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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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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.
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.
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