Zeta Virginis
Zeta Virginis (ζ Virginis, abbreviated Zeta Vir, ζ Vir) is a binary star in the zodiac constellation of Virgo. It is visible to the naked eye with an apparent visual magnitude of +3.376 and is located about a half degree south of the celestial equator. Based on parallax measurements obtained during the Hipparcos mission, it is about 74 light-years (23 parsecs) distant from the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 34m 41.591s |
| Declination | –00° 35′ 44.95″ |
| Apparent magnitude (V) | +3.376 |
| Characteristics | |
| Spectral type | A3 V |
| U−B color index | +0.141 |
| B−V color index | +0.114 |
| Astrometry | |
| Radial velocity (Rv) | –13.2 km/s |
| Proper motion (μ) | RA: –280.48 ± 0.17 mas/yr Dec.: +49.05 ± 0.12 mas/yr |
| Parallax (π) | 44.03 ± 0.19 mas |
| Distance | 74.1 ± 0.3 ly (22.71 ± 0.10 pc) |
| Absolute magnitude (MV) | 1.64±0.05 |
| Details | |
| ζ Vir A | |
| Mass | 2.041±0.024 M☉ |
| Radius | 2.079±0.025 R☉ |
| Luminosity | 17.885±0.252 L☉ |
| Surface gravity (log g) | 4.12 cgs |
| Temperature | 8247±52 K |
| Rotational velocity (v sin i) | 222 km/s |
| Age | 0.51 Gyr |
| ζ Vir B | |
| Mass | 0.168+0.012 −0.016 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
The two components are designated Zeta Virginis A (officially named Heze /ˈhiːziː/, a mid-20th-century name for the system) and B.
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