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Discovery and designation
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| Discovered by | R. H. McNaught |
| Discovery site | Siding Spring |
| Discovery date | March 10, 1991 |
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Designations
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| MPC designation | 20002 |
| Named after | Tilly Smith |
| Alternate name(s) | 1991 EM |
| Epoch May 14, 2008 | |
| Ap | 3.6362691 |
| Peri | 2.7501491 |
| Eccentricity | 0.1387507 |
| Orbital period | 2084.2004234 |
| Mean anomaly | 246.02267 |
| Inclination | 20.22391 |
| Longitude of ascending node | 280.59692 |
| Argument of peri | 27.51202 |
| Absolute magnitude (H) | 13.8 |
20002 Tillysmith (1991 EM) is a main-belt asteroid discovered on March 10, 1991 by R. H. McNaught at Siding Spring. It is named after Tilly Smith who saved over one hundred people by recognising the receding water and frothing bubbles of an oncoming Tsunami during the 2004 Indian Ocean earthquake.[1]
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