2920 Automedon
|
Discovery[1] and designation
|
| Discovered by |
Edward L. G. Bowell |
| Discovery date |
May 3, 1981 |
|
Designations
|
| Alternative names[1] |
1981 JR |
Minor planet
category |
Jupiter Trojan |
|
Orbital characteristics[2]
|
| Epoch February 04, 2008 (JD 2454500.5) |
| Aphelion |
785.896 Gm (5.253 AU) |
| Perihelion |
743.603 Gm (4.971 AU) |
| Semi-major axis |
764.750 Gm (5.112 AU) |
| Eccentricity |
0.028 |
| Orbital period |
4221.719 d (11.56 a) |
| Average orbital speed |
13.17 km/s |
| Mean anomaly |
266.253° |
| Inclination |
21.119° |
| Longitude of ascending node |
230.955° |
|
Physical characteristics
|
| Dimensions |
111.0 km |
| Mass |
1.4×1018 kg |
| Mean density |
2.0 g/cm³ |
| Equatorial surface gravity |
0.0310 m/s² |
| Equatorial escape velocity |
0.0587 km/s |
Sidereal rotation
period |
? d |
| Axial tilt |
?° |
| Pole ecliptic latitude |
? |
| Pole ecliptic longitude |
? |
| Geometric albedo |
0.10 |
| Temperature |
~123 K |
| Spectral type |
? |
| Absolute magnitude |
8.8 |
2920 Automedon is a Jupiter trojan asteroid that orbits in the L4 Lagrangian point of the Sun-Jupiter system, in the "Greek Camp" of Trojan asteroids. It was named after the Greek hero Automedon, who fought during the Trojan War. It was discovered by Edward L. G. Bowell at the Anderson Mesa station of the Lowell Observatory on May 3, 1981.
Links
* Discovery Circumstances: Numbered Minor Planets
* Orbital simulation from JPL (Java) / Ephemeris