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Discovery and designation
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| Discovered by | Endate, K., Watanabe, K. |
| Discovery site | Kitami |
| Discovery date | January 26, 1990 |
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Designations
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| MPC designation | 6390 |
| Alternate name(s) | 1990 BG1 |
| Epoch May 14, 2008 | |
| Ap | 3.3930861 |
| Peri | 2.3668019 |
| Eccentricity | 0.1781778 |
| Orbital period | 1785.1490771 |
| Mean anomaly | 248.59873 |
| Inclination | 6.07727 |
| Longitude of ascending node | 75.30058 |
| Argument of peri | 79.51176 |
| Absolute magnitude (H) | 12.4 |
6390 Hirabayashi (1990 BG1) is a main-belt asteroid discovered on January 26, 1990 by Endate, K., Watanabe, K. at Kitami.
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