2MASS J10475385+2124234
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 10h 47m 53.85456s |
| Declination | 21° 24′ 23.4684″ |
| Characteristics | |
| Spectral type | T6.5 |
| Apparent magnitude (J) | 15.819 ± 0.059 |
| Apparent magnitude (H) | 15.797 ± 0.120 |
| Apparent magnitude (K) | 16.20 ± 0.03 |
| Astrometry | |
| Proper motion (μ) | RA: −1714 mas/yr Dec.: −489 mas/yr |
| Parallax (π) | 94.73±3.81 mas |
| Distance | 34 ± 1 ly (10.6 ± 0.4 pc) |
| Details | |
| Mass | 42±26 MJup |
| Radius | 0.94 ± 0.16 RJup |
| Luminosity | 4.35×10−6 L☉ |
| Surface gravity (log g) | 4.96 ± 0.49 cgs |
| Temperature | 880 ± 76 K |
| Rotation | 1.77 ± 0.04 h |
| Other designations | |
| 2MASSW J1047539+212423 2MASSI J1047539+212423 2MASSI J1047538+212423 WISEA J104752.35+212417.2 | |
| Database references | |
| SIMBAD | data |
2MASS J10475385+2124234 (abbreviated to 2MASS J1047+21) is a brown dwarf of spectral class T6.5, in the constellation Leo. This object lies at a distance of 34 light-years from Earth. It first attracted attention by becoming the first brown dwarf of spectral class T from which radio waves were detected. This discovery then permitted its wind speeds to be computed.