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Wolf 489

Coordinates: Sky map 13h 36m 31.81s, +03° 40′ 45.9″
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Wolf 489
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Virgo
Right ascension 13h 36m 31.81s[1]
Declination +03° 40′ 45.″[1]
Apparent magnitude (V) 14.66[2]
Characteristics
Evolutionary stage white dwarf[3]
Spectral type DZ10.0[2][4]
Apparent magnitude (B) 15.59[1]
Apparent magnitude (V) 14.63[1]
Apparent magnitude (R) 14.0[1]
Apparent magnitude (I) 14.1[1]
Apparent magnitude (J) 13.06[1]
Apparent magnitude (H) 12.82[1]
Apparent magnitude (K) 12.69[1]
Astrometry
Proper motion (μ) RA: −3735.839[5] mas/yr
Dec.: −1113.581[5] mas/yr
Parallax (π)119.7566±0.0304 mas[5]
Distance27.235 ± 0.007 ly
(8.350 ± 0.002 pc)
Absolute magnitude (MV)15.04[3]
Details
Mass0.55±0.03[2] M☉
Radius0.013[2][note 1] R☉
Surface gravity (log g)7.95±0.02[2] cgs
Temperature5,030±120[2] K
Age5.19[4][note 2] Gyr
Other designations
WD 1334+039,[2][4] Wolf 489,[1] Gliese 518,[1] LHS 46,[2] LFT 1023,[1] LTT 13961,[1] NLTT 34618,[1] G 062-053,[6] G 62-53,[1] G 64-4,[1] EGGR 100,[1] 2MASS J13363181+0340458,[1] USNO-B1.0 0936-00229354[1]
Database references
SIMBADdata

Wolf 489 (WD 1334+039, LHS 46, G 062-053, Gliese 518) is a nearby degenerate star (white dwarf) of spectral class DZ10.0[2][4]), the single known component of the system, located in the constellation Virgo.

Distance

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Wolf 489, probably, is the 12th closest white dwarf, or, possibly, 9th–14th (see Gliese 293, GJ 1087, Gliese 915, GJ 1276 and Gliese 318). Its trigonometric parallax from YPC (Yale Parallax Catalog) is 121.4 ± 3.4 mas, corresponding to a distance 8.24 ± 0.23 pc, or 26.87 ± 0.75 ly.[6]

Wolf 489 parallax data
Source Parallax, mas Distance, pc Distance, ly
Woolley (1970)[7] 135±12 7.4±0.7 24.2±2.1
GJ, 3rd version[8] 122.2±3.9 8.18±0.26 26.69±0.85
YPC, 4th edition[6] 121.4±3.4 8.24±0.23 26.87±0.75
Gaia DR3, 2023[5] 119.7566±0.0304 8.3503±0.0002 27.235±0.007

Physical parameters

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Wolf 489's mass is 0.55 ± 0.03 Solar masses,[2] its surface gravity is 107.95 ± 0.02 (8.91 · 107) cm·s−2,[2] or approximately 91 000 of Earth's, corresponding to a radius 9089 km, or 143% of Earth's.

Wolf 489's temperature is 5030 ± 120 K[2] (comparable with that of early K-type main sequence stars); its cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) is 5.19 Gyr.[4] Wolf 489 and should appear white with a slight shade of yellow, nearly the same color as a K-type main sequence star.

Notes

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  1. ^ From surface gravity and mass.
  2. ^ White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

See also

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References

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  1. ^ a b c d e f g h i j k l m n o p q r s t u "GJ 518 -- White Dwarf". Centre de Données astronomiques de Strasbourg. Retrieved 2011-11-02.
  2. ^ a b c d e f g h i j k l Holberg, J. B.; Sion; Oswalt; McCook; Foran; Subasavage (2008). "A New Look at the Local White Dwarf Population". The Astronomical Journal. 135 (4): 1225–1238. Bibcode:2008AJ....135.1225H. doi:10.1088/0004-6256/135/4/1225. S2CID 122855486.
  3. ^ a b Limoges, M. -M.; Bergeron, P.; Lépine, S. (2015). "Physical Properties of the Current Census of Northern White Dwarfs within 40 pc of the Sun". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1505.02297. Bibcode:2015ApJS..219...19L. doi:10.1088/0067-0049/219/2/19.
  4. ^ a b c d e Sion, Edward M.; Holberg; Oswalt; McCook; Wasatonic (2009). "The White Dwarfs within 20 Parsecs of the Sun: Kinematics and Statistics". The Astronomical Journal. 138 (6): 1681–1689. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681. S2CID 119284418.
  5. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  6. ^ a b c Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
  7. ^ Stars within 25 pc of the Sun (Woolley+ 1970)
  8. ^ Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)
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