Iota Virginis
Iota Virginis (ι Virginis, abbreviated Iota Vir, ι Vir) is a binary star in the constellation of Virgo. Its apparent magnitude is 4.08. Based on its parallax, it is assumed to be relatively nearby, at 72.5 light-years (22.2 parsecs).
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 16m 00.86951s |
| Declination | −06° 00′ 01.9633″ |
| Apparent magnitude (V) | 4.08 |
| Characteristics | |
| Spectral type | F7IV-V |
| U−B color index | +0.02 |
| B−V color index | +0.52 |
| Astrometry | |
| Radial velocity (Rv) | 12.51 ± 0.18 km/s |
| Proper motion (μ) | RA: -26.31 mas/yr Dec.: -419.38 mas/yr |
| Parallax (π) | 44.97 ± 0.19 mas |
| Distance | 72.5 ± 0.3 ly (22.24 ± 0.09 pc) |
| Absolute magnitude (MV) | 2.4 |
| Orbit | |
| Period (P) | 55 yr |
| Semi-major axis (a) | 0.830 ± 0.020″ |
| Eccentricity (e) | 0.1 ± 0.2 |
| Inclination (i) | 60 ± 9° |
| Longitude of the node (Ω) | 3 ± 20° |
| Periastron epoch (T) | 1950.7 ± 2.7 |
| Argument of periastron (ω) (secondary) | 336 ± 27° |
| Details | |
| ι Vir A | |
| Mass | 1.5 ± 0.05 M☉ |
| Radius | 2.5 R☉ |
| Luminosity | 8.7 L☉ |
| Surface gravity (log g) | 3.94 cgs |
| Temperature | 6282 K |
| Metallicity [Fe/H] | −0.11 dex |
| Rotational velocity (v sin i) | 16 km/s |
| ι Vir B | |
| Mass | 0.6 ± 0.2 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Its two components are designated Iota Virginis A (officially named Syrma /ˈsɜːrmə/, the traditional name for the system) and B.
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