WD 0137−349
Binary star system in the constellation Sculptor / From Wikipedia, the free encyclopedia
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WD 0137-349 is a binary star in the constellation of Sculptor. It is located about 330 light-years (100 parsecs) away, and appears exceedingly faint with an apparent magnitude of 15.33.[2]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Sculptor |
Right ascension | 01h 39m 42.847s[1] |
Declination | −34° 42′ 39.32″[1] |
Apparent magnitude (V) | +15.33 ± 0.02[2] |
Characteristics | |
Spectral type | DA[3] + L8[2]/T[4] |
B−V color index | −0.02 |
Astrometry | |
Proper motion (μ) | RA: -42.059[5] mas/yr Dec.: -48.895[5] mas/yr |
Parallax (π) | 9.8472 ± 0.0367 mas[5] |
Distance | 331 ± 1 ly (101.6 ± 0.4 pc) |
Orbit[6] | |
Period (P) | 0.0803 ± 0.0002 |
Semi-major axis (a) | 0.65 R☉ |
Periastron epoch (T) | 2453686.5276 ± 0.0001 |
Semi-amplitude (K1) (primary) | 27.9 ± 0.3 km/s |
Semi-amplitude (K2) (secondary) | −187.5 ± 1.1 km/s |
Details | |
WD 0137-349A | |
Mass | 0.39 ± 0.035[6] M☉ |
Radius | 0.0186 ± 0.0012[6] R☉ |
Luminosity | 0.023 ± 0.004[6] L☉ |
Surface gravity (log g) | 7.49 ± 0.08[6] cgs |
Temperature | 16500 ± 500[6] K |
Age | 250 ± 80[6] Myr |
WD 0137-349B | |
Mass | 0.053 ± 0.006[2] M☉ |
Temperature | 1300 to 1400[2] K |
Other designations | |
Database references | |
SIMBAD | A |
B |
Close
It is composed of a white dwarf with a brown dwarf in orbit around it, and is one of the few systems composed of a white dwarf and an associated brown dwarf.[6] The brown dwarf orbits with a period of 116 minutes, or nearly 2 hours.[6]