WISE 0855−0714
WISE 0855−0714 (full designation WISE J085510.83−071442.5, or W0855 for short) is a sub-brown dwarf 2.28±0.01 parsecs (7.43±0.04 light-years) from Earth, therefore the fourth-closest star or (sub-) brown dwarf system to the Sun, the discovery of which was announced in April 2014 by Kevin Luhman using data from the Wide-field Infrared Survey Explorer (WISE). As of 2014, WISE 0855−0714 has the third-highest proper motion (8,151.6±1.8 mas/yr) after Barnard's Star (10,300 mas/yr) and Kapteyn's Star (8,600 mas/yr) and the fourth-largest parallax (439.0±2.4 mas) of any known star or brown dwarf. It is also the coldest object of its type found in interstellar space, having a temperature in the range 225 to 260 K (−48 to −13 °C; −55 to 8 °F).
Time-lapsed photo sequence of WISE 0855−0714's movement in the sky using captured images from the WISE and the Spitzer telescopes. | |
| 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 |
| Temperature | 250±50 K |
| 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 | |
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