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Discovery and designation
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| Discovered by | Jensen, P. |
| Discovery site | Brorfelde |
| Discovery date | September 25, 1987 |
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Designations
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| MPC designation | 3990 |
| Named after | Heimdall |
| Alternate name(s) | 1987 SO3 |
| Epoch May 14, 2008 | |
| Ap | 4.8822947 |
| Peri | 2.9970567 |
| Eccentricity | 0.2392631 |
| Orbital period | 2856.2034836 |
| Mean anomaly | 200.35736 |
| Inclination | 9.50117 |
| Longitude of ascending node | 192.82780 |
| Argument of peri | 199.76156 |
| Absolute magnitude (H) | 10.4 |
3990 Heimdal (1987 SO3) is an outer main-belt asteroid discovered on September 25, 1987 by Jensen, P. at Brorfelde.
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