Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 12h 00m 52.39042s[1] |
Declination | +06° 36′ 51.5571″[1] |
Apparent magnitude (V) | 4.64[2] |
Characteristics | |
Spectral type | A5 V[3] |
U−B color index | +0.12[2] |
B−V color index | +0.12[2] |
Astrometry | |
Radial velocity (Rv) | −10.4[4] km/s |
Proper motion (μ) | RA: +0.26[1] mas/yr Dec.: −30.10[1] mas/yr |
Parallax (π) | 8.49 ± 0.39 mas[1] |
Distance | 380 ± 20 ly (118 ± 5 pc) |
Absolute magnitude (MV) | −0.70[5] |
Orbit[6] | |
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[7] km/s |
Details | |
π Vir A | |
Mass | 2.2[7] M☉ |
Radius | 1.5[8] R☉ |
Surface gravity (log g) | 3.51[9] cgs |
Temperature | 8,000[9] K |
Rotational velocity (v sin i) | 71[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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.[2] The distance to this star, based upon parallax measurements,[1] is roughly 380 light years.
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.[7] 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.[9]
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