Periodic Table of Exoplanets

This “periodic table” of exoplanets, including confirmed and NASA Kepler candidates, divide most of the known exoplanets into six mass and three temperatures groups (18 categories total).

Exoplanets in the Hot Zone are too close to their parent star to have liquid water. Those in the Warm Zone have the right distance for liquid water. Water can only exist as ice for those in the Cold Zone. Mercurians are low mass bodies, similar to Mercury and our Moon, that are only able to have an atmosphere in the Cold Zone (i.e. Titan).

Subterrans are comparable to Mars, Terrans to Earth, and Superterrans are up to 10 times as massive as Earth, a category with no comparable examples in the Solar System. Neptunians are similar in mass to Neptune and Uranus, and Jovians to Jupiter and Saturn, or larger.

So far, only eight Terrans and eight Superterrans can be considered potential habitable candidates out of the over 1,600 exoplanets represented in this figure. These are identified and ranked in detail with various habitability assessments on the Habitable Exoplanet Catalog, which actually shows how much Earth-like are these exoplanets.