This subject has been discussed with over 1000 posts in half a dozen older threads.<br />Some corrections:<br /><br />"3.It’s larger than Quaoar and Sedna and the other objects." <br /> It is also smaller than Eris (formerly Xena)<br /><br />"5.It’s been called a planet since it was discovered in 1930."<br /><br />Back when asteroids were first being discovered in the early 1900's, a dozen or so were also called planets before it was realized that these were tiny objects, and there were hundreds of them, (now hundreds of thousands). At that time the number of planets went back to 8, until Pluto came along. When it was discovered it was assumed it was a large object, so it was called a planet. Over the years, with more observations, it was realized it was much smaller.<br /><br />"5.It is most similar to Quaoar and Sedna, the latest Kuiper Belt objects to be discovered. " <br />This is years out of date as thousands of Kuiper Belt objects have been discovered since then.<br /><br />You might also add to reasons for it not being a planet that it is one of dozens of objects in a class called plutinos which orbit the sun in similar orbits. These make exactly 2 revolutions to 3 for Neptune. These gravitationally locked orbits are called resonant orbits.<br /><br />As those who've been around know, I'm in the Pluto is not a planet crowd. There are many good arguments on both sides, it is not a simple issue.<br /><br />As of the current time the "official" IAU definition calls Pluto, Eris, and Ceres "dwarf planets"<br /><br />I'm sure the issue will be addressed again at the next IAU general assembly in 2009, when a more refined definition, considering all we will have learned by then will be hotly debated and decided. And Carnac predicts that a lot of people still won't be satisfied, no matter what is decided <img src="/images/icons/smile.gif" /><br /><br />For my take on things I refer you to
http://uplink.space.com/showthreaded.php?Cat=&Board=sciastro&Number=57</safety_wrapper <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>