Upsilon Virginis

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]

υ Virginis

Location of υ Virginis (circled)
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]

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
3. Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781.
4. Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
5. Luck, R. Earle; Heiter, Ulrike (June 2007), "Giants in the Local Region", The Astronomical Journal, 133 (6): 2464–2486, Bibcode:2007AJ....133.2464L, doi:10.1086/513194.
6. "ups Vir -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-18.
7. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
8. Soubiran, C.; et al. (March 2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.