WISE J1147−2040
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 47m 24.214s |
| Declination | −20° 40′ 20.44″ |
| Characteristics | |
| Evolutionary stage | Brown dwarf or a rogue planet |
| Spectral type | L7V |
| Astrometry | |
| Distance | 102 ± 12 ly (31.3 ± 3.8 pc) |
| Details | |
| Mass | 5–10 MJup |
| Radius | 2.08 RJup |
| Temperature | 1500 ± 100 K 1100–1200 K |
| Age | 7±2.5 Myr |
| Other designations | |
| WISEA 1147, 2MASS J11472421−2040204, WISEA J114724.10−204021.3 | |
| Database references | |
| SIMBAD | data |
WISEA J114724.10−204021.3 (abbreviated WISEA 1147) is a brown dwarf in the TW Hydrae association, a nearby group of very young stars and brown dwarfs. The object is notable because its estimate mass, 6±1 times the mass of Jupiter, places it in the mass range for rogue planets. As such, it is a free-floating object, unassociated with any star system.
The object was discovered using information from NASA's WISE (Wide-field Infrared Survey Explorer) and the 2MASS (Two Micron All-Sky Survey). Researchers inferred the young age for WISEA 1147 because it is a member of a group of stars that is only 10 million years old, and they estimated its mass using evolutionary models for brown dwarf cooling.