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Discovery and designation
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| Discovered by | R. H. McNaught |
| Discovery site | Siding Spring Observatory |
| Discovery date | September 30, 1991 |
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Designations
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| MPC designation | 14420 |
| Alternate name(s) | 1991 SM |
| Epoch May 14, 2008 | |
| Ap | 3.3506785 |
| Peri | 2.6733013 |
| Eccentricity | 0.1124468 |
| Orbital period | 1909.3198250 |
| Mean anomaly | 69.43816 |
| Inclination | 11.20983 |
| Longitude of ascending node | 122.43671 |
| Argument of peri | 220.90024 |
| Absolute magnitude (H) | 12.2 |
14420 Massey (1991 SM) is a main-belt asteroid discovered on September 30, 1991 by R. H. McNaught at Siding Spring Observatory.
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