168 Sibylla

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168 Sibylla
Discovery[1]
Discovered by J. C. Watson
Discovery site Ann Arbor
Discovery date 28 September 1876
Orbital characteristics[2][3]
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)
16.19 km/s
171.517°
0° 9m 30.564s / day
Inclination 4.6617°
205.959°
173.920°
Earth MOID 2.14278 AU (320.555 Gm)
Jupiter MOID 1.8199 AU (272.25 Gm)
Jupiter Tisserand parameter 3.142
Physical characteristics
Dimensions 148.39±4.0 km[2]
149.06 ± 4.29 km[4]
Mass (3.92 ± 1.80) × 1018 kg[4]
Mean density
2.26 ± 1.05 g/cm3[4]
47.009 h (1.9587 d)
23.82 hours[5]
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. 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.[5]

References[edit]

  1. ^ "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". Retrieved August 14, 2012. 
  2. ^ a b Yeomans, Donald K., "168 Sibylla", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016. 
  3. ^ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory. Retrieved August 14, 2012. 
  4. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336free to read, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  5. ^ a b 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[edit]