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Discovery and designation
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| Discovered by | Tsuneo Niijima and Takeshi Urata |
| Discovery site | Ojima |
| Discovery date | December 20, 1986 |
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Designations
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| MPC designation | 4574 |
| Named after | Minamoto no Yoshinaka |
| Alternate name(s) | 1986 YB |
| Epoch May 14, 2008 | |
| Ap | 3.2918238 |
| Peri | 2.7116800 |
| Eccentricity | 0.0966342 |
| Orbital period | 1899.5932021 |
| Mean anomaly | 74.47837 |
| Inclination | 8.69915 |
| Longitude of ascending node | 280.17904 |
| Argument of peri | 105.71644 |
| Absolute magnitude (H) | 11.6 |
4574 Yoshinaka (1986 YB) is a main-belt asteroid discovered on December 20, 1986 by Tsuneo Niijima and Takeshi Urata at Ojima.
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