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 0.012.47 arcseconds,[1] it is located roughly 262 light-years (80 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 32.48100s[1]
Declination −02° 15′ 55.8637″[1]
Apparent magnitude (V) 5.27[2]
Characteristics
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: −117.33[1] mas/yr
Dec.: −71.62[1] mas/yr
Parallax (π)12.47 ± 0.31[1] mas
Distance262 ± 7 ly
(80 ± 2 pc)
Absolute magnitude (MV)0.4[3]
Details[4]
Mass1.72[5] M☉
Radius12 R☉
Luminosity64.6 L☉
Surface gravity (log g)2.7 cgs
Temperature4,753 K
Metallicity [Fe/H]−0.22 dex
Rotational velocity (v sin i)3.4 km/s
Other designations
υ Vir, 102 Virginis, BD−01°2938, FK5 3134, HD 125454, HIP 70012, HR 5366, SAO 139866[6]
Database references
SIMBADdata

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. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M.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.
  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.
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