2920 Automedon

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2920 Automedon
Discovery[1] and designation
Discovered by Edward L. G. Bowell
Discovery date May 3, 1981
Named after
1981 JR
Minor planet category Jupiter Trojan
Orbital characteristics[2]
Epoch February 4, 2008 (JD 2454500.5)
Aphelion 785.896 Gm (5.253 AU)
Perihelion 743.603 Gm (4.971 AU)
764.750 Gm (5.112 AU)
Eccentricity 0.028
4221.719 d (11.56 a)
13.17 km/s
Inclination 21.119°
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
Temperature ~123 K

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.

Photometric observations of this asteroid during 1994 were used to build a light curve showing a rotation period of 10.220 ± 0.004 hours with a brightness variation of 0.12 ± 0.01 magnitude.[1]


  1. ^ Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; Hahn, Gerhard; Schober, Hans-Josef; Lahulla, Felix; Delbò, Marco; Lagerkvist, Claes-Ingvar (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal 141 (5): 170. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.  edit

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