What do you mean by 2003 UB313?

2003 UB313, also known as Eris, is a dwarf planet located in the scattered disc region of the solar system. It was discovered in January 2005 and is one of the largest known objects in the Kuiper Belt, with a diameter estimated to be about 2,326 kilometers. Eris is particularly notable because its discovery contributed to the reclassification of Pluto as a dwarf planet, highlighting the complexities of defining celestial bodies in our solar system. Its surface is covered in a layer of ice and is believed to have a very thin atmosphere.