168 Sibylla

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.

168 Sibylla
Discovery[1]
Discovered byJ. C. Watson
Discovery siteAnn Arbor
Discovery date28 September 1876
Designations
(168) Sibylla
Pronunciation/sɪˈbɪlə/[2]
main-belt
AdjectivesSibyllian /sɪˈbɪliən/
Orbital characteristics[3][4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc136.01 yr (49676 d)
Aphelion3.6215 AU (541.77 Gm)
Perihelion3.1417 AU (469.99 Gm)
3.3816 AU (505.88 Gm)
Eccentricity0.070943
6.22 yr (2271.4 d)
16.19 km/s
171.517°
0° 9m 30.564s / day
Inclination4.6617°
205.959°
173.920°
Physical characteristics
Dimensions148.39±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

    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]

    References

    1. "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". Retrieved 14 August 2012.
    2. "Sibylla". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    3. Yeomans, Donald K., "168 Sibylla", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    4. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory. Retrieved 14 August 2012.
    5. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    6. di Martino, M.; et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus, 107 (2), pp. 269–275, Bibcode:1994Icar..107..269D, doi:10.1006/icar.1994.1022.


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