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Discovery and designation
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| Discovered by | Poul Jensen |
| Discovery site | Brorfelde |
| Discovery date | February 25, 1987 |
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Designations
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| MPC designation | 4484 |
| Named after | Sif |
| Alternate name(s) | 1987 DD |
| Epoch May 14, 2008 | |
| Ap | 2.9024940 |
| Peri | 2.3657644 |
| Eccentricity | 0.1018799 |
| Orbital period | 1561.5432836 |
| Mean anomaly | 47.38108 |
| Inclination | 29.77983 |
| Longitude of ascending node | 85.10747 |
| Argument of peri | 0.00876 |
| Geometric albedo | 0.0562 |
| Absolute magnitude (H) | 12.10 |
4484 Sif (1987 DD) is a main-belt asteroid discovered on February 25, 1987 by Poul Jensen at Brorfelde.
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