Tags: Star.
UScoCTIO 108 is a binary system approximately 470 light-years away in the Upper Scorpius (USco) OB association. The primary UScoCTIO 108A with mass around 0.06 solar masses is a brown dwarf or low-mass red dwarf. The secondary UScoCTIO 108B with a mass around the deuterium burning limit of 13 Jupiter masses would be classified as either a brown dwarf or an extrasolar planet.