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Discovery and designation
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| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | July 24, 1933 |
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Designations
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| MPC designation | 2158 |
| Named after | Friedrich Tietjen |
| Alternate name(s) | 1933 OS |
| Epoch May 14, 2008 | |
| Ap | 3.6314592 |
| Peri | 2.5047696 |
| Eccentricity | 0.1836127 |
| Orbital period | 1962.9342399 |
| Mean anomaly | 336.54191 |
| Inclination | 1.58333 |
| Longitude of ascending node | 187.42507 |
| Argument of peri | 102.99562 |
| Absolute magnitude (H) | 11.8 |
2158 Tietjen (1933 OS) is a main-belt asteroid discovered on July 24, 1933 by K. Reinmuth at Heidelberg.
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