2920 Automedon
2920 Automedon /ɔːˈtɒmɪdɒn/ is a large Jupiter trojan from the Greek camp, approximately 110 kilometers (68 miles) in diameter. It was discovered by American astronomer Edward Bowell at the Anderson Mesa station of the Lowell Observatory on 3 May 1981. The dark D-type asteroid has a rotation period of 10.22 hours and belongs to the 30 largest Jupiter trojans. It was named after the ancient Greek hero Automedon, the charioteer of Achilles.
| Discovery | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 3 May 1981 |
| Designations | |
MPC designation | (2920) Automedon |
| Pronunciation | /ɔːˈtɒmɪdɒn/ |
Named after | Automedon (Greek mythology) |
Alternative designations | 1981 JR |
Minor planet category | Jupiter trojan Greek · background |
| Adjectives | Automedontian |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 36.97 yr (13,502 d) |
| Aphelion | 5.2417 AU |
| Perihelion | 4.9742 AU |
Semi-major axis | 5.1079 AU |
| Eccentricity | 0.0262 |
Orbital period (sidereal) | 11.54 yr (4,217 d) |
Mean anomaly | 221.03° |
Mean motion | 0° 5m 7.44s / day |
| Inclination | 21.121° |
Longitude of ascending node | 230.94° |
| 197.70° | |
| Jupiter MOID | 0.0311 AU |
| TJupiter | 2.8670 |
| Physical characteristics | |
Mean diameter | 88.57±1.80 km 111.01±7.5 km 113.11±2.25 km |
Synodic rotation period | 10.212±0.002 h 10.220±0.004 h 10.223±0.003 h |
| 0.042±0.002 0.0433±0.007 0.068±0.009 | |
| D (SMASS-1) C (assumed) V–I = 0.950±0.015 | |
| 8.59±0.21 8.80 | |
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