[Telepathic Intruder]

"It is in orbit around the Sun."

So are asteroids and comets, as well as meteors, and dust specs. A planet must dominate its orbit by sweeping away all other competing debris. That's what makes something a planet according to nebular theory of planet formation. Pluto is part of another group of objects beyond Neptune which, like the asteroid belt, have not cleared their orbits. They all share a collective one making them Kuiper belt objects, not planets. There are thousands of them. Pluto is not only a fraction the mass of our moon, but is wildly eccentric in its orbit and with a high inclination to the ecliptic. Very much unlike the other planets but very similar to the other KBO's. Why you attribute such importance to this tiny object that's one of thousands of others is just plain irrational. But irrationality seems to be the driving force for some. At the time of its discovery, nothing was known about Pluto. They declared it a planet only from a desire to make the headlines, but it should never have been called one. Ceres was once called a planet, until they realized it was only an asteroid--only one in a larger group of them.

[MarvinStinson]

“It is unlike a planet in every way except being round.”

The above is an irrational and WRONG statement.

One of three basic characteristics of a planet is that it revolves around the sun.

Sounds to me like you harbor some personal animosity toward Pluto.