168 Sibylla

168 Sibylla
Discovery[1]
Discovered by	J. C. Watson
Discovery site	Ann Arbor
Discovery date	28 September 1876
Designations
MPC designation	(168) Sibylla
Pronunciation	/sɪˈbɪlə/[2]
Minor planet category	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)
Semi-major axis	3.3816 AU (505.88 Gm)
Eccentricity	0.070943
Orbital period	6.22 yr (2271.4 d)
Average orbital speed	16.19 km/s
Mean anomaly	171.517°
Mean motion	0° 9m 30.564s / day
Inclination	4.6617°
Longitude of ascending node	205.959°
Argument of perihelion	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]
Rotation period	47.009 h (1.9587 d)
Sidereal rotation period	23.82 hours[6]
Geometric albedo	0.0535±0.003
Spectral type	C
Absolute magnitude (H)	7.94

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.[6]

References

"Discovery Circumstances: Numbered Minor Planets (1)-(5000)". Retrieved 14 August 2012.
"Sibylla". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
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.
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.
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.

External links

168 Sibylla at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
168 Sibylla at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". Retrieved 14 August 2012.

[2] "Sibylla". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)

[JPL-3] Yeomans, Donald K., "168 Sibylla", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.

[lowell-4] "The Asteroid Orbital Elements Database". astorb. Lowell Observatory. Retrieved 14 August 2012.

[Carry2012-5] 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.

[diMartino1994-6] 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.