WISE 0855−0714
Time-lapsed photo sequence of WISE 0855−0714's movement in the sky using captured images in the near infrared from the JWST | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 55m 10.83168s |
| Declination | −07° 14′ 42.5256″ |
| Characteristics | |
| 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, ≤12 MJup |
| Radius | 0.092 or 0.10–0.11 R☉ |
| Radius | 0.895 or 0.98–1.07 RJup |
| Luminosity | 4.95+0.23 −0.22×10−8 L☉ |
| Surface gravity (log g) | ~4 cgs |
| Temperature | 285 or 253–276 K |
| Metallicity [Fe/H] | ~0 dex |
| Age | 1–10 (assumed) Gyr |
| Other designations | |
| WISEA J085510.74-071442.5, GJ 11286 | |
| Database references | |
| SIMBAD | data |
WISE 0855−0714 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 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 stellar or substellar 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 and 10 Jupiter masses, which makes it a planetary-mass object below the 13 Jupiter mass rough limit for deuterium fusion.