113 Amalthea
| Discovery | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | March 12, 1871 |
| Designations | |
|
Named after
|
Amalthea |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 386.645 Gm (2.585 AU) |
| Perihelion | 324.208 Gm (2.167 AU) |
| 355.426 Gm (2.376 AU) | |
| Eccentricity | 0.088 |
| 1337.627 d (3.66 a) | |
|
Average orbital speed
|
19.29 km/s |
| 4.657° | |
| Inclination | 5.037° |
| 123.592° | |
| 79.051° | |
| Physical characteristics | |
| Dimensions | 46.1 km |
| Mass | 1.0×1017 kg |
| 0.0129 m/s² | |
| 0.0244 km/s | |
| Temperature | ~181 K |
|
Spectral type
|
S |
| 8.74 | |
113 Amalthea is a fairly typical rocky main-belt asteroid orbiting in the inner regions of the belt. It was discovered by R. Luther on March 12, 1871. The name comes from Amalthea of Greek mythology. One of Jupiter's inner small satellites, unrelated to 113 Amalthea, is also called Amalthea, as is an (apparently fictional) small Arjuna asteroid in Neal Stephenson's 2015 novel Seveneves.
Amalthea is thought to be a fragment from the mantle of a Vesta-sized, 300–600 km diameter parent body that broke up around one billion years ago, with the other major remnant being 9 Metis.[2] The spectrum of 113 Amalthea reveals the presence of the mineral olivine, a relative rarity in the asteroid belt.[3][4]
References
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