588 Achilles

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588 Achilles
Discovered by Max Wolf
Discovery date February 22, 1906
Other names 1906 TG
Category Trojan asteroid
Reference date October 22, 2004 (JD 2453300.5)
Longest distance from the Sun 890.944 Gm (5.956 AU)
Shortest distance from the Sun 662.395 Gm (4.428 AU)
Longest distance from the center of its orbital path
("semi-major axis")
776.669 Gm (5.192 AU)
How long it takes to complete an orbit 4320.803 d (11.83 a)
Average speed 13.00 km/s
Mean anomaly 157.779°
Angle above the reference plane
Size and other qualities
Measurements 135.5 km
Mass 2.6×1018 kg
Average density 2.0 g/cm³
Surface gravity 0.0379 m/s²
Escape velocity 0.0716 km/s
Rotation period >0.5 d 1
How much light it reflects 0.0328 2
Avg. surface temp. ~124 K
Spectral type D
True brightness
("absolute magnitude")

588 Achilles is an asteroid found on February 22, 1906 by the German astronomer Max Wolf. It was the first of the Trojan asteroids to be found, 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 found, the rule was made 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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