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Discovery and designation
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| Discovered by | Tetsuya Fujii and Kazuro Watanabe |
| Discovery site | Kitami |
| Discovery date | September 16, 1990 |
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Designations
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| MPC designation | 4645 |
| Alternate name(s) | 1990 SP4 |
| Epoch May 14, 2008 | |
| Ap | 3.0297251 |
| Peri | 2.3133991 |
| Eccentricity | 0.1340650 |
| Orbital period | 1594.9472779 |
| Mean anomaly | 276.27203 |
| Inclination | 9.45944 |
| Longitude of ascending node | 179.85424 |
| Argument of peri | 293.56772 |
| Geometric albedo | 0.1622 |
| Absolute magnitude (H) | 12.00 |
4645 Tentaikojo (1990 SP4) is a main-belt asteroid discovered on September 16, 1990 by Tetsuya Fujii and Kazuro Watanabe at Kitami Observatory.
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