(Y, Y-class star, Y dwarf)
(type of dwarf with a temperature less than 700K)
A Y-type star (Y-class star or Y dwarf) is a star in the Y-class, a
spectral class for brown dwarves cooler
than T-type stars.
Other than that, their spectra is not well-characterized.
As of 2011, six bodies are known that fit the criteria.
(star type,spectral type)
brown dwarf (BD)