(5621) Erb Mars-crossing Asteroid
Discovered on 23 September 1990 by K. J. Lawrence at Palomar.
Where Erb is today
Seen from above the solar system on 2026-10-14: Erb is 3.13 au from the Sun and 2.92 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5621 |
| Provisional designation | 1990 SG4 |
| Orbit class | Mars-crossing Asteroid |
| Diameter | 3.30 km (#14,471 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.425 |
| Rotation period | 8.03 hours |
| Absolute magnitude (H) | 14.29 |
| Orbital period | 3.49 years |
| Semi-major axis | 2.30 au |
| Perihelion – aphelion | 1.41 – 3.19 au |
| Eccentricity | 0.386 |
| Inclination | 5.55° |
| Closest distance between its orbit and Earth's (MOID) | 0.396 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.