WD 1856+534
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. 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.
Artist's impression of WD 1856+534 and its planet. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 18h 57m 39.34s |
| Declination | +53° 30′ 33.30″ |
| Characteristics | |
| Evolutionary stage | white dwarf |
| Spectral type | DC(11?) |
| Apparent magnitude (J) | 15.677±0.055 |
| Apparent magnitude (H) | 15.429±0.094 |
| Apparent magnitude (K) | 15.548±0.186 |
| Astrometry | |
| Proper motion (μ) | RA: −240.759±0.148 mas/yr Dec.: −52.514±0.143 mas/yr |
| Parallax (π) | 40.3983±0.0705 mas |
| Distance | 80.737±0.144 ly (24.754±0.044 pc) |
| Details | |
| Mass | 0.518±0.055 M☉ |
| Radius | 0.01310±0.00054 R☉ |
| Surface gravity (log g) | 7.915±0.030 cgs |
| Temperature | 4710±60 K |
| Metallicity [Fe/H] | <−8.8 dex |
| Age | 5.85±0.5 Gyr |
| Position (relative to G 229-20) | |
| Angular distance | ~43″ |
| Projected separation | 1030+130 −55 AU |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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