(4231) Fireman Main-belt Asteroid
Discovered on 20 November 1976 by Harvard Observatory at Harvard.
Where Fireman is today
Seen from above the solar system on 2026-10-14: Fireman is 2.11 au from the Sun and 1.83 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4231 |
| Provisional designation | 1976 WD |
| Orbit class | Main-belt Asteroid |
| Diameter | 13.3 km (#3,615 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0437 |
| Rotation period | 340 hours |
| Absolute magnitude (H) | 13.39 |
| Orbital period | 3.40 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 2.11 – 2.41 au |
| Eccentricity | 0.0666 |
| Inclination | 8.60° |
| Closest distance between its orbit and Earth's (MOID) | 1.12 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.