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Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. [2] [4] Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth i.e. over 250 astronomical units (AUs).
Asteroids are given minor planet numbers, but not all minor planets are asteroids. Minor planet numbers are also given to objects of the Kuiper belt , which is similar to the asteroid belt but farther out (around 30–60 AU), whereas asteroids are mostly between 2–3 AU from the Sun or at the orbit of Jupiter 5 AU from the Sun.
10199 Chariklo / ˈ k ær ə k l oʊ / is the largest confirmed centaur, a class of minor planet in the outer Solar System.It orbits the Sun between Saturn and Uranus, grazing the orbit of Uranus.
How many new asteroids must be discovered before we stumble upon the elusive Planet 9? Within the next decade we shall find out.
Ceres (minor-planet designation: 1 Ceres) is a dwarf planet in the middle main asteroid belt between the orbits of Mars and Jupiter.It was the first known asteroid, discovered on 1 January 1801 by Giuseppe Piazzi at Palermo Astronomical Observatory in Sicily, and announced as a new planet.
2 Pallas. Pallas (minor-planet designation: 2 Pallas) is the third-largest asteroid in the Solar System by volume and mass. It is the second asteroid to have been discovered, after Ceres, and is likely a remnant protoplanet. Like Ceres, it is believed to have a mineral composition similar to carbonaceous chondrite meteorites, though ...
9 Metis is one of the larger main-belt asteroids. It is composed of silicates and metallic nickel - iron, and may be the core remnant of a large asteroid that was destroyed by an ancient collision. [ 9 ] Metis is estimated to contain just under half a percent of the total mass of the asteroid belt. [ 10 ]
Apparent magnitude. 7.0–15 [7] Absolute magnitude (H) 11.16 [1] 433 Eros is a stony asteroid of the Amor group, and the first discovered, and second-largest near-Earth object. It has an elongated shape and a volume-equivalent diameter of approximately 16.8 kilometers (10.4 miles).