588 Achilles
| Discovery | |
|---|---|
| Discovered by | M. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 22 February 1906 |
| Designations | |
| MPC designation | 588 Achilles |
| Pronunciation | əˈkɪliːz |
|
Named after
|
Achilles (Greek mythology) |
| 1906 TG | |
|
Jupiter trojan (Greek camp) |
|
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 110.15 yr (40234 d) |
| Aphelion | 5.9713 AU (893.29 Gm) |
| Perihelion | 4.4432 AU (664.69 Gm) |
| 5.2072 AU (778.99 Gm) | |
| Eccentricity | 0.14673 |
| 11.88 yr (4340.18 d) | |
| 155.19° | |
| 0° 4m 58.606s / day | |
| Inclination | 10.316° |
| 316.55° | |
| 133.60° | |
| Earth MOID | 3.46853 AU (518.885 Gm) |
| Jupiter MOID | 0.568234 AU (85.0066 Gm) |
| Jupiter Tisserand parameter | 2.946 |
| Physical characteristics | |
| Dimensions |
135.47±4.1 km (IRAS:15) 133.22±3.33 km 130.10±0.55 km |
|
Mean radius
|
67.735±2.05 km |
|
7.306±0.002 h 12 h 7.0 h 7.312±0.003 h 7.32±0.02 h 7.306 h (0.3044 d) |
|
|
0.0328±0.002 (IRAS:15) 0.035±0.002 0.043±0.006 |
|
|
B–V = 0.755 U–B = 0.216 Tholen = DU D (LCDB) |
|
| 8.67 | |
588 Achilles (ə-kil'-eez), provisional designation 1906 TG, is a large and dark asteroid, classified as Jupiter trojan, the first and 6th-largest of its kind ever confirmed by astronomers (A904 RD was discovered 2 years previous, but was not observed long enough to calculate an orbit). It was discovered on 22 February 1906, by the German astronomer Max Wolf at Heidelberg Observatory in southern Germany. It measures about 135 kilometers in diameter and was named after Achilles from Greek mythology.
The D-type asteroid, classified as a DU-subtype in the Tholen taxonomic scheme, orbits the Sun at a distance of 4.4–6.0 AU in the L4 Lagrangian point of the Sun–Jupiter System once every 11 years and 10 months (4,337 days). Its orbit shows an eccentricity of 0.15 and an inclination of 10 degrees from the plane of the ecliptic. The asteroid is the first known example of the stable solution of the three-body problem worked out by French mathematician Joseph Lagrange in 1772, after whom the minor planet 1006 Lagrangea is named. After the discovery of other asteroids with similar orbital characteristics, which were also named after heroes from the Trojan War (see below), the term "Trojan asteroids" or "Jupiter trojans" became commonly used. In addition, a rule was established that the L4 point was the "Greek camp", whereas the L5 point was the "Trojan camp", though not before each camp had acquired a "spy" (624 Hektor in the Greek camp and 617 Patroclus in the Trojan camp).
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