(4290) Heisei Main-belt Asteroid
Discovered on 30 October 1989 by T. Seki at Geisei.
Where Heisei is today
Seen from above the solar system on 2026-10-14: Heisei is 2.87 au from the Sun and 1.92 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4290 |
| Provisional designation | 1989 UK3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 17.3 km (#2,616 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.154 |
| Rotation period | 10.6 hours |
| Absolute magnitude (H) | 11.73 |
| Orbital period | 5.26 years |
| Semi-major axis | 3.02 au |
| Perihelion – aphelion | 2.74 – 3.31 au |
| Eccentricity | 0.0949 |
| Inclination | 8.49° |
| Closest distance between its orbit and Earth's (MOID) | 1.74 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 30 October 1989
- (4716) Urey
- (5479) Grahamryder
- (6306) Nishimura
- (9030) Othryoneus
- (10078) Stanthorpe
- (11282) Hanakusa
- (14380) Bussey