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WD 1856+534
White dwarf located in the constellation Draco / From Wikipedia, the free encyclopedia
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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.[3] WD 1856+534 is approximately half as massive as the Sun, while its radius is much smaller, being 40% larger than Earth.[4]
Quick Facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Draco |
WD 1856+534 | |
Right ascension | 18h 57m 39.34s[1] |
Declination | +53° 30′ 33.30″[1] |
Apparent magnitude (V) | 17.244±0.046[2] |
G 229-20 A | |
Right ascension | 18h 57m 38.4s[2] |
Declination | 53° 31′ 14.43″[2] |
Apparent magnitude (V) | 13.15[2] |
G 229-20 B | |
Right ascension | 18h 57m 38.33s[2] |
Declination | 53° 31′ 12.24″[2] |
Apparent magnitude (V) | 13.23[2] |
Characteristics | |
WD 1856+534 | |
Evolutionary stage | white dwarf |
Spectral type | DC(11?)[1] |
Apparent magnitude (J) | 15.677±0.055[1] |
Apparent magnitude (H) | 15.429±0.094[1] |
Apparent magnitude (K) | 15.548±0.186[1] |
Astrometry | |
Proper motion (μ) | RA: −240.759±0.148[1] mas/yr Dec.: −52.514±0.143[1] mas/yr |
Parallax (π) | 40.3983±0.0705[1] mas |
Distance | 80.737±0.144 ly (24.754±0.044[3] pc) |
G 99-20 A | |
Proper motion (μ) | RA: 256.12 mas/yr[2] Dec.: -52.72 mas/yr[2] |
Parallax (π) | 40.298 ± 0.024 mas[2] |
Distance | 80.94 ± 0.05 ly (24.82 ± 0.01 pc) |
G 99-20 B | |
Proper motion (μ) | RA: 241.4[2] mas/yr[2] Dec.: -44.176 mas/yr[2] |
Parallax (π) | 40.33 ± 0.024 mas[2] |
Distance | 80.87 ± 0.05 ly (24.80 ± 0.01 pc) |
Details[3] | |
WD 1856+534 | |
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 |
G 99-20 A[3] | |
Mass | 0.335±0.024 M☉ |
Radius | 0.35±0.02 R☉ |
Temperature | 3,521 K |
G 99-20 B[3] | |
Mass | 0.322±0.023 M☉ |
Radius | 0.34±0.02 R☉ |
Temperature | 3,513 K |
Position (relative to G 229-20)[3] | |
Angular distance | ~43″ |
Projected separation | 1030+130 −55 AU [3] |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
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