Teide 1
Teide 1 was the first brown dwarf to be verified, in 1995. It is located in the Pleiades open star cluster, approximately from Earth. This object is more massive than a planet (), but less massive than a star (0.0544 M). The radius of the brown dwarf is about that of Jupiter. Its surface temperature is 2,600 ± 150 K, which is about half that of the Sun. Its luminosity is 0.08–0.05% of that of the Sun. Its age is only 120 million years compared to the Sun's age of 4.68 billion years. Discovery. Teide 1 was detected  by Rafael Rebolo López, María R. Zapatero-Osorio and Eduardo L. Martín in optical images obtained in January 1994 with the 0.80 meter diameter telescope (IAC-80) from the Instituto de Astrofísica de Canarias, located at the Teide Observatory on the island of Tenerife. Its cold nature was confirmed in December 1994 with the William Herschel telescope (WHT) of the Roque de los Muchachos observatory in La Palma. On May 22, 1995, the article reporting their discovery was submitted to the journal Nature, which published it on September 14, 1995. Meanwhile, a similar object, Calar 3, was discovered. The brown dwarf  nature of Teide 1 and Calar 3 was confirmed in 1996 following spectroscopic observations with the 10-meter diameter telescope of the W. M. Keck observatory of Mauna Kea on the island of Hawaii. Characteristics. Teide 1 is a brown dwarf of spectral type M8 whose luminosity (log L / L☉) is approximately -3.24 ± 0.04 dex and the effective temperature is approximately 2 584 ± 100 K. Its mass is approximately 0.052 solar mass. It is barely 120 million years old, and its surface temperature is estimated at around 2,600 Kelvin.