Dwarf Planets
Among the dwarf planets, it is 90 percent certain that Ceres has no moons larger than 1 km in size, assuming that they would have the same albedo as Ceres itself.
Pluto has five known moons. Its largest moon Charon is more than half as large as Pluto itself, and large enough to orbit a point outside Pluto's surface. In effect, each orbits the other, forming a binary system informally referred to as a double dwarf planet. Pluto's four other moons, Nix, Hydra, S/2011 P 1, and S/2012 P 1, are far smaller and orbit the Pluto–Charon system.
Makemake has no known moons. A satellite having 1% Makemake's brightness would have been detected if it had been located at an angular distance from Makemake farther than 0.4 arcseconds (0.0001 degrees; 2 microradians).
Eris has one known moon, Dysnomia. Its radius, based on its brightness, is estimated to be 50 to 125 km.
Haumea has two moons with radii estimated around 155 km (Hiʻiaka) and 85 km (Namaka).
Read more about this topic: Minor-planet Moon
Famous quotes containing the words dwarf and/or planets:
“When I lie down to love,
old dwarf heart shakes her head.
Like an imbecile she was born old.”
—Anne Sexton (1928–1974)
“Marriage is the clue to human life, but there is no marriage apart from the wheeling sun and the nodding earth, from the straying of the planets and the magnificence of the fixed stars.”
—D.H. (David Herbert)