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][3]), the single known component of the system, located in the constellation Virgo.
| 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 | |
| Spectral type | DZ10.0[2][3] |
| 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[4] mas/yr Dec.: -1113.581[4] mas/yr |
| Parallax (π) | 119.7566 ± 0.0304 mas[4] |
| Distance | 27.235 ± 0.007 ly (8.350 ± 0.002 pc) |
| Absolute magnitude (MV) | 15.08[2][5][note 1] |
| Details | |
| Mass | 0.55 ± 0.03[2] M☉ |
| Radius | 0.013[2][note 2] R☉ |
| Surface gravity (log g) | 7.95 ± 0.02[2] cgs |
| Temperature | 5030 ± 120[2] K |
| Age | 5.19[3][note 3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Distance
editWolf 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,[5] corresponding to a distance 8.24 ± 0.23 pc, or 26.87 ± 0.75 ly.
| Source | Paper | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|---|
| Woolley (1970) | Woolley et al., 1970 | 135 ± 12 | 7.4 ± 0.7 | 24.2 ± 2.1 | [6] |
| GJ, 3rd version | Gliese, Jahreiss, 1991 | 122.2 ± 3.9 | 8.18 ± 0.26 | 26.69 ± 0.85 | [7] |
| YPC, 4th edition | van Altena et al., 1995 | 121.4 ± 3.4 | 8.24 ± 0.23 | 26.87 ± 0.75 | [5] |
| Gaia EDR3, 2020 | - | 119.7566±0.0304 | 8.3503±0.0002 | 27.235±0.007 | [4] |
Physical parameters
editWolf 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.[3] Wolf 489 and should appear white with a slight shade of yellow, nearly the same color as a K-type main sequence star.
Notes
editSee also
editReferences
edit- ^ 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.
- ^ a b c d e f g h i j k l m 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.
- ^ 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.
- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
- ^ Stars within 25 pc of the Sun (Woolley+ 1970)
- ^ Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)