WASP-121 is an exoplanet located about 850 light-years away from Earth in the constellation Phoenix. It is classified as a hot Jupiter, meaning it is a gas giant similar in size to Jupiter but orbits very close to its star, resulting in extremely high temperatures. The planet orbits its host star, WASP-121, every 1.27 days. Due to its proximity to the star, WASP-121 experiences intense heat, leading to a unique atmosphere that may contain elements like sodium and potassium. This makes it a subject of interest for astronomers studying planetary atmospheres and the conditions of distant worlds.