Class S

Ultragiant planets are Super Gas Giants or brown dwarfs. Their diameters range in size from 10 to 50 million km (Class S) and 50 to 120 million km (Class T). Any larger and they would be classified as stars. They radiate considerable heat and generate enormous amounts of gravity, often harboring hundreds or even thousands of moons. In most cases, these moons would be subject to considerable tidal forces and gravitational effects caused by their parent planet - oceans or other large bodies of water would experience gigantic waves and powerful currents.