Among the Moon, Earth, Comet Halley, the dwarf planet Ceres, and Asteroid 12343, Comet Halley has the most non-circular orbit. Comet Halley's orbit is highly elliptical, taking it close to the Sun and then far out into the solar system, which is characteristic of many comets. In contrast, the orbits of the Moon, Earth, Ceres, and most asteroids, including Asteroid 12343, are more circular and less eccentric.
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