588 Achilles
From Wikipedia, the free encyclopedia
|
Discovery
|
|
|---|---|
| Discovered by | Max Wolf |
| Discovery date | February 22, 1906 |
|
Designations
|
|
| Named after | Achilles |
| Alternate name(s) | 1906 TG |
| Minor planet category |
Trojan asteroid |
| Adjective | Achillean |
| Epoch October 22, 2004 (JD 2453300.5) | |
| Aphelion | 890.944 Gm (5.956 AU) |
| Perihelion | 662.395 Gm (4.428 AU) |
| Semi-major axis | 776.669 Gm (5.192 AU) |
| Eccentricity | 0.147 |
| Orbital period | 4320.803 d (11.83 a) |
| Average orbital speed | 13.00 km/s |
| Mean anomaly | 157.779° |
| Inclination | 10.324° |
| Longitude of ascending node | 316.583° |
| Argument of perihelion | 132.770° |
|
Physical characteristics
|
|
| Dimensions | 135.5 km |
| Mass | 2.6×1018 kg |
| Mean density | 2.0 g/cm³ |
| Equatorial surface gravity | 0.0379 m/s² |
| Escape velocity | 0.0716 km/s |
| Rotation period | >0.5 d 1 |
| Albedo | 0.0328 2 |
| Temperature | ~124 K |
| Spectral type | D |
| Absolute magnitude (H) | 8.67 |
588 Achilles is an asteroid discovered on February 22, 1906, by the German astronomer Max Wolf. It was the first of the trojan asteroids to be discovered, and is named after Achilles, the fictional hero from the Iliad. It orbits in the L4 Lagrangian point of the Sun-Jupiter system. After a few such asteroids were discovered, the rule was established that the L4 point was the "Greek camp", while 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).
[edit] External links
- Orbital simulation from JPL (Java)
- Ephemeris
|
|||||
|
||||||||||||||||||||||
