Eta Virginis
 Location of η Virginis (circled) |
|
| 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) | 12.29 ± 0.45mas |
| Distance | 265 ± 10 ly (81 ± 3 pc) |
| Orbit | |
| Primary | η Vir Aa |
| Companion | η Vir Ab |
| Period (P) | 71.7916 ± 0.0006 days |
| 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) | 7,896.2 ± 0.2 days |
| 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 | |
Eta Virginis (η Virginis, abbreviated Eta Vir, η Vir), also named Zaniah, is a multiple star system in the zodiac constellation of Virgo. From parallax measurements, it was found to be roughly 265 light-years (81 parsecs) from the Sun. It has an apparent visual magnitude of 3.89, which is bright enough for the system to be seen with the naked eye in dark skies.
η Virginis (Latinised to Eta Virginis) is the star's Bayer designation.
It bore the traditional name Zaniah /zəˈnaɪ.ə/, derived from the Arabic زاوية zāwiyah "corner", the same source as Zavijava (Beta Virginis). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Zaniah for this star on 12 September 2016 and it is now so entered in the IAU Catalog of Star Names.
In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Thanih al Aoua, which was translated into Latin as Secunda Latratoris, meaning "the second barker". This star, along with Beta Virginis (Zavijava), Gamma Virginis (Porrima), Delta Virginis (Auva) and Epsilon Virginis (Vindemiatrix), were Al ʽAwwāʼ, "the Barker".
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