86 Semele
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| Discovery | |
|---|---|
| Discovered by: | Friedrich Tietjen |
| Discovery date: | January 4, 1866 |
| Alternative names: | |
| Minor planet category: | Main belt |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion distance: | 562.652 Gm (3.761 AU) |
| Perihelion distance: | 369.116 Gm (2.467 AU) |
| Semi-major axis: | 465.884 Gm (3.114 AU) |
| Eccentricity: | 0.208 |
| Orbital period: | 2007.366 d (5.50 a) |
| Avg. orbital speed: | 16.69 km/s |
| Mean anomaly: | 264.875° |
| Inclination: | 4.822° |
| Longitude of ascending node: | 86.452° |
| Argument of perihelion: | 307.886° |
| Physical characteristics | |
| Dimensions: | 120.6 km |
| Mass: | 1.8×1018 kg |
| Mean density: | ? g/cm³ |
| Equatorial surface gravity: | 0.0337 m/s² |
| Escape velocity: | 0.0638 km/s |
| Rotation period: | ? d |
| Albedo: | 0.047 [1] |
| Temperature: | ~158 K |
| Spectral type: | C |
| Absolute magnitude: | 8.54 |
86 Semele (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.
[edit] References
| Minor planets | ||
|---|---|---|
| Previous minor planet | 86 Semele | Next minor planet |
| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System.
For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.
