130 Elektra
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A three-dimensional model of 130 Elektra based on its light curve.
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| Discovery | |||||||||||||
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| Discovered by | Christian Heinrich Friedrich Peters | ||||||||||||
| Discovery date | 17 February 1873 | ||||||||||||
| Designations | |||||||||||||
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Named after
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Electra | ||||||||||||
| Main belt | |||||||||||||
| Orbital characteristics | |||||||||||||
| Epoch 31 July 2016 (JD 2457600.5) | |||||||||||||
| Uncertainty parameter 0 | |||||||||||||
| Observation arc | 122.35 yr (44690 d) | ||||||||||||
| Aphelion | 3.77969 AU (565.434 Gm) | ||||||||||||
| Perihelion | 2.47815 AU (370.726 Gm) | ||||||||||||
| 3.12892 AU (468.080 Gm) | |||||||||||||
| Eccentricity | 0.20799 | ||||||||||||
| 5.53 yr (2021.6 d) | |||||||||||||
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Average orbital speed
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16.66 km/s | ||||||||||||
| 128.885° | |||||||||||||
| 0° 10m 41.084s / day | |||||||||||||
| Inclination | 22.8461° | ||||||||||||
| 145.401° | |||||||||||||
| 236.231° | |||||||||||||
| Known satellites | S/2003 (130) 1 S/2014 (130) 1 |
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| Earth MOID | 1.54388 AU (230.961 Gm) | ||||||||||||
| Jupiter MOID | 1.88708 AU (282.303 Gm) | ||||||||||||
| Jupiter Tisserand parameter | 3.061 | ||||||||||||
| Physical characteristics | |||||||||||||
| Dimensions |
182.25±11.8 km 215×155 ± 12 km |
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| Mass | 6.6±0.4×1018 kg 1.28±0.10×1019 kg |
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Mean density
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1.3 ± 0.3 g/cm3 3.8 ± 0.3 g/cm3 |
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Equatorial surface gravity
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0.07 m/s2 | ||||||||||||
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Equatorial escape velocity
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0.13 km/s | ||||||||||||
| 5.225 h (0.2177 d) | |||||||||||||
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Sidereal rotation period
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0.230103 d (5.52247 h) | ||||||||||||
| 157° | |||||||||||||
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Pole ecliptic latitude
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-88° | ||||||||||||
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Pole ecliptic longitude
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68° | ||||||||||||
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0.0755±0.011 0.076 ± 0.011 |
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| G | |||||||||||||
| 7.12 | |||||||||||||
| Discovery | |
|---|---|
| Discovered by |
W. J. Merline, P. M. Tamblyn, C. Dumas, L. M. Close, C. R. Chapman, and F. Menard |
| Discovery date | 15 August 2003 |
| Designations | |
| Main belt | |
| Orbital characteristics | |
| 1318 ± 25 km | |
| Eccentricity | 0.13 ± 0.03 |
| 5.258 ± 0.0053 d | |
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Average orbital speed
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23 m/s |
| Inclination | 3 |
| Satellite of | 130 Elektra |
| Physical characteristics | |
| Dimensions | 7 ± 3 km |
| Mass | ~4×1014 kg |
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Equatorial escape velocity
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~ 4 m/s |
| 14.5 | |
| Discovery | |
|---|---|
| Discovered by |
B. Yang, Z. Wahhaj, M. Marsset, J. Milli, C. Dumas, and F. Marchis |
| Discovery date | December 6, 2014 |
| Designations | |
| Main belt | |
| Orbital characteristics | |
| 460 | |
| Eccentricity | ? |
| 1.1 d | |
| Inclination | ? |
| Satellite of | 130 Elektra |
| Physical characteristics | |
| Dimensions | 5.2 ± 1.2 km |
130 Elektra is a very large outer main-belt asteroid. It was discovered by C. H. F. Peters on February 17, 1873, and named after Electra, an avenger in Greek mythology.
Its spectrum is of the G type, hence it probably has a Ceres-like composition. Spectral signatures of organic compounds have been seen on Elektra's surface.
In the late 1990s, a network of astronomers worldwide gathered lightcurve data that was ultimately used to derive the spin states and shape models of 10 new asteroids, including (130) Elektra. The light curve of (130) Elektra forms a double sinusoid while the shape model is elongated and the derived rotation axis is perpendicular to the plane of the ecliptic.
Optical observations have found two satellites of this asteroid. Once the orbits are known, Elektra's mass can be reliably found. The value of 6.6×1018 kg indicates a density of 1.3 ± 0.3 g/cm3. Optical observations have also determined that Elektra's shape is quite irregular, as well as giving indications of albedo differences of 5-15% on its surface.
In 2003, a small moon of (130) Elektra was detected using the Keck II telescope. The diameter of the satellite is 4 km and it orbits at a distance of about 1170 km. The satellite has been given the provisional designation S/2003 (130) 1. Due to only a few observations to date, its orbit is still relatively loosely constrained. In December 2014 a slightly smaller moon, orbiting Elektra about three times closer than S/2003 (130) 1, was discovered using the SPHERE instrument on the VLT's Melipal (UT3) telescope. This second satellite has been provisionally named S/2014 (130) 1.
Elektra's 2nd moon is about 2 kilometres across and has been provisionally named S/2014 (130) 1.
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