Discovered by J. C. Watson Observation arc 136.01 yr (49676 d) Perihelion 3.1417 AU (469.99 Gm) Discovered 28 September 1876 Spectral type C-type asteroid Discovery site Detroit Observatory | Discovery date 28 September 1876 Aphelion 3.6215 AU (541.77 Gm) Semi-major axis 3.3816 AU (505.88 Gm) Orbits Sun Discoverer James Craig Watson Asteroid group Cybele asteroid | |
Similar 167 Urda, 161 Athor, 132 Aethra, 128 Nemesis, 174 Phaedra | ||
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.
References
168 Sibylla Wikipedia(Text) CC BY-SA