52872 Okyrhoe
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Discovery
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| Discovered by | Spacewatch |
| Discovery date | September 19, 1998 |
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Designations
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| Alternate name(s) | 1998 SG35 |
| Minor planet category |
centaur[1][2][3] |
| Epoch 2008-11-30 (2454800.5) | |
| Aphelion | 10.934 AU |
| Perihelion | 5.799 AU |
| Semi-major axis | 8.366 AU |
| Eccentricity | 0.3068 |
| Orbital period | 24.20 yr |
| Average orbital speed | ? |
| Mean anomaly | 12.55 |
| Inclination | 15.65 |
| Longitude of ascending node | 173.1 |
| Argument of perihelion | 338.0 |
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Physical characteristics
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| Dimensions | 48 km[4] |
| Mass | ? |
| Mean density | ? |
| Equatorial surface gravity | ? |
| Escape velocity | ? |
| Rotation period | 16.6 h[1] |
| Albedo | 0.03[5] |
| Temperature | ? |
| Spectral type | ? |
| Absolute magnitude (H) | 10.8[1] |
52872 Okyrhoe (
/əˈkɪroʊ.iː/; from Greek: Ωκυρόη, Ωκυρρόη) is a centaur orbiting in the outer Solar System between Jupiter and Neptune. It was discovered on September 19, 1998, by Spacewatch.
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[edit] Orbit
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.[6]
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. Recently discovered 2008 QD4 has a smaller perihelion distance.
[edit] Sublimation
Okyrhoe passed perihelion in early 2008,[1] and exhibited important magnitude variations during March and April 2008.[7] This could be a sign of sublimation of volatiles.
[edit] References
- ^ a b c d e "JPL Small-Body Database Browser: 52872 Okyrhoe (1998 SG35)". 2008-06-06 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=52872. Retrieved 2008-10-11.
- ^ a b Marc W. Buie (2008-04-24). "Orbit Fit and Astrometric record for 52872". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/52872.html. Retrieved 2008-10-11.
- ^ a b "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. http://www.minorplanetcenter.org/iau/lists/Centaurs.html. Retrieved 2008-10-16.
- ^ Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved 2008-10-11.
- ^ E. Dotto, M.A. Barucci, C. de Bergh. "Colours and composition of the Centaurs". Osservatorio Astronomico di Roma, Italy. http://google.com/search?q=cache:w2G_oO5mZVcJ:www.roe.ac.uk/~jkd/kbo_proc/dotto.doc+52872+Okyrhoe+albedo&hl=en&ct=clnk&cd=3&gl=us. Retrieved 2008-10-19. (word format)
- ^ 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.
- ^ 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. http://www.cosis.net/abstracts/EPSC2008/00291/EPSC2008-A-00291-1.pdf. Retrieved 2008-10-12.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
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