(646) Kastalia Main-belt Asteroid
Discovered on 11 September 1907 by A. Kopff at Heidelberg.
Where Kastalia is today
Seen from above the solar system on 2026-10-14: Kastalia is 2.73 au from the Sun and 3.71 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 646 |
| Provisional designation | A907 RL |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.15 km (#6,429 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.269 |
| Rotation period | 3.13 hours |
| Absolute magnitude (H) | 12.63 |
| Orbital period | 3.54 years |
| Semi-major axis | 2.32 au |
| Perihelion – aphelion | 1.83 – 2.82 au |
| Eccentricity | 0.214 |
| Inclination | 6.91° |
| Closest distance between its orbit and Earth's (MOID) | 0.823 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.