168 Sibylla

168 Sibylla
Discovery
Discovered by	J. C. Watson
Discovery site	Ann Arbor
Discovery date	28 September 1876
Designations
MPC designation	(168) Sibylla
Pronunciation	/sɪˈbɪlə/
Minor planet category	main-belt
Adjectives	Sibyllian /sɪˈbɪliən/
Orbital characteristics
	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 (sidereal)	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; 149.06 ± 4.29 km
Mass	(3.92 ± 1.80) × 1018 kg
Mean density	2.26 ± 1.05 g/cm3
Synodic rotation period	47.009 h (1.9587 d)
Sidereal rotation period	23.82 hours
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 (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, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
^ ^a ^b di Martino, M.; et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus, vol. 107, no. 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

This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[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.)

[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, vol. 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, vol. 107, no. 2, pp. 269–275, Bibcode:1994Icar..107..269D, doi:10.1006/icar.1994.1022.

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