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Discovery and designation
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| Discovery date | , |
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Designations
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| MPC designation | 2209 |
| Named after | Tianjin |
| Alternate name(s) | 1978 US1 |
| Epoch May 14, 2008 | |
| Ap | 3.0360645 |
| Peri | 2.6574349 |
| Eccentricity | 0.0665021 |
| Orbital period | 1754.3746795 |
| Mean anomaly | 37.39042 |
| Inclination | 2.61098 |
| Longitude of ascending node | 151.01481 |
| Argument of peri | 264.52934 |
| Geometric albedo | 0.2854 |
| Absolute magnitude (H) | 10.90 |
2209 Tianjin (1978 US1) is a main-belt asteroid discovered on October 28, 1978 at the Purple Mountain Observatory.
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