65 Cybele
From Wikipedia, the free encyclopedia
|
Discovery
|
|
|---|---|
| Discovered by | Ernst Wilhelm Tempel |
| Discovery date | March 8, 1861 |
|
Designations
|
|
| Alternative names | |
| Minor planet category |
Main belt (Cybele) |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 567.544 Gm (3.794 AU) |
| Perihelion | 459.654 Gm (3.073 AU) |
| Semi-major axis | 513.599 Gm (3.433 AU) |
| Eccentricity | 0.105 |
| Orbital period | 2323.521 d (6.36 a) |
| Average orbital speed | 16.03 km/s |
| Mean anomaly | 279.683° |
| Inclination | 3.548° |
| Longitude of ascending node | 155.808° |
| Argument of perihelion | 105.757° |
|
Physical characteristics
|
|
| Dimensions | 237.3 km |
| Mass | 1.4×1019 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0663 m/s² |
| Escape velocity | 0.1255 km/s |
| Rotation period | ? d |
| Albedo | 0.071 [1] |
| Temperature | ~150 K |
| Spectral type | C |
| Absolute magnitude | 6.62 |
65 Cybele (pronounced /ˈsɪbɨli/ sib'-ə-lee) is one of the largest asteroids in the main belt. It gives its name to the Cybele asteroids which orbit outward from the Sun from the 2:1 orbital resonance with Jupiter. As a C-type asteroid it is dark in color and carbonaceous in composition. It was discovered on March 8, 1861 by Ernst Tempel and named after Cybele the earth goddess.
First Cybelian stellar occultation was observed on October 17, 1979 in the Soviet Union. A diameter of 230 km was derived, closely matching the diameter of 237 km determined by the IRAS satellite. During the same occultation, a hint of a possible 11 km wide satellite was detected. [1]
[edit] References
|
|||||
