516 Amherstia
Amherstia (minor planet designation: 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.
.png) A three-dimensional model of 516 Amherstia based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | Raymond Smith Dugan |
| Discovery date | 20 September 1903 |
| Designations | |
| (516) Amherstia | |
Named after | Amherst College |
| 1903 MG; 1938 YO | |
| Main belt | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 112.26 yr (41003 d) |
| Aphelion | 3.4103 AU (510.17 Gm) |
| Perihelion | 1.95161 AU (291.957 Gm) |
| 2.68094 AU (401.063 Gm) | |
| Eccentricity | 0.27204 |
| 4.39 yr (1603.4 d) | |
| 26.3259° | |
| 0° 13m 28.308s / day | |
| Inclination | 12.960° |
| 328.839° | |
| 257.966° | |
| Physical characteristics | |
| Dimensions | 73.1 km; 69.84 ± 4.38 km[2] |
Mean radius | 36.55±0.85 km [1] |
| Mass | (1.43 ± 1.33) × 1018 kg [2] 4.1×1017 kg |
Mean density | 2.0 g/cm³ |
| 0.312 d [3] 7.49 h (0.312 d) [1] | |
| 0.163–0.173 [4] 0.1627±0.008 [1] | |
| M-type asteroid | |
| 8.27 | |
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.[5]
References
- Yeomans, Donald K., "516 Amherstia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 8 May 2016.
- Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- 1 Archived 27 November 2005 at the Wayback Machine
- 2 Archived 16 December 2004 at the Wayback Machine
- Dotto, E.; et al. (June 1992), "M-type asteroids - Rotational properties of 16 objects", Astronomy and Astrophysics Supplement Series, 95 (2), pp. 195–211, Bibcode:1992A&AS...95..195D.
External links
- 516 Amherstia at AstDyS-2, Asteroids—Dynamic Site
- 516 Amherstia at the JPL Small-Body Database
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