145018

145018 is a number that has been assigned in various contexts. In 2006, it was used as a temporary satellite name when the International Astronomical Union was considering three new planets in the Kuiper Belt that were orbiting the Sun beyond Neptune. The objects were later confirmed to be dwarf planets and were renamed Eris, Makemake, and Haumea.

Eris is a dwarf planet, the fifth-largest in the solar system, and is known for being the most massive known dwarf planet that is not Pluto. It is about 2,326 kilometers in diameter. Makemake's diameter is about 1,430 kilometers, making it the second-largest known dwarf planet. Haumea has a spheroid shape due to rapid rotation and is about 1,960 kilometers in diameter, though its irregular shape makes this a difficult measurement.

The temporary name 145018 was originally given to Haumea but was changed when its actual size became clear. The tiny objects in the Kuiper Belt that 145018 was originally used to describe are not large enough to have surface gravity drawn into spheroid shapes as larger objects in the solar system do. There exists an ongoing debate about the definitions of planets.

It's worth noting that this code was likely given to an asteroid that has not been officially named.