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 | 41.61 ± 26.03 MJup |
| Radius | 0.94 ± 0.16 RJup |
| Luminosity | 0.000004365 L☉ |
| Surface gravity (log g) | 4.96 ± 0.49 cgs |
| Temperature | 880 ± 76 K |
| Rotation | 1.77 ± 0.04 h |
| Age | 0.5–10 Gyr |
| 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 about 34 light-years from Earth, hence in galactic topographical and interstellar medium study terms being in the Local Bubble and very nearby in the Orion Arm. The object 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.