2MASS J21392676 0220226 (or CFBDS J213926 02202) is a brown dwarf located 34 light-years (10 parsecs) from Earth in the constellation Aquarius. Its surface is thought to be host to a massive storm, resulting in large variability of its color. It is a member of the Carina-Near moving group. This brown dwarf was discovered in the Two Micron All-Sky Survey (2MASS).
The clouds on this brown dwarf are modelled as patchy, high-altitude forsterite cloud above a deeper, optically thick iron cloud. The silicate clouds cover 75-91% of the surface of this brown dwarf. An alternative model from around 2016 can explain the variability and atmosphere of this brown dwarf without clouds.
Once thought to be a binary object based on a 2010 study, it has since been shown to in fact be single.
References
