2920 Automedon
| Discovery | |
|---|---|
| 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) | |
Average orbital speed | 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
- ↑ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
- ↑ "2920 Automedon (1981 JR)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 April 2016.
- ↑ 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
- Discovery Circumstances: Numbered Minor Planets
- Orbital simulation from JPL (Java)
- Ephemeris
- 2920 Automedon at the JPL Small-Body Database
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