4489 Dracius
4489 Dracius, (prov. designation: 1988 AK), is a large Jupiter trojan from the Greek camp, approximately 90 kilometers (56 miles) in diameter. It was discovered on 15 January 1988, by American astronomer Edward Bowell at the Anderson Mesa Station of the Lowell Observatory near Flagstaff, Arizona, in the United States. The dark D-type asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 12.58 hours. It was named after Dracius from Greek mythology, who was a commander of the Epeans who fought against Hector.
Shape model of Dracius from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Lowell Obs. |
| Discovery date | 15 January 1988 |
| Designations | |
MPC designation | (4489) Dracius |
Named after | Dracius (Greek mythology) |
Alternative designations | 1988 AK · 1980 KA1 1989 AQ1 |
Minor planet category | Jupiter trojan Greek · background |
| Adjectives | Dracian |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 37.94 yr (13,857 d) |
| Aphelion | 5.5196 AU |
| Perihelion | 4.9173 AU |
Semi-major axis | 5.2184 AU |
| Eccentricity | 0.0577 |
Orbital period (sidereal) | 11.92 yr (4,354 d) |
Mean anomaly | 174.79° |
Mean motion | 0° 4m 57.72s / day |
| Inclination | 22.224° |
Longitude of ascending node | 86.540° |
| 6.5830° | |
| Jupiter MOID | 0.1975 AU |
| TJupiter | 2.8480 |
| Physical characteristics | |
Mean diameter | 76.60±0.41 km 92.93±7.4 km 95.02±2.47 km |
Synodic rotation period | 12.580±0.001 h 12.58±0.1 h 12.582±0.001 h 12.582±0.004 h |
| 0.050±0.003 0.0514±0.009 0.069±0.005 | |
| D (SDSS-MOC) D (S3OS2) D (Pan-STARRS) V–I = 0.950±0.037 | |
| 9.00 9.1 9.12±0.22 | |
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