588 Achilles

588 Achilles
Discovery A
Discoverer Max Wolf
Discovery date February 22, 1906
1906 TG B
Category Trojan asteroid
Orbital elements C D
Epoch October 22, 2004 (JD 2453300.5)
Eccentricity (e) 0.147
Semi-major axis (a) 776.669 Gm (5.192 AU)
Perihelion (q) 662.395 Gm (4.428 AU)
Aphelion (Q) 890.944 Gm (5.956 AU)
Orbital period (P) 4320.803 d (11.83 a)
Mean orbital speed 13.00 km/s
Inclination (i) 10.324°
Longitude of the
ascending node (Ω))
Argument of
perihelion (ω)
Mean anomaly (M) 157.779°
Physical characteristics
Dimensions 135.5 km
Mass 2.6—1018 kg
Density 2.0 g/cm³
Surface gravity 0.0379 m/s²
Escape velocity 0.0716 km/s
Rotation period >0.5 d 1
Spectral class D
Absolute magnitude 8.67
Albedo 0.0328 2
Mean surface
~124 K

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, a fictional hero from the Trojan War. 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).

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