168 Sibylla
| 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 kg[4] |
Mean density | 2.26 ± 1.05[4] g/cm3 |
| 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
- ^ "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". Retrieved August 14, 2012.
- ^ Yeomans, Donald K., "168 Sibylla", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 2013-03-25.
- ^ "The Asteroid Orbital Elements Database". Retrieved August 14, 2012.
- ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ^ a b di Martino, M.; et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus, vol. 107, no. 2, pp. 269–275, Bibcode:1994Icar..107..269D, doi:10.1006/icar.1994.1022.
External links
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