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3554 Amun
From Wikipedia, the free encyclopedia
| Discovery | |
|---|---|
| Discovered by: | Carolyn and Eugene Shoemaker |
| Discovery date: | March 4, 1986 |
| Alternative names: | 1986 EB |
| Minor planet category: | Aten asteroid, Venus-crosser asteroid |
| Orbital characteristics | |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion distance: | 186.532 Gm (1.247 AU) |
| Perihelion distance: | 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) |
| Avg. 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: | 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.
(6178) 1986 DA is another M-type near-Earth asteroid with lower inclination that is actually metallic.
| Minor planets | ||
|---|---|---|
| Previous minor planet | 3554 Amun | Next minor planet |
| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System.
For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.
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