WD 1856+534
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| WD 1856+534 | |
| Right ascension | 18h 57m 39.344s |
| Declination | +53° 30′ 33.30″ |
| Apparent magnitude (V) | 17.244±0.046 |
| G 229-20 A | |
| Right ascension | 18h 57m 37.960s |
| Declination | +53° 31′ 15.25″ |
| Apparent magnitude (V) | 13.15 |
| G 229-20 B | |
| Right ascension | 18h 57m 37.911s |
| Declination | +53° 31′ 12.92″ |
| Apparent magnitude (V) | 13.23 |
| Characteristics | |
| WD 1856+534 | |
| Evolutionary stage | white dwarf |
| Spectral type | DA |
| Apparent magnitude (J) | 15.677±0.055 |
| Apparent magnitude (H) | 15.429±0.094 |
| Apparent magnitude (K) | 15.548±0.186 |
| G 229-20 | |
| Evolutionary stage | red dwarf + red dwarf |
| Spectral type | M3.5V |
| Astrometry | |
| WD 1856+534 | |
| Proper motion (μ) | RA: +240.749 mas/yr Dec.: −52.470 mas/yr |
| Parallax (π) | 40.3931±0.0506 mas |
| Distance | 80.7 ± 0.1 ly (24.76 ± 0.03 pc) |
| Absolute magnitude (MV) | +14.37 |
| G 229-20 A | |
| Radial velocity (Rv) | 17.19±0.33 km/s |
| Proper motion (μ) | RA: +256.055 mas/yr Dec.: −52.810 mas/yr |
| Parallax (π) | 40.3480±0.0149 mas |
| Distance | 80.84 ± 0.03 ly (24.784 ± 0.009 pc) |
| G 229-20 B | |
| Radial velocity (Rv) | 17.38±0.35 km/s |
| Proper motion (μ) | RA: +241.527 mas/yr Dec.: −44.335 mas/yr |
| Parallax (π) | 40.3648 ± 0.0147 mas |
| Distance | 80.80 ± 0.03 ly (24.774 ± 0.009 pc) |
| Position (relative to G 229-20) | |
| Angular distance | ~43″ |
| Projected separation | 1030+130 −55 AU |
| Details | |
| WD 1856+534 | |
| Mass | 0.605±0.013 M☉ |
| Radius | 0.0121±0.0002 R☉ |
| Surface gravity (log g) | 8.05±0.02 cgs |
| Temperature | 4,920±50 K |
| Metallicity [Fe/H] | <−8.8 dex |
| Age | Cooling age: 5.4±0.7 Gyr Total age: 7.4 to 10 Gyr |
| G 229-20 A | |
| Mass | 0.335±0.024 M☉ |
| Radius | 0.35±0.02 R☉ |
| Luminosity | 0.016 L☉ |
| Temperature | 3,521 K |
| G 229-20 B | |
| Mass | 0.322±0.023 M☉ |
| Radius | 0.34±0.02 R☉ |
| Luminosity | 0.015 L☉ |
| Temperature | 3,513 K |
| Other designations | |
| WDS J18576+5331 | |
| WD 1856+534: LP 141-14, LSPM J1857+5330, NLTT 47263, TOI-1690, TIC 267574918, 2MASS J18573936+5330332 | |
| G 229-20: LP 141-13, LSPM J1857+5331, NLTT 47260/47261, 2MASS J18573793+5331140 | |
| Database references | |
| SIMBAD | WD 1856+534 |
| G 229-20 | |
| G 229-20 A | |
| G 229-20 B | |
| Exoplanet Archive | data |
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WD 1856+534 is a white dwarf located in the constellation of Draco. At a distance of about 25 parsecs (80 ly) from Earth, it is the outer component of a visual triple star system consisting of an inner pair of red dwarf stars, named G 229-20. The white dwarf displays a featureless absorption spectrum, lacking strong optical absorption or emission features in its atmosphere. It has an effective temperature of 4,700 K (4,430 °C; 8,000 °F), corresponding to an age of approximately 5.8 billion years. WD 1856+534 is approximately half as massive as the Sun, while its radius is much smaller, being 40% larger than Earth.