Just to say that the holograms are inaccurate in game. You'll get a gas giant with an "earth world" icon, for example. The metal rich and high metal ones seem to share all metal-related icons.
Earth world always seem to be the earth-world icon though, as are stars and black holes seem consistent too
This is meant to be correct in-game, and it is. Whether FD chose the correct icon for any given body is another story