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Star in the constellation Virgo From Wikipedia, the free encyclopedia
Tau Virginis (τ Vir, τ Virginis) is a single[13] star in the zodiac constellation Virgo. With an apparent visual magnitude of 4.28,[2] it is faintly visible to the naked eye. The distance to Tau Virginis, based upon parallax measurements, is approximately 225 light years with a margin of error of ±3 light years.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 14h 01m 38.79341s[1] |
Declination | +01° 32′ 40.3145″[1] |
Apparent magnitude (V) | 4.2777±0.0007[2] |
Characteristics | |
Spectral type | A2IV/V[3] |
U−B color index | +0.12[4] |
B−V color index | +0.11[4] |
Astrometry | |
Radial velocity (Rv) | −6.7±0.9[5] km/s |
Proper motion (μ) | RA: +17.49[1] mas/yr Dec.: −21.27[1] mas/yr |
Parallax (π) | 14.50 ± 0.18 mas[1] |
Distance | 225 ± 3 ly (69.0 ± 0.9 pc) |
Absolute magnitude (MV) | +0.5[6] |
Details | |
Mass | 1.96[7] M☉ |
Radius | 1.6[8] R☉ |
Luminosity | 70[9] L☉ |
Surface gravity (log g) | 3.39[7] cgs |
Temperature | 8,413±286[7] K |
Metallicity [Fe/H] | −0.19[10] dex |
Rotational velocity (v sin i) | 186[11] km/s |
Age | 724[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This star has a stellar classification of A2IV/V,[3] which matches the spectrum of an A-type main sequence star mixed with spectral traits of a subgiant. It is about 700[7] million years old and is spinning rapidly with a projected rotational velocity of 186 km/s.[11] The star has nearly double[7] the mass of the Sun and about 160% of the Sun's radius.[8] It shines with 70[9] times the luminosity of the Sun and has an effective temperature of 8413 K in its outer atmosphere.[7]
Tau Virginis has multiple visual companions, listed below:[14]
Companion | Visual Magnitude |
Angular Separation |
Position Angle |
Year Measured |
---|---|---|---|---|
B | 9.41 | 82.70″ | 287° | 2012 |
C | 13.10 | 176.70″ | 353° | 2000 |
D | 9.68 | 342.70″ | 85° | 2012 |
E | 12.00 | 14.6″ | 175° | 2009 |
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