Ceres, discovered Jan. 1, 1801 by Piazzi. He and other astronomers were looking for the "missing" planet that "ought" to exist between the orbits of Mars and Jupiter. Ceres is about 900 km in diameter.
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Pluto ... which I think was the first member of the newly-defined "dwarf planet" category ... has two known moons.
because Pluto is like an asteroid it is so tiny
No. Ceres, which used to be considered an asteroid, was recategorized as a "dwarf planet" in 2006, about the same time that Pluto was. Ceres is a small rocky body, the biggest in the asteroid belt.
The dwarf planet Eris truly deserves its designation as "dwarf planet"; it is less than one quarter of Earth's diameter, and about one percent of Earth's mass.
Eris (Greek ????, "Strife") is the Greek goddess of strife, discord, contention and rivalry, her name being translated into Latin as Discordia, -ae, I-f. Her Greek opposite is Harmonia, whose Latin counterpart is Concordia. Homer equated her with the war-goddess Enyo. Eris, the solar system's largest known dwarf planet, is named after the goddess.