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WISE 0855-0714 also known as W0855 is a sub-brown dwarf located just 7.3 light years away in the Hydra constellation. This celestial body is the nearest of its kind, and the fourth nearest star system from the Sun. The proximity of this object results in a very large parallax, and the third-highest proper motion relative to other stars in the night sky. With an estimated mass of 3 to 10 times that of Jupiter, it falls short of the minimum 13 Jupiter masses required for deuterium fusion. An entity of this size is typically considered a planet if it orbits another object. In this case, it might be classified as a free-floating or rogue planet. However, based on it's formation, it could also be considered a failed star or a brown dwarf of spectral class Y. One of the most intriguing features of this celestial body is its atmosphere. Infrared images taken with the Magellan-Baade telescope suggest the presence of sulfide clouds beneath water ice clouds covering 50% of the surface. Water vapor and methane have also been detected, but surprisingly; no phosphine, which is present in the atmosphere of Jupiter. This sub-brown dwarf also holds the record for being the coldest known object of its type, with temperatures ranging from -48 to -13 °C. This cold sub-brown dwarf is the nearest option to immerse in a unique atmospheric chemistry and physics, and thus is featured in this solar neighborhood travel guide.

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