2920 Automedon

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2920 Automedon
Discovery[1]
Discovered by Edward L. G. Bowell
Discovery date 3 May 1981
Designations
Named after
Automedon
1981 JR
Jupiter Trojan
Orbital characteristics[1][2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 12733 days (34.86 yr)
Aphelion 5.24137 AU (784.098 Gm)
Perihelion 4.97474 AU (744.211 Gm)
5.10806 AU (764.155 Gm)
Eccentricity 0.026099
11.54 yr (4216.79 d)
13.17 km/s
151.092°
0° 5m 7.343s / day
Inclination 21.1241°
230.951°
199.244°
Earth MOID 3.99006 AU (596.904 Gm)
Jupiter MOID 0.0261987 AU (3.91927 Gm)
Jupiter Tisserand parameter 2.866
Physical characteristics
Dimensions 111.0 km
Mean radius
55.505 ± 3.75 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
10.212 h (0.4255 d)
0.0433 ± 0.007
Temperature ~123 K
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.

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.[3]

References[edit]

  1. ^ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory. 
  2. ^ "2920 Automedon (1981 JR)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 April 2016. 
  3. ^ 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. 

External links[edit]