3554 Amun
|
Discovery
|
|
|---|---|
| Discovered by | Carolyn and Eugene Shoemaker |
| Discovery date | March 4, 1986 |
|
Designations
|
|
| Named after | Amun |
| Alternate name(s) | 1986 EB |
| Minor planet category |
Aten asteroid, Venus-crosser asteroid |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 186.532 Gm (1.247 AU) |
| Perihelion | 104.807 Gm (0.701 AU) |
| Semi-major axis | 145.669 Gm (0.974 AU) |
| Eccentricity | 0.281 |
| Orbital period | 350.964 d (0.96 a) |
| Average orbital speed | 29.58 km/s |
| Mean anomaly | 196.415° |
| Inclination | 23.363° |
| Longitude of ascending node | 358.680° |
| Argument of perihelion | 359.368° |
|
Physical characteristics
|
|
| Dimensions | 2.5 ? km |
| Mass | ~1.6×1013 kg |
| Mean density | 2 ? g/cm³ |
| Equatorial surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | 0.1054 d 1 |
| Albedo | ? 2 |
| Temperature | ~280 K |
| Spectral type | M-type asteroid |
| Absolute magnitude (H) | 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 2.5 kilometers, making it one of the smallest known M-type asteroids.
Amun was once considered metallic, based on its M-type spectrum. However, like the asteroids 22 Kalliope and 21 Lutetia, the radar albedo of the object is inconsistent with a metallic composition. In Mining the Sky, planetary scientist John S. Lewis calculated the value of 3554 Amun at $20 trillion dollars [1].
(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. [2]
[edit] External links
|
|||||
|
||||||||||||||||||||||
 |
This near-Earth asteroid-related article is a stub. You can help Wikipedia by expanding it. |
