period (P) | 7896.2±0.2 d |
| Semi-major axis (a) | 0.133±0.001″ |
| Eccentricity (e) | 0.087±0.002 |
| Inclination (i) | 50.6±0.1° |
| Details | |
| η Vir Aa | |
| Mass | 2.5039±0.1246 M☉ |
| Surface gravity (log g) | 3.0 cgs |
| Temperature | 9,333 K |
| Metallicity [Fe/H] | +0.11 dex |
| Rotational velocity (v sin i) | 18 km/s |
| η Vir Ab | |
| Mass | 1.8907±0.0932 M☉ |
| Details | |
| η Vir B | |
| Mass | 1.66±0.16 M☉ |
| Other designations | |
| Zaniah, 15 Virginis, HR 4689, HD 107259, BD+00°2926, FK5 460, HIP 60129, SAO 138721, CCDM 12199-0040, WDS J12199-0040 | |
| Database references | |
| SIMBAD | data |
Eta Virginis (η Virginis, abbreviated Eta Vir, η Vir) is a triple star system in the zodiac constellation of Virgo. From parallax measurements, it is about 246 light-years (75 parsecs) from the Sun. It has a combined apparent visual magnitude of 3.89, bright enough to be seen with the naked eye in dark skies.
The system consists of a binary pair designated Eta Virginis A together with a third companion, Eta Virginis B. A's two components are themselves designated Eta Virginis Aa (officially named Zaniah /ˈzeɪniə/, the traditional name of the system) and Ab.