168 Sibylla
From Infogalactic: the planetary knowledge core
| Discovery[1] | |
|---|---|
| Discovered by | J. C. Watson |
| Discovery site | Ann Arbor |
| Discovery date | September 28, 1876 |
| Orbital characteristics[2][3] | |
| Aphelion | 3.601 AU |
| Perihelion | 3.154 AU |
| 3.377 AU | |
| Eccentricity | 0.066 |
| 6.21 years | |
|
Average orbital speed
|
16.19 km/s |
| 261.860° | |
| Inclination | 4.63° |
| 206.469° | |
| 168.166 | |
| Physical characteristics | |
| Dimensions | 149.06 ± 4.29[4] km |
| Mass | (3.92 ± 1.80) × 1018[4] kg |
|
Mean density
|
2.26 ± 1.05[4] g/cm3 |
|
Sidereal rotation period
|
23.82[5] hours |
| Albedo | 0.054 |
|
Spectral type
|
C |
| 7.94 | |
168 Sibylla is a large main-belt asteroid, discovered by Canadian-American astronomer J. C. Watson on September 28, 1876. Based upon its spectrum this object is classified as a C-type asteroid, which indicates it is very dark and composed of primitive carbonaceous materials. 168 Sibylla is a Cybele asteroid, orbiting beyond most of the main-belt asteroids.
Photometric observations of this asteroid made at the Torino Observatory in Italy during 1990–1991 were used to determine a synodic rotation period of 23.82 ± 0.004 hours.[5]
References
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