89 Virginis

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]
Distance234 ± 3 ly
(72 ± 1 pc)
Absolute magnitude (MV)0.618[5]
Details
Mass1.70[6] M
Radius12[7] R
Luminosity69[6] L
Surface gravity (log g)2.6[7] cgs
Temperature4,706±13[6] K
Metallicity [Fe/H]−0.03[7] dex
Age3.40[6] Gyr
Other designations
89 Vir, BD−17° 3937, GJ 9460, HD 120452, HIP 67494, HR 5196, SAO 158186[8]
Database references
SIMBADdata

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. ^ a b c d e f g 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. ^ a b 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. ^ a b 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. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. ^ a b 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. ^ a b c d e f 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. ^ a b c d 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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