624 Hektor

624 Hektor
	624 Hektor and its moon Skamandrios
Discovery
Discovered by	A. Kopff
Discovery site	Heidelberg Obs.
Discovery date	10 February 1907
Designations
MPC designation	(624) Hektor
Pronunciation	/ˈhɛktər/
Named after	Hector (Greek mythology)
Alternative designations	1907 XM; 1948 VD
Minor planet category	Jupiter trojan · Hektor ; Greeks
Adjectives	Hektorean or Hektorian ; (both /hɛkˈtɔːriən/)
Orbital characteristics
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 0
Observation arc	111.28 yr (40,646 d)
Aphelion	5.3824 AU
Perihelion	5.1319 AU
Semi-major axis	5.2571 AU
Eccentricity	0.0238
Orbital period (sidereal)	12.05 yr (4,403 d)
Mean anomaly	136.09°
Mean motion	0° 4m 54.48s / day
Inclination	18.166°
Longitude of ascending node	342.79°
Argument of perihelion	185.22°
Known satellites	1
Jupiter MOID	0.2752 AU
TJupiter	2.8990
Physical characteristics
Dimensions	403 km × 201 km (derived); 370 km × 195 km × 195 km
Mean diameter	250±26 km; (if bilobe: 256±12 km); 225 km; 147±2 km; 227±15 km; 231±4 km
Mass	(7.9±1.4)×1018 kg; (9.95±0.12)×1018 kg
Mean density	1.0±0.3 g/cm3; 1.63±0.32 g/cm3; 2.43±0.35 g/cm3
Synodic rotation period	6.9205 hours (0.28835 d)
Geometric albedo	0.025; 0.034±0.001; 0.107±0.011
Spectral type	D (Tholen)
Apparent magnitude	13.79 to 15.26 [citation needed]
Absolute magnitude (H)	7.20 · 7.3 · 7.49
Angular diameter	0.078" to 0.048" [citation needed]

624 Hektor /ˈhɛktər/ is the largest Jupiter trojan and the namesake of the Hektor family, with a highly elongated shape equivalent in volume to a sphere of approximately 225 to 250 kilometers diameter. It was discovered on 10 February 1907, by astronomer August Kopff at Heidelberg Observatory in southwest Germany, and named after the Trojan prince Hector, from Greek mythology.^[1]^[3] It has one small 12-kilometer sized satellite, Skamandrios, discovered in 2006.^[7]

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[OED-2] "Hector". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

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