Pi Virginis
Pi Virginis (π Vir, π Virginis) is a binary star in the zodiac constellation of Virgo. It is visible to the naked eye with an apparent visual magnitude of 4.64. The distance to this star, based upon parallax measurements, is roughly 380 light years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 00m 52.39042s |
| Declination | +06° 36′ 51.5571″ |
| Apparent magnitude (V) | 4.64 |
| Characteristics | |
| Spectral type | A5 V |
| U−B color index | +0.12 |
| B−V color index | +0.12 |
| Astrometry | |
| Radial velocity (Rv) | −10.4 km/s |
| Proper motion (μ) | RA: +0.26 mas/yr Dec.: −30.10 mas/yr |
| Parallax (π) | 8.49 ± 0.39 mas |
| Distance | 380 ± 20 ly (118 ± 5 pc) |
| Absolute magnitude (MV) | −0.70 |
| Orbit | |
| Primary | π Virginis A |
| Companion | π Virginis B |
| Period (P) | 282.69 days |
| Semi-major axis (a) | 3.55 mas |
| Eccentricity (e) | 0.265 |
| Inclination (i) | 62.71° |
| Longitude of the node (Ω) | 149.34° |
| Periastron epoch (T) | 2448281.3906 |
| Argument of periastron (ω) (secondary) | 312° |
| Semi-amplitude (K1) (primary) | 26.20 km/s |
| Details | |
| π Vir A | |
| Mass | 2.2 M☉ |
| Radius | 1.5 R☉ |
| Surface gravity (log g) | 3.51 cgs |
| Temperature | 8,000 K |
| Rotational velocity (v sin i) | 71 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a spectroscopic binary system with a stellar classification of A5V. They have an orbital period of 283 days with an eccentricity of 0.27. The mass ratio of the two stars is about 0.47, with the primary having an estimated mass of around 2.2 times that of the Sun. The primary is a cool metallic-lined Am star.
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