A minor-planet moon is an astronomical body that orbits a minor planet as its natural satellite. It is thought that many asteroids and Kuiper belt objects may possess moons, in some cases quite substantial in size. Discoveries of minor-planet moons (and binary objects, in general) are important because the determination of their orbits provides estimates on the mass and density of the primary, allowing insights of their physical properties that is generally not otherwise possible. As of November 2011, there are over 200 minor planets known to have moons.
Read more about Minor-planet Moon: Terminology, Discovery Milestones, Commonality, Origin, Populations, Dwarf Planets
Famous quotes containing the word moon:
“I’ve no time now, but believe me as surely as the moon will set and the sun will rise I shall kill you tomorrow night. I shall kill you even if you hide in the deepest cave of the earth. At ten o’clock tomorrow night, I shall kill you.”
—R.C. Sherriff (1896–1975)