2MASS_J21392676+0220226
2MASS J21392676+0220226
Brown dwarf star in the constellation Aquarius
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.[7] It is a member of the Carina-Near moving group.[2] 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.[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.[12][13]