Päikesesüsteemi taevakeha, mis (a) tiirleb ümber Päikese, (b) omab piisavalt massi, et omandada gravitatsiooni mõjul enam-vähem ümmargune kuju, (c) ei ole puhastanud oma orbiidi ümbrust väikekehadest, (d) ei ole satelliit
celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite
Это интересно
See also: Clark R. Chapman, 'Dwarf planet', Encyclopaedia Britannica, https://www.britannica.com/topic/dwarf-planet [15.6.2017]
So far, the IAU has only recognized five dwarf planets. In order of distance from the Sun they are: Ceres, Pluto, Haumea, Makemake, and Eris. But the IAU says there may be many more dwarf planets – perhaps more than a hundred – waiting to be discovered.
