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Discovery and designation
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| Discovered by | Yoshiaki Oshima |
| Discovery site | Gekko |
| Discovery date | January 28, 1989 |
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Designations
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| MPC designation | 4261 |
| Named after | Gekko Observatory |
| Alternate name(s) | 1989 BJ |
| Epoch May 14, 2008 | |
| Ap | 3.1097412 |
| Peri | 2.4760434 |
| Eccentricity | 0.1134483 |
| Orbital period | 1704.8246680 |
| Mean anomaly | 149.74465 |
| Inclination | 2.65427 |
| Longitude of ascending node | 265.79182 |
| Argument of peri | 102.69735 |
| Absolute magnitude (H) | 12.5 |
4261 Gekko (1989 BJ) is a main-belt asteroid discovered on January 28, 1989 by Yoshiaki Oshima at Gekko. It was named after the observatory at which it was discovered. The name means "moonlight". The observatory was founded in 1957 and belongs to the International Foundation for Cultural Harmony.
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