2015 RY245, also known as o5s13, is a trans-Neptunian object from the scattered disc of the outermost reaches of the Solar System, approximately 78 kilometers in diameter. It was discovered on 9 September 2015, by the Outer Solar System Origins Survey using the Canada–France–Hawaii Telescope at Mauna Kea Observatories, Hawaii, United States.[2]
Discovery[1][2] | |
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Discovered by | OSSOS |
Discovery site | Mauna Kea Obs. |
Discovery date | 9 September 2015 |
Designations | |
MPC designation | 2015 RY245 |
Alternative designations | o5s13[3] |
Minor planet category | TNO[1] · SDO[4] |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 5 | |
Observation arc | 1.47 yr (538 days) |
Aphelion | 411.25 AU |
Perihelion | 31.276 AU |
Semi-major axis | 221.26 AU |
Eccentricity | 0.8586 |
Orbital period (sidereal) | 3291.32 yr (1,202,155 days) |
Mean anomaly | 1.6973° |
Mean motion | 0° 0m 1.08s / day |
Inclination | 6.0347° |
Longitude of ascending node | 341.55° |
Argument of perihelion | 354.30° |
Physical characteristics | |
Dimensions | 78 km[4] |
Apparent magnitude | 24.6 |
Absolute magnitude (H) | 9.0683[1] |
It is one a small number of detached objects with perihelion distances of 30 AUs or more, and semi-major axes of 200 AU or more.[5] Such objects can not reach such orbits without some perturbing object, which lead to the speculation of planet nine.
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