130 Elektra information

130 Elektra
	VLT-SPHERE adaptive optics image of Elektra taken on 5 August 2019
Discovery
Discovered by	C. H. F. Peters
Discovery site	Litchfield Obs.
Discovery date	17 February 1873
Designations
MPC designation	(130) Elektra
Pronunciation	/ɪˈlɛktrə/
Named after	Electra
Alternative designations	A873 DA
Minor planet category	main-belt · (outer); background
Adjectives	Elektrian /ɪˈlɛktriən/
Orbital characteristics
	Epoch 1 July 2021 (JD 2459396.5)
	Uncertainty parameter 0
Observation arc	127.53 yr (46,582 d)
Aphelion	3.7808 AU
Perihelion	2.4725 AU
Semi-major axis	3.1266 AU
Eccentricity	0.20923
Orbital period (sidereal)	5.53 yr (2,019 d)
Mean anomaly	87.758°
Mean motion	0° 10m 41.79s / day
Inclination	22.782°
Longitude of ascending node	145.009°
Argument of perihelion	237.588°
Known satellites	3
Physical characteristics
Dimensions	c/a = 0.57±0.04[clarification needed]; 262 × 205 × 164±3% km
Mean diameter	199±2 km
Mass	(6.4±0.2)×1018 kg; (7.0±0.3)×1018 kg
Mean density	1.55±0.07 g/cm3
Synodic rotation period	5.224663±0.000001 h
Axial tilt	156°
Pole ecliptic latitude	–88°
Pole ecliptic longitude	71°
Geometric albedo	0.067 (calculated); 0.086±0.015 (NEOWISE); 0.0755±0.0110 (IRAS)
Spectral type	G (Tholen); Ch (SMASS)
Absolute magnitude (H)	7.21 · 7.05

Elektra (minor planet designation: 130 Elektra) is a large outer main-belt asteroid and quadruple system with three minor-planet moons. It was discovered on 17 February 1873, by astronomer Christian Peters at Litchfield Observatory, New York, and named after Electra, an avenger in Greek mythology.

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[8] George William Cox (1878) History of Greece

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