1437 Diomedes
1437 Diomedes /ˌdaɪəˈmiːdiːz/ is a large Jupiter trojan from the Greek camp, approximately 150 kilometers (90 miles) in diameter. It was discovered on 3 August 1937, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The dark D/P-type asteroid belongs to the largest Jupiter trojans and has a notably elongated shape and a longer than average rotation period of 24.49 hours. Diomedes was the first Jupiter trojan successfully observed during an occultation event of star. It was named after the hero Diomedes from Greek mythology.
Modelled shape of Diomedes from its light curve | |
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 3 August 1937 |
| Designations | |
MPC designation | (1437) Diomedes |
| Pronunciation | /ˌdaɪəˈmiːdiːz/ |
Named after | Diomedes (Greek mythology) |
Alternative designations | 1937 PB · 1931 DN 1936 PQ · 1971 RD |
Minor planet category | Jupiter trojan Greek · background |
| Adjectives | Diomedian |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 80.80 yr (29,514 d) |
| Aphelion | 5.4248 AU |
| Perihelion | 4.9720 AU |
Semi-major axis | 5.1984 AU |
| Eccentricity | 0.0435 |
Orbital period (sidereal) | 11.85 yr (4,329 d) |
Mean anomaly | 234.43° |
Mean motion | 0° 4m 59.52s / day |
| Inclination | 20.485° |
Longitude of ascending node | 315.80° |
| 130.93° | |
| Jupiter MOID | 0.275 AU |
| TJupiter | 2.8720 |
| Physical characteristics | |
| Dimensions | 284 km × 126 km × 65 km |
Mean diameter | 117.79±1.18 km 132.5 km 164.31±4.1 km 172.60±3.42 km 173.0 km |
Synodic rotation period | 16 h 18 h 21 h 24.46 h 24.49±0.01 h |
| 0.028±0.001 0.0313±0.002 0.061±0.011 | |
| Tholen = DP U–B = 0.250±040 B–V = 0.700±014 V–I = 0.810±0.025 | |
| 8.18±0.28 8.30 | |
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