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Discovery and designation
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| Discovered by | E. W. Elst |
| Discovery site | European Southern Observatory |
| Discovery date | October 7, 1989 |
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Designations
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| MPC designation | 8489 |
| Named after | Boulder |
| Alternate name(s) | 1989 TA3 |
| Epoch May 14, 2008 | |
| Ap | 3.5097656 |
| Peri | 2.7775972 |
| Eccentricity | 0.1164508 |
| Orbital period | 2035.8990072 |
| Mean anomaly | 253.65428 |
| Inclination | 5.83549 |
| Longitude of ascending node | 147.40350 |
| Argument of peri | 91.50733 |
| Absolute magnitude (H) | 13.6 |
8489 Boulder (1989 TA3) is a main-belt asteroid discovered on October 7, 1989 by E. W. Elst at the European Southern Observatory.
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