SDSS J143317.78+101123.3

SDSS J143317.78+101123.3 (shortened to SDSS J1433+1011, more simply J1433) is a binary system composed of a white dwarf and a brown dwarf. The brown dwarf is about 57 Jupiter masses and has transitioned from a stellar object to a brown dwarf due to losing mass to the white dwarf. As of 2016, this was the only known binary of this type.