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Discovery and designation
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| Discovered by | E. W. Elst and G. Pizarro |
| Discovery site | European Southern Observatory |
| Discovery date | December 17, 1987 |
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Designations
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| MPC designation | 12238 |
| Alternate name(s) | 1987 YU1 |
| Epoch May 14, 2008 | |
| Ap | 5.8130435 |
| Peri | 4.5228105 |
| Eccentricity | 0.1248308 |
| Orbital period | 4291.1430926 |
| Mean anomaly | 303.91812 |
| Inclination | 21.10299 |
| Longitude of ascending node | 227.58216 |
| Argument of peri | 176.70497 |
| Absolute magnitude (H) | 10.8 |
12238 Actor (1987 YU1) is a Jupiter Trojan discovered on December 17, 1987 by E. W. Elst and G. Pizarro at the European Southern Observatory.
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