65 Cybele
3D shape model of Cybele from ground-based observations.
|
|
| Discovery | |
|---|---|
| Discovered by | Ernst Wilhelm Tempel |
| Discovery date | March 8, 1861 |
| Designations | |
| Pronunciation | /ˈsɪbᵻliː/ SIB-əl-ee |
|
Named after
|
Cybele |
| outer main belt (Cybele) | |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 567.544 Gm (3.794 AU) |
| Perihelion | 459.654 Gm (3.073 AU) |
| 513.599 Gm (3.433 AU) | |
| Eccentricity | 0.105 |
| 2323.521 d (6.36 a) | |
|
Average orbital speed
|
16.03 km/s |
| 279.683° | |
| Inclination | 3.548° |
| 155.808° | |
| 105.757° | |
| Physical characteristics | |
| Dimensions | 302×290×232 km 273.0±11.9 km 237.3 km IRAS |
| Mass | 1.78×1019 kg |
|
Mean density
|
0.99±0.20 g/cm³ |
| 0.0663 m/s² | |
| 0.1255 km/s | |
| 4.041 h | |
| Albedo | 0.050 ± 0.005 0.071 |
| Temperature | ~150 K |
|
Spectral type
|
Xc/P |
| 10.67 to 13.64 | |
| 6.62 | |
65 Cybele is one of the largest asteroids in the Solar System and is located in the outer asteroid belt. It gives its name to the Cybele family of asteroids that orbit outward from the Sun from the 2:1 orbital resonance with Jupiter. Cybele is a X-type asteroid, meaning that it is dark in color and carbonaceous in composition. It was discovered in 1861 by Ernst Tempel and named after Cybele, the earth goddess.
Cybele was discovered on March 8, 1861, by Ernst Tempel from the Marseilles Observatory. A minor controversy arose from its naming process. Tempel had awarded the honour of naming the asteroid to Carl August von Steinheil in recognition of his achievements in telescope production. Von Steinheil elected to name it "Maximiliana" after the reigning monarch Maximilian II of Bavaria. At the time, asteroids were conventionally given classical names, and a number of astronomers protested this contemporary appellation. The name Cybele was chosen instead, referring to the Phrygian goddess of the earth.
The first Cybelian stellar occultation was observed on October 17, 1979 in the Soviet Union. The asteroid appeared to have an irregular shape, with the longest chord being measured as 245 km, closely matching the diameter of 237 km determined by the IRAS satellite in 1983. During the same 1979 occultation, a hint of a possible 11 km wide satellite was detected.
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