(4380) Geyer Main-belt Asteroid
Discovered on 14 August 1988 by E. W. Elst at Haute Provence.
Where Geyer is today
Seen from above the solar system on 2026-10-14: Geyer is 2.88 au from the Sun and 2.42 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4380 |
| Provisional designation | 1988 PB2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 16.9 km (#2,697 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.129 |
| Rotation period | 9.41 hours |
| Absolute magnitude (H) | 12.1 |
| Orbital period | 5.30 years |
| Semi-major axis | 3.04 au |
| Perihelion – aphelion | 2.85 – 3.23 au |
| Eccentricity | 0.0625 |
| Inclination | 9.88° |
| Closest distance between its orbit and Earth's (MOID) | 1.86 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.