Astronomy:Upsilon Virginis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 3.2 3.3 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, doi:10.1093/pasj/60.4.781, Bibcode: 2008PASJ...60..781T.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ Luck, R. Earle; Heiter, Ulrike (June 2007), "Giants in the Local Region", The Astronomical Journal 133 (6): 2464–2486, doi:10.1086/513194, Bibcode: 2007AJ....133.2464L.
- ↑ "ups Vir -- Variable Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=ups+Vir, retrieved 2016-09-18.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1051/0004-6361:20078788, Bibcode: 2008A&A...480...91S.
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