WD 0137−349
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sculptor |
| Right ascension | 01h 39m 42.847s |
| Declination | −34° 42′ 39.32″ |
| Apparent magnitude (V) | +15.33 ± 0.02 |
| Characteristics | |
| Spectral type | DA + L8/T |
| U−B color index | −0.71 |
| B−V color index | −0.02 |
| Astrometry | |
| A | |
| Proper motion (μ) | RA: −42.059 mas/yr Dec.: −48.895 mas/yr |
| Parallax (π) | 9.8472±0.0367 mas |
| Distance | 331 ± 1 ly (101.6 ± 0.4 pc) |
| Orbit | |
| Period (P) | 0.0803±0.0002 |
| Semi-major axis (a) | 0.65 R☉ |
| Periastron epoch (T) | HJD 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 M☉ |
| Radius | 0.0186±0.0012 R☉ |
| Luminosity | 0.023±0.004 L☉ |
| Surface gravity (log g) | 7.49±0.08 cgs |
| Temperature | 16,500±500 K |
| Age | 250±80 Myr |
| WD 0137−349B | |
| Mass | 0.053±0.006 M☉ |
| Temperature | 1,300 to 1,400 K |
| Other designations | |
| 2MASS J01394284−3442393, BPS CS 29504-0036 | |
| Database references | |
| SIMBAD | A |
| B | |
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.
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. The brown dwarf orbits with a period of 116 minutes, or nearly 2 hours.