86 Semele
| Discovery | |
|---|---|
| Discovered by | Friedrich Tietjen |
| Discovery date | January 4, 1866 |
| Designations | |
|
Named after
|
Semele |
| Main belt | |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 562.652 Gm (3.761 AU) |
| Perihelion | 369.116 Gm (2.467 AU) |
| 465.884 Gm (3.114 AU) | |
| Eccentricity | 0.208 |
| 2,007.366 d (5.50 a) | |
|
Average orbital speed
|
16.69 km/s |
| 264.875° | |
| Inclination | 4.822° |
| 86.452° | |
| 307.886° | |
| Physical characteristics | |
| Dimensions | 120.6 km |
| Mass | 1.8×1018 kg |
| 0.0337 m/s² | |
| 0.0638 km/s | |
| Albedo | 0.047 |
| Temperature | ~158 K |
|
Spectral type
|
C |
| 8.54 | |
86 Semele (/ˈsɛmᵻliː/ SEM-i-lee) is a large and very dark main-belt asteroid. It is probably composed of carbonates. Semele was discovered by German astronomer Friedrich Tietjen on January 4, 1866. It was his first and only asteroid discovery. It is named after Semele, the mother of Dionysus in Greek mythology.
The orbit of 86 Semele places it in a 13:6 mean motion resonance with the planet Jupiter. The computed Lyapunov time for this asteroid is only 6,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets. This Lyapunov time is the second lowest among the first 100 named minor planets.
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