(651) Antikleia Main-belt Asteroid
Discovered on 4 October 1907 by A. Kopff at Heidelberg.
Where Antikleia is today
Seen from above the solar system on 2026-10-14: Antikleia is 3.22 au from the Sun and 3.87 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 651 |
| Provisional designation | A907 TK |
| Orbit class | Main-belt Asteroid |
| Diameter | 31.9 km (#1,282 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.172 |
| Rotation period | 20.3 hours |
| Spectral type | S |
| Absolute magnitude (H) | 10.13 |
| Orbital period | 5.25 years |
| Semi-major axis | 3.02 au |
| Perihelion – aphelion | 2.72 – 3.33 au |
| Eccentricity | 0.100 |
| Inclination | 10.8° |
| Closest distance between its orbit and Earth's (MOID) | 1.72 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.