A minor planet is an astronomical object in direct orbit around the Sun that is neither a planet nor exclusively classified as a comet. Minor planets can be dwarf planets, asteroids, trojans, centaurs, Kuiper belt objects, and other trans-Neptunian objects. The orbits of 692,604 minor planets were archived at the Minor Planet Center by 2015. The first minor planet to be discovered was Ceres in 1801.