65 Cybele
Cybele, minor planet designation 65 Cybele, is one of the largest asteroids in the Solar System. It is located in the outer asteroid belt. It is thought to be a remnant primordial body. It gives its name to the Cybele group of asteroids that orbit outward from the Sun from the 2:1 orbital resonance with Jupiter. The X-type asteroid has a relatively short rotation period of 6.0814 hours. It was discovered by Wilhelm Tempel in 1861, and named after Cybele, the earth goddess.
| Discovery | |
|---|---|
| Discovered by | E. W. Tempel |
| Discovery site | Marseille Obs. |
| Discovery date | 8 March 1861 |
| Designations | |
MPC designation | (65) Cybele |
| Pronunciation | /ˈsɪbəliː/ |
Named after | Cybele (Hellenistic deity) |
Alternative designations | 1949 YQ |
Minor planet category | main belt · (outer) Cybele |
| Adjectives | Cybelean /ˌsɪbəˈliːən/, rarely Cybelian /sɪˈbɛliən/ |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 155.98 yr (56,971 d) |
| Aphelion | 3.8102 AU |
| Perihelion | 3.0464 AU |
Semi-major axis | 3.4283 AU |
| Eccentricity | 0.1114 |
Orbital period (sidereal) | 6.35 yr (2,319 days) |
Mean anomaly | 168.06° |
Mean motion | 0° 9m 19.08s / day |
| Inclination | 3.5627° |
Longitude of ascending node | 155.63° |
| 102.37° | |
| Physical characteristics | |
| Dimensions | 297 km × 291 km × 213 km |
Mean diameter | 263±3 km |
| Mass | est. (14.8±1.8)×1018 kg |
Mean density | 1.55±0.19 g/cm3 |
Synodic rotation period | 3.98704 h 4.036 h 4.04 h 4.04052 h 6.07 h 6.07 h 6.08±0.05 h 6.081±0.001 h 6.0814±0.0001 h 6.081434±0.000005 h 6.082±0.001 h |
| 0.044 0.050±0.005 0.06±0.03 0.06±0.04 0.0706±0.003 | |
| Tholen = P SMASS = Xc · X B–V = 0.690 U–B = 0.271 V–R = 0.400±0.007 | |
| 10.67 to 13.64 | |
| 6.58±0.06 · 6.62 · 6.88±0.26 · 6.95 | |
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