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Discovery and designation
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| Discovered by | H. van Gent |
| Discovery site | Johannesburg (LS) |
| Discovery date | September 28, 1935 |
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Designations
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| MPC designation | 2945 |
| Named after | Herman Zanstra |
| Alternate name(s) | 1935 ST1 |
| Epoch May 14, 2008 | |
| Ap | 3.0428473 |
| Peri | 2.2926591 |
| Eccentricity | 0.1406030 |
| Orbital period | 1591.5376176 |
| Mean anomaly | 262.38343 |
| Inclination | 2.62742 |
| Longitude of ascending node | 95.92190 |
| Argument of peri | 243.14058 |
| Geometric albedo | 0.0522 |
| Absolute magnitude (H) | 12.20 |
2945 Zanstra (1935 ST1) is a main-belt asteroid discovered on September 28, 1935 by H. van Gent at Johannesburg (LS).
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