3554 Amun
Orbit diagram of asteroid Amun with location as of September 9, 2012
|
|
| Discovery | |
|---|---|
| Discovered by |
Carolyn and Eugene Shoemaker |
| Discovery date | 4 March 1986 |
| Designations | |
| MPC designation | (3554) Amun |
|
Named after
|
Amun |
| 1986 EB | |
|
Aten asteroid, Venus-crosser asteroid |
|
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 10923 days (29.91 yr) |
| Aphelion | 1.24677 AU (186.514 Gm) |
| Perihelion | 0.700578 AU (104.8050 Gm) |
| 0.973675 AU (145.6597 Gm) | |
| Eccentricity | 0.28048 |
| 0.96 yr (350.9 d) | |
|
Average orbital speed
|
29.58 km/s |
| 184.781° | |
| 1.02585°/day | |
| Inclination | 23.3626° |
| 358.627° | |
| 359.392° | |
| Earth MOID | 0.250204 AU (37.4300 Gm) |
| Jupiter MOID | 4.18694 AU (626.357 Gm) |
| Jupiter Tisserand parameter | 6.106 |
| Physical characteristics | |
| Dimensions | 2.48 km |
|
Mean radius
|
1.24 ± 0.1 km |
| Mass | ~1.6×1013kg |
|
Mean density
|
2 ? g/cm³ |
|
Equatorial surface gravity
|
? m/s² |
|
Equatorial escape velocity
|
? km/s |
| 2.53001 h (0.105417 d) | |
| 0.1284 ± 0.024 | |
| Temperature | ~280 K |
| M-type asteroid | |
| 15.82 | |
3554 Amun is an M-type Aten asteroid (meaning it crosses Earth's orbit) and a Venus-crosser. It was discovered on 4 March 1986 by Carolyn and Eugene Shoemaker at Mount Palomar Observatory. Its estimated diameter is 2.48 kilometers, making it one of the smallest known M-type asteroids. Amun was the fifth Aten asteroid to be numbered.
Amun was once considered metallic, based on its M-type spectrum. In Mining the Sky, planetary scientist John S. Lewis calculated the value of 3554 Amun at $20 trillion.
(6178) 1986 DA is another M-type near-Earth asteroid with lower inclination that is actually metallic.
Amun passes closest to Venus, and in 1964, 2034, and 2103 comes within 10 Gm of it.
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