2MASS J03552337+1133437 (2MASS J0355+11) is a nearby brown dwarf of spectral type L5ó, located in the constellation Taurus at approximately 29.9 light-years from Earth.
2MASS J0355+11 was discovered in 2006 by Reid et al.
It is young, has a low surface gravity and a red spectral energy distribution compared to field brown dwarfs. It likely belongs to the AB Doradus moving group, which is 50 million years old. At this age it would have a mass of about 13 . Alternatively at an older age of 150 Myrs it would have a mass of about 30 . It has a very red color thought to be caused by photospheric dust.
A study with James Webb Space Telescope's MIRI instrument found silicate features that are shifted to bluer wavelengths compared to other brown dwarfs in the same sample. The researchers found a 10% flux difference in the mid-infrared between JWST and Spitzer spectra. But it is not clear if this is due systematic uncertainties between the instruments or real variability. Multiple MIRI observations are needed to confirm this variability.
It is a radio-quiet brown dwarf, indicating an absence of stellar flares. Its carbon to oxygen ratio, equal to 0.56, is similar to that of the Sun.
A 2010 search for companions to L dwarfs identified this object as a candidate binary system.
The interstellar comet 2I/Borisov passed 1.4 light-years (0.44 parsecs) from 2MASS J0355+11 280 thousand years before arriving in the Solar System.