168 Sibylla

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168 Sibylla
168 Sibylla.png
Lightcurve-base 3D-model of 168 Sibylla.
Discovery [1]
Discovered by J. C. Watson
Discovery site Ann Arbor
Discovery date28 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

    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. 1 2 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. 1 2 3 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.
    6. 1 2 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.
    7. ↑ Schmadel, Lutz (2003), Dictionary of Minor Planet Names, Physics and astronomy online library, vol. 1, Springer Science & Business Media, p. 30, ISBN   9783540002383.
    8. ↑ 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 .


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