86 Semele
| Discovery | |
|---|---|
| Discovered by | Friedrich Tietjen |
| Discovery date | January 4, 1866 |
| Designations | |
Named after | Semele |
| Main belt | |
| Orbital characteristics[1] | |
| 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 [2] |
| 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.[3] 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.[4]
References
- ↑ Yeomans, Donald K., "86 Semele", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-04-07.
- ↑ Asteroid Data Sets
- ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ↑ Šidlichovský, M. (1999), Svoren, J.; Pittich, E. M.; Rickman, H., eds., "Resonances and chaos in the asteroid belt", Evolution and source regions of asteroids and comets : proceedings of the 173rd colloquium of the International Astronomical Union, held in Tatranska Lomnica, Slovak Republic, August 24–28, 1998, pp. 297–308, Bibcode:1999esra.conf..297S.
External links
- 86 Semele at the JPL Small-Body Database
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