COCONUTS-2b, also known as WISEPA J075108.79-763449.6 b, is a gas giant extrasolar planet orbiting the M-type star L 34-26, located 35 light years away from Earth in the constellation Chamaeleon. The planet has a mass of 6.3 Jupiters, and is slightly larger than Jupiter, with a radius of about 1.12 Jupiters. This planet is known for its extreme orbital period; it takes over around 1,101,369 years to complete one orbit around the star, and it is around 6,000 AU away from it.
The planet was initially discovered in 2011, and was initially categorized as a free-floating brown dwarf named WISEPA J075108.79-73449.6. During the COol Companions ON Ultrawide orbiTS survey in 2020, it was discovered to be associated with L 34-26, which was announced in 2021. This is currently the closest extrasolar planet to Earth that has been directly imaged.
Due to its large orbital separation, COCONUTS-2b is a great laboratory to study the atmosphere and composition of young gas-giant exoplanets. Despite its great distance, the estimated temperature of the planet is around 434 K (161 °C; 322 °F).