86 Semele
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Discovery
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Discovered by | Friedrich Tietjen |
Discovery date | January 4, 1866 |
Designations
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Alternative names | |
Minor planet category |
Main belt |
Epoch December 31, 2006 (JD 2454100.5) | |
Aphelion | 562.652 Gm (3.761 AU) |
Perihelion | 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) |
Average 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
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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, IPA: /ˈsɛmɨli/) 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
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