168 Sibylla
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| 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 |
| Semi-major axis | 3.377 AU |
| Eccentricity | 0.066 |
| Orbital period | 6.21 years |
| Average orbital speed | 16.19 km/s |
| Mean anomaly | 261.860° |
| Inclination | 4.63° |
| Longitude of ascending node | 206.469° |
| Argument of perihelion | 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 |
| Absolute magnitude (H) | 7.94 |
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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.
- ↑ 4.0 4.1 4.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ 5.0 5.1 di Martino, M. et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus 107 (2): 269–275, Bibcode:1994Icar..107..269D, doi:10.1006/icar.1994.1022.
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