| Orbital characteristics | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 2.669 AU |
| Eccentricity | 0.2579 |
| Orbital period | 4.36 years |
| Inclination | 12.97° |
| Physical characteristics | |
| Diameter | 240 km |
| Mass | 2.0×1019 kg |
| Density | ? g/cm3 |
| Rotation period | 7h 12m |
| Spectral class | S |
| Albedo | 0.16 |
| History | |
| Discoverer | K. Harding, 1804 |
3 Juno was the third asteroid to be discovered, in 1804 by K. Harding.