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Discovery and designation
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| Discovered by | Carolyn S. Shoemaker |
| Discovery site | Palomar |
| Discovery date | November 28, 1989 |
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Designations
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| MPC designation | 4503 |
| Alternate name(s) | 1989 WM |
| Epoch May 14, 2008 | |
| Ap | 4.119839081651711 |
| Peri | 1.276751900292541 |
| Eccentricity | .5268302139019768 |
| Orbital period | 1618.94721237509 |
| Mean anomaly | 38.26496314663858 |
| Inclination | 2.518628351514132 |
| Longitude of ascending node | 46.19489588919868 |
| Argument of peri | 76.18517175707456 |
| Absolute magnitude (H) | 15.6 |
4503 Cleobulus (1989 WM) is an Amor asteroid discovered on November 28, 1989 by Carolyn S. Shoemaker at Palomar.
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