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| Orbital characteristics | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 2.767 AU |
| Eccentricity | 0.0789 |
| Orbital period | 4.60 Years |
| Inclination | 10.58° |
| Physical characteristics | |
| Diameter | 940-1,003 km |
| Mass | 8.7×1020 kg |
| Density | 2.7 g/cm3 |
| Rotation period | 9h 4m |
| Spectral class | C |
| Albedo | 0.073 |
| History | |
| Discoverer | G. Piazzi, 1801 |
1 Ceres (asteroid 1 -- See-reez) was the first asteroid to be discovered, with a diameter of 1003 km, and a surface area of 1,800,000 km2. It was discovered on January 1, 1801, by Giuseppe Piazzi, and originally named Ceres Ferdinandea after the Classical Greek and Sicilian goddess of plants and motherly love and King Ferdinand IV of Naples and Sicily. The Ferdinandea part was dropped for political reasons.
Ceres is the largest known asteroid in the traditional asteroid belt between Mars and Jupiter. However, the Kuiper belt is now known to contain at least two larger objects, 28978 Ixion and 50000 Quaoar.
With a mass of 8.7×1020kg, Ceres comprises over one-third the 2.3×1021 kg estimated total mass of all the asteroids.
The chemical element Cerium (atomic number 58) was discovered in 1803, two years after Ceres was discovered, and has been named after the asteroid.
