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Discovery and designation
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| Discovered by | Tsutomu Seki |
| Discovery site | Geisei |
| Discovery date | October 30, 1989 |
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Designations
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| MPC designation | 4290 |
| Named after | Heisei period |
| Alternate name(s) | 1989 UK3 |
| Epoch May 14, 2008 | |
| Ap | 3.3196379 |
| Peri | 2.7255859 |
| Eccentricity | 0.0982680 |
| Orbital period | 1919.4288803 |
| Mean anomaly | 228.07153 |
| Inclination | 8.49677 |
| Longitude of ascending node | 244.13603 |
| Argument of peri | 91.05068 |
| Absolute magnitude (H) | 11.5 |
4290 Heisei (1989 UK3) is a main-belt asteroid discovered on October 30, 1989 by Tsutomu Seki at Geisei.
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