617 Patroclus

617 Patroclus
Discovery A
Discoverer August Kopff
Discovery date October 17, 1906
1906 VY; 1941 XC;
1962 NB B
Category Jupiter Trojan
Orbital elements C D
Epoch ???
Eccentricity (e) 0.138
Semi-major axis (a) 5.228 AU
Perihelion (q) 4.506 AU
Aphelion (Q) 5.950 AU
Orbital period (P) 4365.7 d (11.95 a)
Mean orbital speed  ???
Inclination (i) 22.03°
Longitude of the
ascending node (Ω)
Argument of
perihelion (ω)
Mean anomaly (M) 149.94°
Physical characteristics
Dimensions 105 km
Mass ~8.7—1017 kg
Density 1.3 ? g/cm³
Surface gravity  ???
Escape velocity  ???
Rotation period >40 h
Spectral class  ???
Absolute magnitude 8.19
Albedo 0.047
Mean surface

617 Patroclus is the second Jovian Trojan asteroid to be discovered. It was discovered in 1907 by August Kopff.

Patroclus lies in Jupiter's trailing Lagrangian point, L5, called the 'Trojan' node after one of the two sides in the legendary Trojan War. It is the only asteroid in the Trojan camp to be named after a Greek character because the naming conventions for the Trojan asteroids were not adopted until after Patroclus was named. Similarly the asteroid Hektor is the only Trojan character in the Greek camp.

In 2001 it was discovered that Patroclus is actually a binary asteroid. The larger component retains the name Patroclus while the smaller is known as S/2001 (617) 1.

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The minor planets

Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans

Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt | Scattered disc | Oort cloud)

For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system

For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.

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