516 Amherstia
From Infogalactic: the planetary knowledge core
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A three-dimensional model of 516 Amherstia based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | Raymond Smith Dugan |
| Discovery date | September 20, 1903 |
| Designations | |
|
Named after
|
Amherst College |
| 1903 MG; 1938 YO | |
| 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) |
| 401.045 Gm (2.681 AU) | |
| Eccentricity | 0.273 |
| 1603.247 d (4.39 a) | |
|
Average orbital speed
|
17.85 km/s |
| 139.799° | |
| Inclination | 12.956° |
| 328.912° | |
| 258.439° | |
| Physical characteristics | |
| Dimensions | 73.1 km; 69.84 ± 4.38[2] km |
| Mass | (1.43 ± 1.33) × 1018[2] kg 4.1×1017 kg[citation needed] |
|
Mean density
|
2.0 g/cm³ |
| 0.0204 m/s² | |
| 0.0386 km/s | |
| 0.312 d 1 | |
| Albedo | 0.163–0.173 2 |
| Temperature | ~167 K |
|
Spectral type
|
M-type asteroid |
| 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.
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
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