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Discovery and designation
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| Discovered by | Atsushi Takahashi and Kazuro Watanabe |
| Discovery site | Kitami |
| Discovery date | September 16, 1990 |
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Designations
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| MPC designation | 4644 |
| Named after | Ōmu |
| Alternate name(s) | 1990 SR3 |
| Epoch May 14, 2008 | |
| Aphelion | 2.9805848 |
| Perihelion | 2.2323522 |
| Eccentricity | 0.1435338 |
| Orbital period | 1537.0115585 |
| Mean anomaly | 156.57813 |
| Inclination | 14.15337 |
| Longitude of ascending node | 48.30868 |
| Argument of perihelion | 205.55545 |
| Absolute magnitude (H) | 12.1 |
4644 Oumu (1990 SR3) is a main-belt asteroid discovered on September 16, 1990 by Atsushi Takahashi and Kazuro Watanabe at Kitami Observatory.
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