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WISE 0855−0714
Sub-brown dwarf in the constellation Hydra / From Wikipedia, the free encyclopedia
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WISE 0855−0714 (full designation WISE J085510.83−071442.5,[6] or W0855 for short) is a sub-brown dwarf 2.28±0.01 parsecs (7.43±0.04 light-years)[2] from Earth, therefore the fourth-closest star or (sub-) brown dwarf system to the Sun,[7] the discovery of which was announced in April 2014 by Kevin Luhman using data from the Wide-field Infrared Survey Explorer (WISE).[7] As of 2014[update], WISE 0855−0714 has the third-highest proper motion (8,151.6±1.8 mas/yr)[2] after Barnard's Star (10,300 mas/yr) and Kapteyn's Star (8,600 mas/yr)[6] and the fourth-largest parallax (439.0±2.4 mas)[2] of any known star or brown dwarf. It is also the coldest object of its type found in interstellar space, having a temperature of about 285 K (12 °C; 53 °F).[4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydra |
Right ascension | 08h 55m 10.83168s[1] |
Declination | −07° 14′ 42.5256″[1] |
Characteristics | |
Evolutionary stage | Sub-brown dwarf |
Spectral type | Y4V[2][3] |
Apparent magnitude (J) | 25.00±0.53[1] |
Apparent magnitude (H) | 23.83±0.24[1] |
Astrometry | |
Proper motion (μ) | RA: −8,123.7±1.3 mas/yr[2] Dec.: 673.2±1.3 mas/yr[2] |
Parallax (π) | 439.0 ± 2.4 mas[2] |
Distance | 7.43 ± 0.04 ly (2.28 ± 0.01 pc) |
Details | |
Mass | ~3–10[4] MJup |
Radius | 0.89[lower-alpha 1][4] RJup |
Luminosity | 4.9545×10−8[lower-alpha 2][4] L☉ |
Surface gravity (log g) | ~4[4] cgs |
Temperature | 285[4] K |
Metallicity [Fe/H] | ~0[4] dex |
Age | 1–10[4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Location of WISE 0855−0714 in the constellation Hydra |