Brown dwarf
The first confirmed brown dwarf was discovered in 1994. They called this object Teide 1 and it was found in the Pleiades open cluster. Nature highlighted "Brown dwarfs discovered, official" in the front page of that issue. The distance, chemical composition, and age of Teide 1 was established because it is in the young Pleiades star cluster. Teide 1's  mass is 55 times that of Jupiter, and clearly below the stellar-mass limit.