2MASS J21392676+0220226 (or CFBDS J213926+02202) is a brown dwarf located 34 light-years (10 parsecs) from Earth in the constellation Aquarius.

[5] Its surface is thought to be host to a massive storm,[6] resulting in large variability of its color.

[2] This brown dwarf was discovered in the Two Micron All-Sky Survey (2MASS).

[8] An alternative model from around 2016 can explain the variability and atmosphere of this brown dwarf without clouds.

[9] Once thought to be a binary object based on a 2010 study,[10][11] it has since been shown to in fact be single.