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Discovery and designation
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| Discovered by | Y. Shimizu & T. Urata | |||||||||
| Discovery date | July 12, 1996 | |||||||||
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Designations
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| Alternate name(s) | 1996 NX, 1991 CM2, 1991 GM1 | |||||||||
| Epoch October 27, 2007 | ||||||||||
| Ap | 2.7140436 AU | |||||||||
| Peri | 2.4298774 AU | |||||||||
| Semi-major axis | 2.5719605 AU | |||||||||
| Eccentricity | 0.0552431 | |||||||||
| Orbital period | 1506.5893195 d | |||||||||
| Mean anomaly | 316.66482° | |||||||||
| Inclination | 14.01495° | |||||||||
| Longitude of ascending node | 271.35273° | |||||||||
| Argument of peri | 317.80995° | |||||||||
| Surface temp. Kelvin Celsius |
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| Spectral type | S-type asteroid[1] | |||||||||
| Absolute magnitude (H) | 12.7 | |||||||||
9986 Hirokun is an S-type main belt asteroid. It orbits the Sun once every 4.12 years.[2]
Discovered on July 12, 1996 by Y. Shimizu and T. Urata, it was given the provisional designation 1996 NX. It was later renamed 9986 Hirokun, after the fiancé of T. Urata's daughter.
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