We're not that far into the first day of the general availability of the IAU's draft resolution for the definition of a planet and, already, there seems to be signs of confusion.
Alok Jha, writing for The Guardian, says:
If the ideas are approved at the general meeting of the IAU in Prague next week, schoolchildren will, in future, have to learn that the solar system has 12 planets: eight classical ones that dominate the system - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune and Uranus - and four in a new category called plutons.That's not quite right, Ceres won't be a "pluton", the idea is that it will be known as a "dwarf planet". As well as the draft resolution saying this:
These are Pluto, its moon Charon, a spherical asteroid that sits between Mars and Jupiter called Ceres, and an object called 2003 UB313 but nicknamed Xena by American astronomers who found it.
We recognize that Ceres is a planet by the above scientific definition. For historical reasons, one may choose to distinguish Ceres from the classical planets by referring to it as a "dwarf planet."the question and answer sheet that goes with it is also quite explicit about it:
Q: Is Ceres a "pluton"?If a science correspondent is getting this wrong you've got to wonder how the public at large will comprehend it.
File Under: IAU, Pluto, Plutons, Definition of a Planet.