WISE J035000.32−565830.2 (designation abbreviated to WISE 0350−5658) is a (sub-)brown dwarf of spectral class Y1,[1] located in constellation Reticulum, the nearest known star/brown dwarf in this constellation.

WISE 0350−5658 was discovered in 2012 by J. Davy Kirkpatrick and colleagues from data collected by the Wide-field Infrared Survey Explorer (WISE) in the infrared at a wavelength of 40 cm (16 in), whose mission lasted from December 2009 to February 2011.

[1] WISE 0350−5658 is one of the nearest known brown dwarfs: its trigonometric parallax is 0.184 ± 0.010 arcsecond, corresponding to a direct distance of 5.4 pc (17.7 ly).

The researchers also found an effective temperature of 350±25 K and surface gravity of log g=4.0±0.25 for WISE 0350−5658.

[5] Another work using Hubble found a slightly higher mass of 7−13 MJ.