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Discovery and designation
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| Discovered by | R. H. McNaught |
| Discovery site | Siding Spring |
| Discovery date | March 2, 1993 |
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Designations
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| MPC designation | 20043 |
| Named after | Dame Ellen MacArthur |
| Alternate name(s) | 1993 EM |
| Epoch May 14, 2008 | |
| Ap | 2.0829388 |
| Peri | 1.8550728 |
| Eccentricity | 0.0578632 |
| Orbital period | 1009.1806566 |
| Mean anomaly | 179.58274 |
| Inclination | 18.26378 |
| Longitude of ascending node | 264.55116 |
| Argument of peri | 286.01680 |
| Absolute magnitude (H) | 15.4 |
20043 Ellenmacarthur (1993 EM) is an inner main-belt asteroid discovered on March 2, 1993 by R. H. McNaught at Siding Spring. It is named after English sailor Ellen MacArthur.
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