The chief features of an inner or terrestrial planet is that most of them are dense and gas a solid surface and is somewhat close to a star.
Step-by-step explanation:
The planets that are mostly composed of either rocks or metals and has a hard surface along with a heavy metallic core is considered as Terrestrial planet. We have four this type of planet in our solar system that is near to the biggest star Sun.
These planets are- Earth, Venus, Mars and Mercury. Almost all of them have a dense and solid surface. IAU defined these planets as planets that orbits the sun. So, keeping in mind these features of a planet I can identify the newly found planet as terrestrial or not.