Orbit diagram of asteroid Amun with location as of September 9, 2012
|Discovered by||Carolyn and
|Discovery date||March 4, 1986|
|Alternative names||1986 EB|
|Minor planet category||Aten 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)|
|Orbital period||350.964 d (0.96 a)|
|Average orbital speed||29.58 km/s|
|Longitude of ascending node||358.680°|
|Argument of perihelion||359.368°|
|Mean density||2 ? g/cm³|
|Equatorial surface gravity||? m/s²|
|Escape velocity||? km/s|
|Rotation period||2.53 hr|
|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 2.48 kilometers, making it one of the smallest known M-type asteroids. Amun was the 5th Aten asteroid to be numbered.
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.
(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.
- "JPL Small-Body Database Browser: 3554 Amun (1986 EB)". Jet Propulsion Laboratory. 2014-02-19 last obs (arc=27.9 yr). Retrieved 2014-02-23.
- Book Review: Mining the Sky
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