A Y dwarf is a brown dwarf or planetary-mass object that is colder than 500 Kelvin
An object with a spectral type Y (also called Y dwarf) is either a brown dwarf or a free-floating planetary-mass object. They have temperatures below around 500 Kelvin (227°C; 440°F) and are colder than T-dwarfs.[1][2] Y-dwarfs have a similar spectrum when compared to the giant planet Jupiter.[3]
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