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Discovery and designation
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| Discovered by | R. H. McNaught |
| Discovery site | Siding Spring |
| Discovery date | September 24, 1990 |
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Designations
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| MPC designation | 4678 |
| Alternate name(s) | 1990 SS4 |
| Epoch May 14, 2008 | |
| Ap | 2.7495119 |
| Peri | 1.7804525 |
| Eccentricity | 0.2139221 |
| Orbital period | 1245.0752949 |
| Mean anomaly | 57.80671 |
| Inclination | 3.74171 |
| Longitude of ascending node | 30.52826 |
| Argument of peri | 322.98698 |
| Absolute magnitude (H) | 14.0 |
4678 Ninian (1990 SS4) is a main-belt asteroid discovered on September 24, 1990 by R. H. McNaught at Siding Spring.
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