Quaoar

Overview: Quaoar is a large classical Kuiper Belt Object (KBO) discovered in 2002. It is named after the creation deity of the Tongva people of California. Quaoar represents one of the first large KBOs found beyond Pluto, sparking renewed interest in dwarf planets.

Discovery: Quaoar was discovered on June 4, 2002, by astronomers Chad Trujillo and Michael E. Brown at the Palomar Observatory.

Orbit: Quaoar orbits the Sun at a distance of roughly 43 AU, with an orbital period of about 286 Earth years. Its orbit is relatively circular (eccentricity ~0.04) and moderately inclined (~8°), making it a “classical” or “cubewano” KBO, meaning it is not strongly influenced by Neptune’s gravity.

Size and Composition: Quaoar has an estimated diameter of about 1,100 km, placing it in the range of possible dwarf planets. Its surface shows a mix of water ice and crystalline ice, along with methane and possibly ethane, which suggests a chemically diverse environment. Its reddish color is indicative of organic tholins on the surface.

Satellite: Quaoar has a small moon, Weywot, discovered in 2007. The moon’s orbit allows astronomers to calculate Quaoar’s mass and density, which suggests a mixed ice-rock interior.

Interesting Notes: Quaoar is notable for its relatively bright and icy surface compared to other Kuiper Belt objects. Its combination of size, composition, and orbit makes it a prime candidate for future study of early solar system evolution.