168 Sibylla

168 Sibylla
Orbital diagram
Discovery[1]
Discovered byJ. C. Watson
Discovery siteAnn Arbor
Discovery date28 September 1876
Designations
(168) Sibylla
Pronunciation/sɪˈbɪlə/[2]
Named after
Sibyls
A876 SA; 1911 HF;
1949 MO
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

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]

  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. ^ a b Cite error: The named reference JPL was invoked but never defined (see the help page).
  4. ^ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory. Retrieved 14 August 2012.
  5. ^ a b c Cite error: The named reference Carry2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference diMartino1994 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Schmadel2003 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Wang_et_al_2016 was invoked but never defined (see the help page).