Dwarf planets

Dwarf planets

Table
Dwarf planets
name mean distance from Sun (AU) orbital period (years) diameter (km) year of discovery notable features
Official dwarf planets*
Ceres    2.77        4.61 980 × 910 1801 largest known asteroid; first asteroid discovered
Pluto   39.5     247.69 2,344 1930 has three moons
Haumea   43.19     283.84 980 × 750 × 500 2003 rotates every 3.9 hours; has elongated shape
Makemake   45.48     306.17 1,500 2005 reddish in colour
Eris   67.84     558.77 2,600 2003 surface coated with methane ice
Notable candidate dwarf planets
Orcus   39.22     245.62 946 2004 named after Roman god of the underworld
2003 AZ84   39.36     246.94 686 2003 has one moon
Ixion   39.70     250.18 650 2001 named after Greek mythological king sentenced to roll a wheel through the underworld
90568 (2004 GV9)   42.10     273.13 677 2004 discovered by U.S. robotic telescopes (telescope) searching for near-Earth asteroids
55636 (2002 TX300)   43.28     284.69 <800 2002 possible fragment formed from collision with Haumea
Quaoar   43.61     287.97 844 2002 named after the creator god of the Tongva Indians
55565 (2002 AW197)   47.12     323.49 735 2002 discovered by U.S. astronomers at Palomar Observatory
Sedna 488.98 10,812.82 <1,600 2003 has extremely eccentric orbit that takes it as far as 975 AU from the Sun
*As defined by the International Astronomical Union (information processing).
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