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Discovery and designation
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| Discovered by | J. A. Bruwer |
| Discovery site | Johannesburg (UO) |
| Discovery date | July 13, 1953 |
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Designations
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| MPC designation | 3284 |
| Named after | Reinhold Niebuhr |
| Alternate name(s) | 1953 NB |
| Epoch May 14, 2008 | |
| Ap | 3.8322836 |
| Peri | 1.6995340 |
| Eccentricity | 0.3855423 |
| Orbital period | 1680.1776284 |
| Mean anomaly | 314.13355 |
| Inclination | 6.66810 |
| Longitude of ascending node | 73.62263 |
| Argument of peri | 259.30155 |
| Absolute magnitude (H) | 12.9 |
3284 Niebuhr (1953 NB) is a main-belt asteroid discovered on July 13, 1953 by J. A. Bruwer at Johannesburg (UO).
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