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52872 Okyrhoe /oʊˈkɪroʊ.iː/ is a centaur orbiting in the outer Solar System between Jupiter and Saturn. It was discovered on 19 September 1998, by the Spacewatch survey at Kitt Peak Observatory in Arizona, United States, and named after Ocyrhoe from Greek mythology.

52872 Okyrhoe
Discovery
Discovered bySpacewatch
Discovery siteKitt Peak Obs.
Discovery date19 September 1998
Designations
MPC designation
(52872) Okyrhoe
Pronunciation/oʊˈkɪroʊ.iː/[1]
Named after
Ωκυρόη, Ωκυρρόη Ōkyroē, Ōkyrroē
Alternative designations
1998 SG35
Minor planet category
centaur[2][3][4]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc5393 days (14.77 yr)
Aphelion10.908 AU (1.6318 Tm)
Perihelion5.7875 AU (865.80 Gm)
Semi-major axis
8.3478 AU (1.24881 Tm)
Eccentricity0.30670
Orbital period (sidereal)
24.12 yr (8809.66 d)
Mean anomaly
118.92°
Mean motion
0° 2m 27.11s / day
Inclination15.665°
Longitude of ascending node
173.03°
Argument of perihelion
337.79°
Jupiter MOID0.468729 AU (70.1209 Gm)
TJupiter2.945
Physical characteristics
Mean diameter
49 km[5]
Synodic rotation period
8.3 h[6]
Geometric albedo
0.03[7]
Spectral type
B–V = 0.743±0.065[8]
Absolute magnitude (H)
10.8[2]

    Orbit and classification


    Centaurs have short dynamical lives due to strong interactions with the giant planets. Okyrhoe is estimated to have an orbital half-life of about 670 thousand years.[9] Of objects listed as a centaur by the Minor Planet Center (MPC),[4] JPL,[2] and the Deep Ecliptic Survey (DES),[3] 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.
    52872 Okyrhoe passed perihelion in early 2008 and brightened noticeably.

    Naming


    It was named after Ocyrhoe, the daughter of Chiron and Chariclo from Greek mythology.


    Physical characteristics



    Sublimation


    Okyrhoe passed perihelion in early 2008,[2] and exhibited significant magnitude variations during March and April 2008.[10] This could be a sign of sublimation of volatiles.


    See also



    References


    1. 'Ocyroe' in Noah Webster (1884) A Practical Dictionary of the English Language
    2. "JPL Small-Body Database Browser: 52872 Okyrhoe (1998 SG35)" (last observation: 2008-06-06). Retrieved 12 April 2016.
    3. Marc W. Buie. "Orbit Fit and Astrometric record for 52872" (last observation: 2008-04-24). SwRI (Space Science Department). Retrieved 11 October 2008.
    4. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 16 October 2008.
    5. Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 10 May 2012.
    6. 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.
    7. E. Dotto; M.A. Barucci; C. de Bergh. "Colours and composition of the Centaurs". Osservatorio Astronomico di Roma, Italy. Retrieved 19 October 2008. (word format)
    8. Hainaut, O. R.; Boehnhardt, H.; Protopapa, S. (October 2012). "Colours of minor bodies in the outer solar system. II. A statistical analysis revisited". Astronomy and Astrophysics. 546: 20. arXiv:1209.1896. Bibcode:2012A&A...546A.115H. doi:10.1051/0004-6361/201219566. S2CID 54776793. Retrieved 26 September 2019.
    9. 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. S2CID 16002759.
    10. Trigo-Rodríguez; Melendo; García-Hernández; Davidsson; Sánchez; Rodríguez (2008). "A continuous follow-up of Centaurs, and dormant comets: looking for cometary activity" (PDF). European Planetary Science Congress. Retrieved 12 October 2008.



    На других языках

    [de] (52872) Okyrhoe

    (52872) Okyrhoe ist ein Planetoid, der am 19. September 1998 im Rahmen des Spacewatch-Programmes entdeckt wurde und zur Gruppe der Zentauren gehört. Der Asteroid läuft auf einer mäßig exzentrischen Bahn in gut 24 Jahren um die Sonne. Die Bahnexzentrizität seiner Bahn beträgt 0,306, wobei diese 15,67° gegen die Ekliptik geneigt ist.
    - [en] 52872 Okyrhoe

    [fr] (52872) Ocyrhoé

    (55576) Ocyrhoé, désignation internationale (55576) Okyrhoe, est un centaure de magnitude absolue 10,8.

    [ru] (52872) Окироя

    (52872) Окироя (др.-греч. Ὠκυρ(ρ)όη) — астероид группы кентавров[5], который был открыт 19 сентября 1998 года в рамках проекта университета Аризоны по изучению комет и астероидов Spacewatch в обсерватории Китт-Пик и назван в честь Окирои, дочери кентавра Хирона согласно древнегреческой мифологии.


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