WISE 0855−0714
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 55m 10.83168s |
| Declination | −07° 14′ 42.5256″ |
| Characteristics | |
| Evolutionary stage | Sub-brown dwarf |
| Spectral type | Y4V |
| Apparent magnitude (J) | 25.00±0.53 |
| Apparent magnitude (H) | 23.83±0.24 |
| Astrometry | |
| Proper motion (μ) | RA: −8,123.7±1.3 mas/yr Dec.: 673.2±1.3 mas/yr |
| Parallax (π) | 439.0±2.4 mas |
| Distance | 7.43 ± 0.04 ly (2.28 ± 0.01 pc) |
| Details | |
| Mass | ~3–10 MJup |
| Radius | 0.89 RJup |
| Radius | 63,500 km |
| Luminosity | 4.9545×10−8 L☉ |
| Surface gravity (log g) | ~4 cgs |
| Temperature | 285 K |
| Metallicity [Fe/H] | ~0 dex |
| Age | 1–10 Gyr |
| Other designations | |
| WISEA J085510.74-071442.5, GJ 11286 | |
| Database references | |
| SIMBAD | data |
Location of WISE 0855−0714 in the constellation Hydra | |
WISE 0855−0714 (full designation WISE J085510.83−071442.5, or W0855 for short) is a sub-brown dwarf of spectral class Y4, located 7.4 light-years (2.3 parsecs) from the Sun in the constellation Hydra. It is the fourth-closest star or (sub-) brown dwarf system to the Sun and was discovered by Kevin Luhman in 2013 using data from the Wide-field Infrared Survey Explorer (WISE). It is the coldest brown dwarf found yet, having a temperature of about 285 K (12 °C; 53 °F). It has an estimated mass between 3–10 Jupiter masses, which makes it a planetary-mass object below the 13 Jupiter mass limit for deuterium fusion.