(1) Ceres Main-belt Asteroid
Discovered on 1 January 1801 by G. Piazzi at Palermo.
Where Ceres is today
Seen from above the solar system on 2026-10-14: Ceres is 2.66 au from the Sun and 2.44 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1 |
| Provisional designation | A801 AA |
| Orbit class | Main-belt Asteroid |
| Diameter | 939 km (#1 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0900 |
| Rotation period | 9.07 hours |
| Spectral type | G |
| Absolute magnitude (H) | 3.34 |
| Orbital period | 4.60 years |
| Semi-major axis | 2.77 au |
| Perihelion – aphelion | 2.55 – 2.99 au |
| Eccentricity | 0.0797 |
| Inclination | 10.6° |
| Closest distance between its orbit and Earth's (MOID) | 1.58 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.