Teide 1

Teide 1 was the first brown dwarf to be verified, in 1995. It is located in the Pleiades open star cluster, approximately 400 light-years (120 pc) from Earth.

The apparent magnitude of this faint object is 17.76, which is so faint that it can only seen in large amateur or bigger telescopes. Its absolute magnitude (the brightness of an object if it were 10 parsecs away) is 12.38, or about 140 times brighter than it is at 120 parsecs.

This object is more massive than a planet (55 ± 15 MJ), but less massive than a star (0.052 MSun). The radius of the brown dwarf is about that of Jupiter (or one-tenth that of the Sun). Its surface temperature is 2600 ± 150 K, which is about half that of the Sun. Its luminosity is 0.1% that of the Sun, meaning it takes six months for Teide 1 to emit the amount of radiation emitted by the Sun in four hours. Its age is only 120 million years compared to the Sun's age of 4.6 billion years.

This brown dwarf is hot enough to fuse lithium in its core, but not hot enough to fuse hydrogen like the Sun.