(5261) Eureka Mars-crossing Asteroid
Discovered on 20 June 1990 by Levy, D. H., Holt, H. E. at Palomar.
Where Eureka is today
Seen from above the solar system on 2026-10-14: Eureka is 1.46 au from the Sun and 0.564 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5261 |
| Provisional designation | 1990 MB |
| Orbit class | Mars-crossing Asteroid |
| Diameter | 1.88 km (#17,165 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.182 |
| Rotation period | 2.69 hours |
| Spectral type | Sr |
| Absolute magnitude (H) | 16.1 |
| Orbital period | 1.88 years |
| Semi-major axis | 1.52 au |
| Perihelion – aphelion | 1.42 – 1.62 au |
| Eccentricity | 0.0648 |
| Inclination | 20.3° |
| Closest distance between its orbit and Earth's (MOID) | 0.498 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.