Astronomy:168 Sibylla

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Short description: Outer main-belt asteroid
168 Sibylla
Орбита астероида 168.png
Orbital diagram
Discovery[1]
Discovered byJ. C. Watson
Discovery siteAnn Arbor
Discovery date28 September 1876
Designations
(168) Sibylla
Pronunciation/sɪˈbɪlə/[2]
Named afterSibyls
A876 SA; 1911 HF;
1949 MO
Minor planet categorymain-belt
AdjectivesSibyllian /sɪˈbɪliən/
Orbital characteristics[3][4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc136.01 yr (49676 d)
|{{{apsis}}}|helion}}3.6215 astronomical unit|AU (541.77 Gm)
|{{{apsis}}}|helion}}3.1417 AU (469.99 Gm)
3.3816 AU (505.88 Gm)
Eccentricity0.070943
Orbital period6.22 yr (2271.4 d)
Average Orbital speed16.19 km/s
Mean anomaly171.517°
Mean motion0° 9m 30.564s / day
Inclination4.6617°
Longitude of ascending node205.959°
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 density2.26 ± 1.05 g/cm3[5]
Rotation period47.009 h (1.9587 d)
Sidereal rotation period23.82 hours[6]
Geometric albedo0.0535±0.003
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. 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)". https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html. Retrieved August 14, 2012. 
  2. Sibylla (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Sibylla  (Subscription or UK public library membership required.)
  3. 3.0 3.1 Yeomans, Donald K., "168 Sibylla", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=168, retrieved 12 May 2016. 
  4. "The Asteroid Orbital Elements Database". Lowell Observatory. http://ftp.lowell.edu/pub/elgb/astorb.html. Retrieved August 14, 2012. 
  5. 5.0 5.1 5.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode2012P&SS...73...98C.  See Table 1.
  6. 6.0 6.1 di Martino, M. et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus 107 (2): 269–275, doi:10.1006/icar.1994.1022, Bibcode1994Icar..107..269D. 
  7. Schmadel, Lutz (2003), Dictionary of Minor Planet Names, Physics and astronomy online library, 1, Springer Science & Business Media, p. 30, ISBN 9783540002383, https://books.google.com/books?id=VoJ5nUyIzCsC&pg=PA30. 
  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 318: pp. 185–192, doi:10.1017/S1743921315008777, Bibcode2016IAUS..318..185W. 

External links