89 Virginis

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89 Virginis
Observation data
Epoch J2000        Equinox J2000
Constellation Virgo
Right ascension 13h 49m 52.28340s [1]
Declination −18° 08′ 03.0103″ [1]
Apparent magnitude  (V)4.959 [2]
Characteristics
Spectral type K0III [3]
U−B color index +0.86 [4]
B−V color index +1.06 [4]
Astrometry
Radial velocity (Rv)−39.45±0.17 [1] km/s
Proper motion (μ)RA: −101.100 [1] mas/yr
Dec.: −38.200 [1] mas/yr
Parallax (π)13.9184±0.2053  mas [1]
Distance 234 ± 3  ly
(72 ± 1  pc)
Absolute magnitude  (MV)0.618 [5]
Details
Mass 1.70 [6]   M☉
Radius 12 [7]   R☉
Luminosity 69 [6]   L☉
Surface gravity (log g)2.6 [7]   cgs
Temperature 4,706±13 [6]   K
Metallicity [Fe/H]−0.03 [7]   dex
Age 3.40 [6]   Gyr
Other designations
89 Vir, BD−17°3937, GJ 9460, HD 120452, HIP 67494, HR 5196, SAO 158186 [8]
Database references
SIMBAD data

89 Virginis is a single [9] star in the zodiac constellation of Virgo, located 234  light years from the Sun. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 4.959. [2] The star is moving closer to the Earth with a heliocentric radial velocity of −39 km/s. [1]

This is an evolved giant star with a stellar classification of K0 III, [3] having exhausted the hydrogen at its core and expanded away from the main sequence. It is a red clump star, which indicates it is generating energy through helium fusion at its core. [5] This object is 3.4 billion years old with 1.7 [6] times the mass of the Sun and 12 [7] times the Sun's radius. It is radiating 69 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4706 K. [6]

References

  1. 1 2 3 4 5 6 7 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H.
  3. 1 2 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5: 0. Bibcode:1999MSS...C05....0H.
  4. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. 1 2 Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi: 10.1111/j.1365-2966.2007.11852.x .
  6. 1 2 3 4 5 6 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv: 1507.01466 . Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID   118505114.
  7. 1 2 3 4 Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (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 .
  8. ↑ "89 Vir". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-02-09.
  9. ↑ Eggleton, P. P.; Tokovinin, A. A. (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.
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