Ceres, minor-planet designation 1 Ceres, is the only dwarf planet in the inner Solar System, and the largest asteroid. It is a rock–ice body 950 km (590 mi) in diameter, and the smallest identified dwarf planet. It contains about one third of the mass of the asteroid belt. Discovered on 1 January 1801 by Giuseppe Piazzi, it was the first asteroid to be identified, though it was classified as a planet at the time. It is named after Ceres, the Roman goddess of growing plants, the harvest, and motherly love.
The old astronomical symbol of Ceres is a sickle ,similar to Venus's symbol ♀, but with a gap in the upper circle (and with a variant under the influence of the initial 'C'); this was later replaced with the numbered disk ①.
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