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Discovery
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| Discovered by | Raymond Smith Dugan |
| Discovery date | September 20, 1903 |
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Designations
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| Named after | Amherst College |
| Alternate name(s) | 1903 MG; 1938 YO |
| Minor planet category |
Main belt |
| Epoch October 22, 2004 (JD 2453300.5) | |
| Aphelion | 510.608 Gm (3.413 AU) |
| Perihelion | 291.483 Gm (1.948 AU) |
| Semi-major axis | 401.045 Gm (2.681 AU) |
| Eccentricity | 0.273 |
| Orbital period | 1603.247 d (4.39 a) |
| Average orbital speed | 17.85 km/s |
| Mean anomaly | 139.799° |
| Inclination | 12.956° |
| Longitude of ascending node | 328.912° |
| Argument of perihelion | 258.439° |
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Physical characteristics
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| Dimensions | 73.1 km |
| Mass | 4.1×1017 kg |
| Mean density | 2.0 g/cm³ |
| Equatorial surface gravity | 0.0204 m/s² |
| Escape velocity | 0.0386 km/s |
| Rotation period | 0.312 d 1 |
| Albedo | 0.163–0.173 2 |
| Temperature | ~167 K |
| Spectral type | M-type asteroid |
| Absolute magnitude (H) | 8.27 |
516 Amherstia was the 8th asteroid discovered by Raymond Smith Dugan, and was named after Amherst College, his alma mater. Amherstia is a large M-type asteroid, with an estimated diameter of 73 km. It follows an eccentric orbit between Jupiter and Mars, with an orbital period of 4.39 years.
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