2920 Automedon

2920 Automedon
Discovery[1] and designation
Discovered by Edward L. G. Bowell
Discovery date May 3, 1981
Alternative names[1] 1981 JR
Minor planet
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
? 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.


* Discovery Circumstances: Numbered Minor Planets

* Orbital simulation from JPL (Java) / Ephemeris

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