Just heard on the radio a few minutes ago that the announcement has been made regarding the official definition of a planet and which celestial bodies qualify as planets. There was some talk of reclassifying Ceres, Charon, and UB313 as planets, bringing the total to tweleve, but in the end they chose the more sensible option of declassifying Pluto due to its small size and wobbly orbit. Pluto is now considered a "dwarf planet". No word yet on whether Ceres, Charon, or UB313 will also be classified as dwarf planets.