516 Amherstia
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| Discovery | |
|---|---|
| Discovered by | Raymond Smith Dugan |
| Discovery date | September 20, 1903 |
| Designations | |
| Named after | Amherst College |
| Alternative names | 1903 MG; 1938 YO |
| Minor planet category | Main belt |
| Orbital characteristics[1] | |
| 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° |
| Physical characteristics | |
| Dimensions | 69.84 ± 4.38[2] km |
| Mass | (1.43 ± 1.33) × 1018[2] kg |
| 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 |
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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.
In 1989, the asteroid was observed from the Collurania-Teramo Observatory, allowing a light curve to be produced that showed an estimated rotation period of 7.49 hours and a brightness variation of 0.25 ± 0.01 in magnitude.[3]
References
- ↑ Yeomans, Donald K., "516 Amherstia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25.
- ↑ 2.0 2.1 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98-118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ Dotto, E. et al. (June 1992), "M-type asteroids - Rotational properties of 16 objects", Astronomy and Astrophysics Supplement Series 95 (2): 195–211, Bibcode:1992A&AS...95..195D.
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