WISE 0855−0714 is a brown dwarf of spectral class Y4, located 7.4 light-years 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. 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.