WISE J1147−2040

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.^[5][6] The object is notable because its estimate mass, 6±1 times the mass of Jupiter, places it in the mass range for rogue planets.^[7] As such, it is a free-floating object, unassociated with any star system.^[8]

WISE J1147−2040

WISE J1147−2040 Credit: legacy surveys
Observation data Epoch J2000      Equinox J2000
Constellation	Hydra
Right ascension	11h 47m 24.214s[1]
Declination	−20° 40′ 20.44″[1]
Characteristics
Evolutionary stage	Brown dwarf or a rogue planet
Spectral type	L7V[1]
Astrometry
Distance	102 ± 12 ly (31.3 ± 3.8[2] pc)
Details
Mass	5–10[3] MJup
Radius	2.08[citation needed] RJup
Temperature	1500 ± 100[2] K 1100–1200[2] K
Age	7±2.5[4] Myr
Other designations
WISEA 1147, 2MASS J11472421−2040204, WISEA J114724.10−204021.3
Database references
SIMBAD	data

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.