130 Elektra
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.
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° |
| 237.588° | |
| Known satellites | 3 |
| Physical characteristics | |
| Dimensions | c/a = 0.57±0.04 262 × 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 |
| 156° | |
Pole ecliptic latitude | –88° |
Pole ecliptic longitude | 71° |
| 0.067 (calculated) 0.086±0.015 (NEOWISE) 0.0755±0.0110 (IRAS) | |
| G (Tholen) Ch (SMASS) | |
| 7.21 · 7.05 | |
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