Question

Why the new planet get named as a number and how it is given?

Answer 1

The tradition of naming the planets after Greek and Roman gods and goddesses was carried on for the other planetsdiscovered as well. Mercury was named after the Roman god of travel. Venus was named after the Roman goddess of love and beauty. Mars was the Roman god of War.

The exoplanet namingconvention is an extension of the system used for namingmultiple-star systems as adopted by the International Astronomical Union (IAU). For exoplanetsorbiting a single star, the name is normally formed by taking the name of its parent star and adding a lowercase letter.