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Designations
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| MPC designation | 20947 |
| Alternate name(s) | 2638 T-2 |
| Epoch May 14, 2008 | |
| Ap | 5.2521374 |
| Peri | 4.9822634 |
| Eccentricity | 0.0263693 |
| Orbital period | 4228.1177582 |
| Mean anomaly | 246.00809 |
| Inclination | 2.32835 |
| Longitude of ascending node | 52.41005 |
| Argument of peri | 31.68551 |
| Absolute magnitude (H) | 12.0 |
20947 Polyneikes (2638 T-2) is a Jupiter Trojan.
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