| Name | Year of discovery |
Mean distance from sun (millions of miles) |
Orbital period (years) |
Diameter (miles) |
Magnitude | |
|---|---|---|---|---|---|---|
| 1. Ceres | 1801 | 257.0 | 4.60 | 485 | 7.4 | |
| 2. Pallas | 1802 | 257.4 | 4.61 | 304 | 8.0 | |
| 3. Juno | 1804 | 247.8 | 4.36 | 118 | 8.7 | |
| 4. Vesta | 1807 | 219.3 | 3.63 | 243 | 6.5 | |
| 5. Astraea | 1845 | 239.3 | 4.14 | 50 | 9.9 | |
| 6. Hebe | 1847 | 225.2 | 3.78 | 121 | 8.5 | |
| 7. Iris | 1847 | 221.4 | 3.68 | 121 | 8.4 | |
| 8. Flora | 1847 | 204.4 | 3.27 | 56 | 8.9 | |
| 9. Metis | 1848 | 221.7 | 3.69 | 78 | 8.9 | |
| 10. Hygeia | 1849 | 222.6 | 5.59 | 40(?) | 9.5 | |
| Ida and its Moon Dactyl | Gaspra |
|---|---|
| Braille | Castalia |
| Eros | Geographos |
| Mathilde | Toutatis |