Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 12h 19m 54.35783s[1] |
Declination | –00° 40′ 00.5095″[1] |
Apparent magnitude (V) | 3.890[2] |
Characteristics | |
Spectral type | A2 V[3] |
U−B color index | +0.055[2] |
B−V color index | +0.029[2] |
Astrometry | |
Radial velocity (Rv) | +2.3[4] km/s |
Proper motion (μ) | RA: –57.58[1] mas/yr Dec.: –25.19[1] mas/yr |
Parallax (π) | 13.264 ± 0.161 mas[5] |
Distance | 246 ± 3 ly (75.4 ± 0.9 pc) |
Absolute magnitude (MV) | −0.66[6] |
Orbit[7] | |
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[7] | |
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[8] M☉ |
Surface gravity (log g) | 3.0[9] cgs |
Temperature | 9,333[9] K |
Metallicity [Fe/H] | +0.11[9] dex |
Rotational velocity (v sin i) | 18[10] km/s |
η Vir Ab | |
Mass | 1.8907 ± 0.0932 M☉ |
Details[7] | |
η Vir B | |
Mass | 1.66 ± 0.16 M☉ |
Other designations | |
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.[5] It has a combined apparent visual magnitude of 3.89,[2] bright enough to be seen with the naked eye in dark skies.
The system consists of[12] 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)[13][14] and Ab.
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