Upsilon Virginis
Star in the constellation Virgo
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Upsilon Virginis (υ Vir, υ Virginis) is a single[7] star in the zodiac constellation of Virgo. It has an apparent visual magnitude of 5.25,[2] making it faintly visible to the naked eye. According to the Bortle scale, it is visible from backlit suburban skies at night. Based upon a measured annual parallax shift of 12.1 mas, it is located roughly 269 light-years (82.6 parsecs) from the Sun. If the star were at a distance of 33 light-years (10 parsecs), it would have a magnitude of +0.4 and be the third-brightest star in the night sky.[3]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 19m 32.47974s[1] |
| Declination | −02° 15′ 55.8587″[1] |
| Apparent magnitude (V) | 5.27[2] |
| Characteristics | |
| Evolutionary stage | giant[1] |
| Spectral type | G9 III[3] |
| U−B color index | +0.81[2] |
| B−V color index | 1.023[4] |
| Astrometry | |
| Radial velocity (Rv) | −26.68±0.16[4] km/s |
| Proper motion (μ) | RA: −118.809[1] mas/yr Dec.: −71.508[1] mas/yr |
| Parallax (π) | 12.1137±0.1301 mas[1] |
| Distance | 269 ± 3 ly (82.6 ± 0.9 pc) |
| Absolute magnitude (MV) | 0.4[3] |
| Details | |
| Mass | 1.72[5] M☉ |
| Radius | 12[4] R☉ |
| Luminosity | 64.6[4] L☉ |
| Surface gravity (log g) | 2.7[4] cgs |
| Temperature | 4,753[4] K |
| Metallicity [Fe/H] | −0.22[4] dex |
| Rotational velocity (v sin i) | 3.4[4] km/s |
| Age | 377[1] Myr |
| Other designations | |
| υ Vir, 102 Virginis, BD−01°2938, FK5 3134, HD 125454, HIP 70012, HR 5366, SAO 139866[6] | |
| Database references | |
| SIMBAD | data |
This star has a stellar classification of G9 III,[3] which indicates it is an evolved G-type giant star. It has an estimated 172% of the Sun's mass and has expanded to 12 times the radius of the Sun, from which it is shining with 64.6 times the solar luminosity.[4] The effective temperature of the star's outer atmosphere is 4,753 K.[4] Based upon its motion through space, there is a 66% chance of being a member of the Hercules stream and a 27% chance it is a thin disk star.[8]