588 Achilles

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588 Achilles
Discovered by Max Wolf
Discovery time February 22, 1906
Other names 1906 TG
Group 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 egg-shaped its orbit is
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
Longitude of where it comes up through the reference plane 316.583°
Angle between its shortest distance from what it orbits around and where it comes up through the reference plane
("argument of periapsis")
Size and Other Qualities
Measures 135.5 km
Mass 2.6×1018 kg
Average density 2.0 g/cm³
Gravity at its surface 0.0379 m/s²
Slowest speed able to escape into space
("escape velocity")
0.0716 km/s
How long it takes to turn around one time >0.5 d 1
How much light it reflects 0.0328 2
Avg. surface temp. ~124 K
Light-band group
("spectral type")
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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