168 Sibylla
 Orbital diagram | |
| Discovery[1] | |
|---|---|
| Discovered by | J. C. Watson |
| Discovery site | Ann Arbor |
| Discovery date | 28 September 1876 |
| Designations | |
| (168) Sibylla | |
| Pronunciation | /sɪˈbɪlə/[2] |
Named after | Sibyls |
| A876 SA; 1911 HF; 1949 MO | |
| main-belt | |
| Adjectives | Sibyllian /sɪˈbɪliən/ |
| Orbital characteristics[3][4] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 136.01 yr (49676 d) |
| Aphelion | 3.6215 AU (541.77 Gm) |
| Perihelion | 3.1417 AU (469.99 Gm) |
| 3.3816 AU (505.88 Gm) | |
| Eccentricity | 0.070943 |
| 6.22 yr (2271.4 d) | |
Average orbital speed | 16.19 km/s |
| 171.517° | |
| 0° 9m 30.564s / day | |
| Inclination | 4.6617° |
| 205.959° | |
| 173.920° | |
| Physical characteristics | |
| Dimensions | 148.39±4.0 km[3] 149.06 ± 4.29 km[5] |
| Mass | (3.92 ± 1.80) × 1018 kg[5] |
Mean density | 2.26 ± 1.05 g/cm3[5] |
| 47.009 h (1.9587 d) | |
| 23.82 hours[6] | |
| 0.0535±0.003 | |
| C | |
| 7.94 | |
168 Sibylla is a large main-belt asteroid, discovered by Canadian-American astronomer J. C. Watson on September 28, 1876. It was most likely named for the Sibyls, referring to the Ancient Greek female oracles.[7] 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.[6] The shape of this slowly rotating object appears to resemble an oblate spheroid.[8]
References[edit]
- ^ "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". Retrieved 14 August 2012.
- ^ "Sibylla". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b Yeomans, Donald K., "168 Sibylla", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- ^ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory. Retrieved 14 August 2012.
- ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009, S2CID 119226456. See Table 1.
- ^ a b 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.
- ^ Schmadel, Lutz (2003), Dictionary of Minor Planet Names, Physics and astronomy online library, vol. 1, Springer Science & Business Media, p. 30, ISBN 9783540002383.
- ^ Wang, Xiaobin; et al. (January 2016), "Studies for slowly rotating asteroids (168) Sibylla and (346) Hermentaria", Asteroids: New Observations, New Models, Proceedings of the International Astronomical Union, IAU Symposium, vol. 318, pp. 185–192, Bibcode:2016IAUS..318..185W, doi:10.1017/S1743921315008777.
External links[edit]
- 168 Sibylla at AstDyS-2, Asteroids—Dynamic Site
- 168 Sibylla at the JPL Small-Body Database
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