4057 Demophon
4057 Demophon /ˈdɛməfɒn/ is a larger Jupiter trojan from the Greek camp, approximately 46 kilometers (29 miles) in diameter. It was discovered on 15 October 1985 by American astronomer Edward Bowell at the Anderson Mesa Station of the Lowell Observatory near Flagstaff, Arizona. The dark Jovian asteroid has a longer-than-average rotation period of 29.8 hours. It was named after the Athen prince Demophon who fought in the Trojan War.
| Discovery | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 15 October 1985 |
| Designations | |
MPC designation | (4057) Demophon |
| Pronunciation | /ˈdɛməfɒn/ |
Named after | Demophon of Athens (Greek mythology) |
Alternative designations | 1985 TQ |
Minor planet category | Jupiter trojan Greek · background |
| Adjectives | Demophontian |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 32.65 yr (11,927 d) |
| Aphelion | 5.8832 AU |
| Perihelion | 4.6425 AU |
Semi-major axis | 5.2628 AU |
| Eccentricity | 0.1179 |
Orbital period (sidereal) | 12.07 yr (4,410 d) |
Mean anomaly | 197.56° |
Mean motion | 0° 4m 53.76s / day |
| Inclination | 2.8706° |
Longitude of ascending node | 24.383° |
| 58.875° | |
| Jupiter MOID | 0.0724 AU |
| TJupiter | 2.9840 |
| Physical characteristics | |
Mean diameter | 45.68±6.58 km 53.16 km (calculated) |
Synodic rotation period | 29.82±0.24 h |
| 0.057 (assumed) 0.077±0.015 | |
| C (assumed) V–I = 1.060±0.037 | |
| 10.1 | |
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