FU Tauri
FU Tauri and its companion (lower left) Credit: Image Credit: NASA/ESA/CSA JWST; Ya-Lin Wu et al.; processing: Meli_thev | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| A | |
| Right ascension | 04h 23m 35.3912s |
| Declination | +25° 03′ 02.74″ |
| B | |
| Right ascension | 04h 23m 35.3912s |
| Declination | +25° 03′ 02.74″ |
| Characteristics | |
| Spectral type | M7.25 + M9.25 |
| Apparent magnitude (G) | 15.2 + 20.5 |
| Variable type | T Tau |
| Astrometry | |
| A | |
| Proper motion (μ) | RA: 6.895 mas/yr Dec.: −21.026 mas/yr |
| Parallax (π) | 7.5981±0.1497 mas |
| Distance | 429 ± 8 ly (132 ± 3 pc) |
| B | |
| Proper motion (μ) | RA: 12.450 mas/yr Dec.: −21.761 mas/yr |
| Parallax (π) | 7.4909±1.2887 mas |
| Distance | approx. 440 ly (approx. 130 pc) |
| Details | |
| A | |
| Mass | 0.05 M☉ |
| Radius | 1.8 R☉ |
| Luminosity | 0.2 L☉ |
| Temperature | 2,838 K |
| Age | ≤1 Myr |
| B | |
| Mass | 0.015 M☉ |
| Luminosity | 0.0039 L☉ |
| Temperature | 2,375 K |
| Age | 1 Myr |
| Other designations | |
| WDS J04236+2503A, 2MASS J04233539+2503026, Gaia DR2 149629483705467008 | |
| Database references | |
| SIMBAD | A |
| B | |
FU Tauri is a brown dwarf binary system in the constellation of Taurus about 429 light years away. The secondary is very close to the lower limit for brown dwarfs and several databases list it as a distant massive exoplanet.