52872 Okyrhoe

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52872 Okyrhoe
Discovery
Discovered by Spacewatch
Discovery date September 19, 1998
Designations
1998 SG35
Minor planet category centaur[1][2][3]
Orbital characteristics
Epoch 2008-11-30 (2454800.5)
Aphelion 10.934 AU
Perihelion 5.799 AU
8.366 AU
Eccentricity 0.3068
24.20 yr
12.55
Inclination 15.65
173.1
338.0
Physical characteristics
Dimensions 49 km[4]
8.3 h[5]
Albedo 0.03[6]
10.8[1]

52872 Okyrhoe (/əˈkɪr./; from Greek: Ωκυρόη, Ωκυρρόη) is a centaur orbiting in the outer Solar System between Jupiter and Saturn. It was discovered on September 19, 1998, by Spacewatch.

Orbit[edit]

Centaurs have short dynamical lives due to strong interactions with the giant planets. Okyrhoe (1998 SG35) is estimated to have an orbital half-life of about 670 kiloannum.[7]

Of objects listed as a centaur by the Minor Planet Center (MPC),[3] JPL,[1] and the Deep Ecliptic Survey (DES),[2] Okyrhoe has the second smallest perihelion distance of a numbered centaur. Numbered centaur (315898) 2008 QD4 has a smaller perihelion distance.

52872 Okyrhoe passed perihelion in early 2008 and brightened noticeably.

Sublimation[edit]

Okyrhoe passed perihelion in early 2008,[1] and exhibited important magnitude variations during March and April 2008.[8] This could be a sign of sublimation of volatiles.

References[edit]

  1. ^ a b c d "JPL Small-Body Database Browser: 52872 Okyrhoe (1998 SG35)" (last observation: 2008-06-06). Retrieved 2008-10-11. 
  2. ^ a b Marc W. Buie. "Orbit Fit and Astrometric record for 52872" (last observation: 2008-04-24). SwRI (Space Science Department). Retrieved 2008-10-11. 
  3. ^ a b "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2008-10-16. 
  4. ^ Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2012-05-10. 
  5. ^ Bauer, J. M.; Meech, K. J.; Fernandez, Y. R.; Pittichova, J.; Hainaut, O. R.; Boehnhardt, H.; Delsanti, A. C. (2003). "Physical Survey of 24 Centaurs with Visible Photometry". Icarus 166 (1): 195–211. Bibcode:2003Icar..166..195B. doi:10.1016/j.icarus.2003.07.004. 
  6. ^ E. Dotto, M.A. Barucci, C. de Bergh. "Colours and composition of the Centaurs". Osservatorio Astronomico di Roma, Italy. Retrieved 2008-10-19.  (word format)
  7. ^ Horner, J.; Evans, N.W.; Bailey, M. E. (2004). "Simulations of the Population of Centaurs I: The Bulk Statistics". Monthly Notices of the Royal Astronomical Society 354 (3): 798. arXiv:astro-ph/0407400. Bibcode:2004MNRAS.354..798H. doi:10.1111/j.1365-2966.2004.08240.x. 
  8. ^ Trigo-Rodríguez, Melendo, García-Hernández, Davidsson, Sánchez (2008). "A continuous follow-up of Centaurs, and dormant comets: looking for cometary activity." (PDF). European Planetary Science Congress. Retrieved 2008-10-12. 

External links[edit]