I think another reason ceres was demoted was because of it's odd shape. And of course they are only planets when they are round. Lord knows Earth isn't a little egg-shapped itself. Either way, here is a pretty good paper written about 2003 UB313 and 2003 EL61. From Cal tech
Oh yeah.. I remember the good old Apple II version.. those were the days.. Killing off little suzie, and reminding myself "lead ahead with the bison". Lol to show my true age, we played Oregon Trail in early grade school, and in 7th grade we had the "new" Mac IIcx.. Weee! If only...