| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13 49 52.28340 |
| Declination | −18° 08′ 03.0103″ |
| Apparent magnitude (V) | 4.959 |
| Characteristics | |
| Spectral type | K0III |
| U−B color index | +0.86 |
| B−V color index | +1.06 |
| Astrometry | |
| Radial velocity (Rv) | −39.45±0.17 km/s |
| Proper motion (μ) | RA: −101.100 mas/yr Dec.: −38.200 mas/yr |
| Parallax (π) | 13.9184 ± 0.2053 mas |
| Distance | 234 ± 3 ly (72 ± 1 pc) |
| Absolute magnitude (MV) | 0.618 |
| Details | |
| Mass | 1.70 M☉ |
| Radius | 12 R☉ |
| Luminosity | 69 L☉ |
| Surface gravity (log g) | 2.6 cgs |
| Temperature | 4,706±13 K |
| Metallicity | −0.03 dex |
| Age | 3.40 Gyr |
| Other designations | |
| 89 Vir, BD−17° 3937, GJ 9460, HD 120452, HIP 67494, HR 5196, SAO 158186 | |
| Database references | |
| SIMBAD | data |
89 Virginis is a single 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. The star is moving closer to the Earth with a heliocentric radial velocity of −39 km/s.
This is an evolved giant star with a stellar classification of K0 III, 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. This object is 3.4 billion years old with 1.7 times the mass of the Sun and 12 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.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ 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.
- ^ 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.
- ^ 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.
- "89 Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-09.
- 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.
